import pytest
from tjnetwork import *

class TestApi:
    def enter(self, p):
        if is_project_open(p):
            close_project(p)

        if have_project(p):
            delete_project(p)

        create_project(p)
        open_project(p)


    def leave(self, p):
        close_project(p)
        delete_project(p)


    def test_project(self):
        p = 'test_project'

        assert not have_project(p)
        assert not is_project_open(p)
        assert get_project_open_count(p) == 0

        create_project(p)

        assert have_project(p)
        assert not is_project_open(p)
        assert get_project_open_count(p) == 0

        open_project(p)

        assert have_project(p)
        assert is_project_open(p)
        assert get_project_open_count(p) == 1

        open_project(p)

        assert have_project(p)
        assert is_project_open(p)
        assert get_project_open_count(p) == 2

        close_project(p)

        assert have_project(p)
        assert is_project_open(p)
        assert get_project_open_count(p) == 1

        close_project(p)
        
        assert have_project(p)
        assert not is_project_open(p)
        assert get_project_open_count(p) == 0

        delete_project(p)

        assert not have_project(p)
        assert not is_project_open(p)
        assert get_project_open_count(p) == 0


    def test_title(self):
        p = 'test_title'
        self.enter(p)

        assert get_title(p)['value'] == ''

        change = set_title(p, ChangeSet({'value': 'title'})).operations[0]
        assert change['operation'] == 'update'
        assert change['type'] == 'title'
        assert get_title(p)['value'] == 'title'

        set_title(p, ChangeSet({'value': 'test'}))
        assert get_title(p)['value'] == 'test'

        self.leave(p)


    def test_title_op(self):
        p = 'test_title_op'
        self.enter(p)

        assert get_title(p)['value'] == ''

        cs = set_title(p, ChangeSet({'value': 'title'})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == 'title'
        assert cs['value'] == 'title'
        assert get_title(p)['value'] == 'title'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == 'title'
        assert cs['value'] == ''
        assert get_title(p)['value'] == ''

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == 'title'
        assert cs['value'] == 'title'
        assert get_title(p)['value'] == 'title'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == 'title'
        assert cs['value'] == ''
        assert get_title(p)['value'] == ''

        cs = execute_redo(p)
        assert len(cs.operations) == 0
        assert get_title(p)['value'] == ''

        self.leave(p)


    def test_junction(self):
        p = 'test_junction'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j0', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        j0 = get_junction(p, 'j0')
        assert j0['x'] == 0.0
        assert j0['y'] == 10.0
        assert j0['elevation'] == 20.0
        assert j0['demand'] == None
        assert j0['pattern'] == None
        assert j0['links'] == []

        set_junction(p, ChangeSet({'id': 'j0', 'x': 100.0, 'y': 200.0}))
        j0 = get_junction(p, 'j0')
        assert j0['x'] == 100.0
        assert j0['y'] == 200.0

        set_junction(p, ChangeSet({'id': 'j0', 'elevation': 100.0}))
        j0 = get_junction(p, 'j0')
        assert j0['elevation'] == 100.0

        set_junction(p, ChangeSet({'id': 'j0', 'demand': 100.0}))
        j0 = get_junction(p, 'j0')
        assert j0['demand'] == 100.0

        # TODO: pattern

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        nodes = get_nodes(p)
        assert len(nodes) == 2
        assert nodes[0] == 'j0'
        assert nodes[1] == 'j1'
        assert is_junction(p, 'j0')
        assert is_junction(p, 'j1')

        delete_junction(p, ChangeSet({'id': 'j1'}))
        nodes = get_nodes(p)
        assert len(nodes) == 1
        assert nodes[0] == 'j0'

        delete_junction(p, ChangeSet({'id': 'j0'}))
        nodes = get_nodes(p)
        assert len(nodes) == 0

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_pipe(p, ChangeSet({'id': 'p1', 'node1': 'j1', 'node2': 'j2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))
        add_pump(p, ChangeSet({'id': 'p2', 'node1': 'j1', 'node2': 'j2', 'power': 0.0}))
        add_valve(p, ChangeSet({'id': 'v1', 'node1': 'j2', 'node2': 'j3', 'diameter': 10.0, 'v_type': VALVES_TYPE_FCV, 'setting': 0.1, 'minor_loss': 0.5 }))
        assert get_junction(p, 'j1')['links'] == ['p1', 'p2']
        assert get_junction(p, 'j2')['links'] == ['p1', 'p2', 'v1']
        assert get_junction(p, 'j3')['links'] == ['v1']

        self.leave(p)

    
    def test_junction_op(self):
        p = 'test_junction_op'
        self.enter(p)

        cs = add_junction(p, ChangeSet({'id': 'j0', 'x': 0.0, 'y': 10.0, 'elevation': 20.0})).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['demand'] == None
        assert cs['pattern'] == None

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['demand'] == None
        assert cs['pattern'] == None

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        nodes = get_nodes(p)
        assert len(nodes) == 0

        add_junction(p, ChangeSet({'id': 'j0', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'demand': 100.0}))

        nodes = get_nodes(p)
        assert len(nodes) == 1

        cs = delete_junction(p, ChangeSet({'id': 'j0'})).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['demand'] == 100.0
        assert cs['pattern'] == None

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['demand'] == 100.0
        assert cs['pattern'] == None

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        nodes = get_nodes(p)
        assert len(nodes) == 1

        cs = set_junction(p, ChangeSet({'id': 'j0', 'x': 100.0, 'y': 200.0})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'
        assert cs['x'] == 100.0
        assert cs['y'] == 200.0
        assert cs['elevation'] == 20.0
        assert cs['demand'] == 100.0
        assert cs['pattern'] == None

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == JUNCTION
        assert cs['id'] == 'j0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['demand'] == 100.0
        assert cs['pattern'] == None

        self.leave(p)


    def test_reservoir(self):
        p = 'test_reservoir'
        self.enter(p)

        add_reservoir(p, ChangeSet({'id': 'r0', 'x': 0.0, 'y': 10.0, 'head': 20.0}))
        r0 = get_reservoir(p, 'r0')
        assert r0['x'] == 0.0
        assert r0['y'] == 10.0
        assert r0['head'] == 20.0
        assert r0['pattern'] == None
        assert r0['links'] == []

        set_reservoir(p, ChangeSet({'id': 'r0', 'x': 100.0, 'y': 200.0}))
        r0 = get_reservoir(p, 'r0')
        assert r0['x'] == 100.0
        assert r0['y'] == 200.0

        set_reservoir(p, ChangeSet({'id': 'r0', 'head': 100.0}))
        r0 = get_reservoir(p, 'r0')
        assert r0['head'] == 100.0

        # TODO: pattern

        add_reservoir(p, ChangeSet({'id': 'r1', 'x': 0.0, 'y': 10.0, 'head': 20.0}))
        nodes = get_nodes(p)
        assert len(nodes) == 2
        assert nodes[0] == 'r0'
        assert nodes[1] == 'r1'
        assert is_reservoir(p, 'r0')
        assert is_reservoir(p, 'r1')

        delete_reservoir(p, ChangeSet({'id': 'r1'}))
        nodes = get_nodes(p)
        assert len(nodes) == 1
        assert nodes[0] == 'r0'

        delete_reservoir(p, ChangeSet({'id': 'r0'}))
        nodes = get_nodes(p)
        assert len(nodes) == 0

        add_reservoir(p, ChangeSet({'id': 'r1', 'x': 0.0, 'y': 10.0, 'head': 20.0}))
        add_reservoir(p, ChangeSet({'id': 'r2', 'x': 0.0, 'y': 10.0, 'head': 20.0}))
        add_reservoir(p, ChangeSet({'id': 'r3', 'x': 0.0, 'y': 10.0, 'head': 20.0}))
        add_pipe(p, ChangeSet({'id': 'p1', 'node1': 'r1', 'node2': 'r2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))
        add_pump(p, ChangeSet({'id': 'p2', 'node1': 'r1', 'node2': 'r2', 'power': 0.0}))
        add_valve(p, ChangeSet({'id': 'v1', 'node1': 'r2', 'node2': 'r3', 'diameter': 10.0, 'v_type': VALVES_TYPE_FCV, 'setting': 0.1, 'minor_loss': 0.5 }))
        assert get_reservoir(p, 'r1')['links'] == ['p1', 'p2']
        assert get_reservoir(p, 'r2')['links'] == ['p1', 'p2', 'v1']
        assert get_reservoir(p, 'r3')['links'] == ['v1']

        self.leave(p)


    def test_reservoir_op(self):
        p = 'test_reservoir_op'
        self.enter(p)

        cs = add_reservoir(p, ChangeSet({'id': 'r0', 'x': 0.0, 'y': 10.0, 'head': 20.0})).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['head'] == 20.0
        assert cs['pattern'] == None

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['head'] == 20.0
        assert cs['pattern'] == None

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        nodes = get_nodes(p)
        assert len(nodes) == 0

        add_reservoir(p, ChangeSet({'id': 'r0', 'x': 0.0, 'y': 10.0, 'head': 20.0}))

        nodes = get_nodes(p)
        assert len(nodes) == 1

        cs = delete_reservoir(p, ChangeSet({'id': 'r0'})).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['head'] == 20.0
        assert cs['pattern'] == None

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['head'] == 20.0
        assert cs['pattern'] == None

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        nodes = get_nodes(p)
        assert len(nodes) == 1

        cs = set_reservoir(p, ChangeSet({'id': 'r0', 'x': 100.0, 'y': 200.0})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'
        assert cs['x'] == 100.0
        assert cs['y'] == 200.0
        assert cs['head'] == 20.0
        assert cs['pattern'] == None

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == RESERVOIR
        assert cs['id'] == 'r0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['head'] == 20.0
        assert cs['pattern'] == None

        self.leave(p)


    def test_tank(self):
        p = 'test_tank'
        self.enter(p)

        add_tank(p, ChangeSet({'id': 't0', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO}))
        t0 = get_tank(p, 't0')
        assert t0['x'] == 0.0
        assert t0['y'] == 10.0
        assert t0['elevation'] == 20.0
        assert t0['init_level'] == 1.0
        assert t0['min_level'] == 0.0
        assert t0['max_level'] == 2.0
        assert t0['diameter'] == 10.0
        assert t0['min_vol'] == 100.0
        assert t0['vol_curve'] == None
        assert t0['overflow'] == OVERFLOW_NO
        assert t0['links'] == []

        set_tank(p, ChangeSet({'id': 't0', 'x': 100.0, 'y': 200.0}))
        t0 = get_tank(p, 't0')
        assert t0['x'] == 100.0
        assert t0['y'] == 200.0

        set_tank(p, ChangeSet({'id': 't0', 'elevation': 100.0}))
        t0 = get_tank(p, 't0')
        assert t0['elevation'] == 100.0

        set_tank(p, ChangeSet({'id': 't0', 'init_level': 100.0, 'min_level': 50.0, 'max_level': 200.0}))
        t0 = get_tank(p, 't0')
        assert t0['init_level'] == 100.0
        assert t0['min_level'] == 50.0
        assert t0['max_level'] == 200.0

        set_tank(p, ChangeSet({'id': 't0', 'diameter': 100.0}))
        t0 = get_tank(p, 't0')
        assert t0['diameter'] == 100.0

        set_tank(p, ChangeSet({'id': 't0', 'min_vol': 200.0}))
        t0 = get_tank(p, 't0')
        assert t0['min_vol'] == 200.0

        # TODO: vol_curve

        set_tank(p, ChangeSet({'id': 't0', 'overflow': OVERFLOW_YES}))
        t0 = get_tank(p, 't0')
        assert t0['overflow'] == OVERFLOW_YES

        add_tank(p, ChangeSet({'id': 't1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO}))
        nodes = get_nodes(p)
        assert len(nodes) == 2
        assert nodes[0] == 't0'
        assert nodes[1] == 't1'
        assert is_tank(p, 't0')
        assert is_tank(p, 't1')

        delete_tank(p, ChangeSet({'id': 't1'}))
        nodes = get_nodes(p)
        assert len(nodes) == 1
        assert nodes[0] == 't0'

        delete_tank(p, ChangeSet({'id': 't0'}))
        nodes = get_nodes(p)
        assert len(nodes) == 0

        add_tank(p, ChangeSet({'id': 't1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO}))
        add_tank(p, ChangeSet({'id': 't2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO}))
        add_tank(p, ChangeSet({'id': 't3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO}))
        add_pipe(p, ChangeSet({'id': 'p1', 'node1': 't1', 'node2': 't2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))
        add_pump(p, ChangeSet({'id': 'p2', 'node1': 't1', 'node2': 't2', 'power': 0.0}))
        add_valve(p, ChangeSet({'id': 'v1', 'node1': 't2', 'node2': 't3', 'diameter': 10.0, 'v_type': VALVES_TYPE_FCV, 'setting': 0.1, 'minor_loss': 0.5 }))
        assert get_tank(p, 't1')['links'] == ['p1', 'p2']
        assert get_tank(p, 't2')['links'] == ['p1', 'p2', 'v1']
        assert get_tank(p, 't3')['links'] == ['v1']

        self.leave(p)


    def test_tank_op(self):
        p = 'test_tank_op'
        self.enter(p)

        cs = add_tank(p, ChangeSet({'id': 't0', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO})).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['init_level'] == 1.0
        assert cs['min_level'] == 0.0
        assert cs['max_level'] == 2.0
        assert cs['diameter'] == 10.0
        assert cs['min_vol'] == 100.0
        assert cs['vol_curve'] == None
        assert cs['overflow'] == OVERFLOW_NO

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['init_level'] == 1.0
        assert cs['min_level'] == 0.0
        assert cs['max_level'] == 2.0
        assert cs['diameter'] == 10.0
        assert cs['min_vol'] == 100.0
        assert cs['vol_curve'] == None
        assert cs['overflow'] == OVERFLOW_NO

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        nodes = get_nodes(p)
        assert len(nodes) == 0

        add_tank(p, ChangeSet({'id': 't0', 'x': 0.0, 'y': 10.0, 'elevation': 20.0, 'init_level': 1.0, 'min_level': 0.0, 'max_level': 2.0, 'diameter': 10.0, 'min_vol': 100.0, 'vol_curve': None, 'overflow': OVERFLOW_NO}))

        nodes = get_nodes(p)
        assert len(nodes) == 1

        cs = delete_tank(p, ChangeSet({'id': 't0'})).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['init_level'] == 1.0
        assert cs['min_level'] == 0.0
        assert cs['max_level'] == 2.0
        assert cs['diameter'] == 10.0
        assert cs['min_vol'] == 100.0
        assert cs['vol_curve'] == None
        assert cs['overflow'] == OVERFLOW_NO

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['init_level'] == 1.0
        assert cs['min_level'] == 0.0
        assert cs['max_level'] == 2.0
        assert cs['diameter'] == 10.0
        assert cs['min_vol'] == 100.0
        assert cs['vol_curve'] == None
        assert cs['overflow'] == OVERFLOW_NO

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        nodes = get_nodes(p)
        assert len(nodes) == 1

        cs = set_tank(p, ChangeSet({'id': 't0', 'x': 100.0, 'y': 200.0})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'
        assert cs['x'] == 100.0
        assert cs['y'] == 200.0
        assert cs['elevation'] == 20.0
        assert cs['init_level'] == 1.0
        assert cs['min_level'] == 0.0
        assert cs['max_level'] == 2.0
        assert cs['diameter'] == 10.0
        assert cs['min_vol'] == 100.0
        assert cs['vol_curve'] == None
        assert cs['overflow'] == OVERFLOW_NO

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == TANK
        assert cs['id'] == 't0'
        assert cs['x'] == 0.0
        assert cs['y'] == 10.0
        assert cs['elevation'] == 20.0
        assert cs['init_level'] == 1.0
        assert cs['min_level'] == 0.0
        assert cs['max_level'] == 2.0
        assert cs['diameter'] == 10.0
        assert cs['min_vol'] == 100.0
        assert cs['vol_curve'] == None
        assert cs['overflow'] == OVERFLOW_NO

        self.leave(p)


    def test_pipe(self):
        p = 'test_pipe'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j4', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')
        assert is_junction(p, 'j3')
        assert is_junction(p, 'j4')

        add_pipe(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))
        p0 = get_pipe(p, 'p0')
        assert p0['node1'] == 'j1'
        assert p0['node2'] == 'j2'
        assert p0['length'] == 100.0
        assert p0['diameter'] == 10.0
        assert p0['roughness'] == 0.1
        assert p0['minor_loss'] == 0.5
        assert p0['status'] == PIPE_STATUS_OPEN

        set_pipe(p, ChangeSet({'id': 'p0', 'node1': 'j3', 'node2': 'j4'}))
        p0 = get_pipe(p, 'p0')
        assert p0['node1'] == 'j3'
        assert p0['node2'] == 'j4'

        set_pipe(p, ChangeSet({'id': 'p0', 'length': 200.0}))
        p0 = get_pipe(p, 'p0')
        assert p0['length'] == 200.0

        set_pipe(p, ChangeSet({'id': 'p0', 'diameter': 100.0}))
        p0 = get_pipe(p, 'p0')
        assert p0['diameter'] == 100.0

        set_pipe(p, ChangeSet({'id': 'p0', 'roughness': 0.2}))
        p0 = get_pipe(p, 'p0')
        assert p0['roughness'] == 0.2

        set_pipe(p, ChangeSet({'id': 'p0', 'minor_loss': 0.1}))
        p0 = get_pipe(p, 'p0')
        assert p0['minor_loss'] == 0.1

        set_pipe(p, ChangeSet({'id': 'p0', 'status': PIPE_STATUS_CLOSED}))
        p0 = get_pipe(p, 'p0')
        assert p0['status'] == PIPE_STATUS_CLOSED

        add_pipe(p, ChangeSet({'id': 'p1', 'node1': 'j1', 'node2': 'j2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))
        links = get_links(p)
        assert len(links) == 2
        assert links[0] == 'p0'
        assert links[1] == 'p1'
        assert is_pipe(p, 'p0')
        assert is_pipe(p, 'p1')

        delete_pipe(p, ChangeSet({'id': 'p1'}))
        links = get_links(p)
        assert len(links) == 1
        assert links[0] == 'p0'

        delete_pipe(p, ChangeSet({'id': 'p0'}))
        links = get_links(p)
        assert len(links) == 0

        self.leave(p)


    def test_pipe_op(self):
        p = 'test_pipe_op'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j4', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')
        assert is_junction(p, 'j3')
        assert is_junction(p, 'j4')

        cs = add_pipe(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN })).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['length'] == 100.0
        assert cs['diameter'] == 10.0
        assert cs['roughness'] == 0.1
        assert cs['minor_loss'] == 0.5
        assert cs['status'] == PIPE_STATUS_OPEN

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['length'] == 100.0
        assert cs['diameter'] == 10.0
        assert cs['roughness'] == 0.1
        assert cs['minor_loss'] == 0.5
        assert cs['status'] == PIPE_STATUS_OPEN

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        links = get_links(p)
        assert len(links) == 0

        add_pipe(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))

        links = get_links(p)
        assert len(links) == 1

        cs = delete_pipe(p, ChangeSet({'id': 'p0'})).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['length'] == 100.0
        assert cs['diameter'] == 10.0
        assert cs['roughness'] == 0.1
        assert cs['minor_loss'] == 0.5
        assert cs['status'] == PIPE_STATUS_OPEN

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['length'] == 100.0
        assert cs['diameter'] == 10.0
        assert cs['roughness'] == 0.1
        assert cs['minor_loss'] == 0.5
        assert cs['status'] == PIPE_STATUS_OPEN

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        links = get_links(p)
        assert len(links) == 1

        cs = set_pipe(p, ChangeSet({'id': 'p0', 'node1': 'j3', 'node2': 'j4'})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j3'
        assert cs['node2'] == 'j4'
        assert cs['length'] == 100.0
        assert cs['diameter'] == 10.0
        assert cs['roughness'] == 0.1
        assert cs['minor_loss'] == 0.5
        assert cs['status'] == PIPE_STATUS_OPEN

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == PIPE
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['length'] == 100.0
        assert cs['diameter'] == 10.0
        assert cs['roughness'] == 0.1
        assert cs['minor_loss'] == 0.5
        assert cs['status'] == PIPE_STATUS_OPEN

        self.leave(p)


    def test_pump(self):
        p = 'test_pump'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j4', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')
        assert is_junction(p, 'j3')
        assert is_junction(p, 'j4')

        add_pump(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'power': 0.0}))
        p0 = get_pump(p, 'p0')
        assert p0['node1'] == 'j1'
        assert p0['node2'] == 'j2'
        assert p0['power'] == 0.0
        assert p0['head'] == None
        assert p0['speed'] == None
        assert p0['pattern'] == None

        set_pump(p, ChangeSet({'id': 'p0', 'node1': 'j3', 'node2': 'j4'}))
        p0 = get_pump(p, 'p0')
        assert p0['node1'] == 'j3'
        assert p0['node2'] == 'j4'

        set_pump(p, ChangeSet({'id': 'p0', 'power': 100.0}))
        p0 = get_pump(p, 'p0')
        assert p0['power'] == 100.0

        add_pump(p, ChangeSet({'id': 'p1', 'node1': 'j1', 'node2': 'j2', 'power': 0.0}))
        links = get_links(p)
        assert len(links) == 2
        assert links[0] == 'p0'
        assert links[1] == 'p1'
        assert is_pump(p, 'p0')
        assert is_pump(p, 'p1')

        delete_pump(p, ChangeSet({'id': 'p1'}))
        links = get_links(p)
        assert len(links) == 1
        assert links[0] == 'p0'

        delete_pump(p, ChangeSet({'id': 'p0'}))
        links = get_links(p)
        assert len(links) == 0

        self.leave(p)


    def test_pump_op(self):
        p = 'test_pump_op'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j4', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')
        assert is_junction(p, 'j3')
        assert is_junction(p, 'j4')

        cs = add_pump(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'power': 0.0})).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['power'] == 0.0

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        links = get_links(p)
        assert len(links) == 0

        add_pump(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'power': 0.0}))

        links = get_links(p)
        assert len(links) == 1

        cs = delete_pump(p, ChangeSet({'id': 'p0'})).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        links = get_links(p)
        assert len(links) == 1

        cs = set_pump(p, ChangeSet({'id': 'p0', 'node1': 'j3', 'node2': 'j4'})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j3'
        assert cs['node2'] == 'j4'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'

        cs = set_pump(p, ChangeSet({'id': 'p0', 'power': 100.0})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['power'] == 100.0

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == PUMP
        assert cs['id'] == 'p0'
        assert cs['power'] == 0.0

        self.leave(p)


    def test_valve(self):
        p = 'test_valve'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j4', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')
        assert is_junction(p, 'j3')
        assert is_junction(p, 'j4')

        add_valve(p, ChangeSet({'id': 'v0', 'node1': 'j1', 'node2': 'j2', 'diameter': 10.0, 'v_type': VALVES_TYPE_FCV, 'setting': 0.1, 'minor_loss': 0.5 }))
        v0 = get_valve(p, 'v0')
        assert v0['node1'] == 'j1'
        assert v0['node2'] == 'j2'
        assert v0['diameter'] == 10.0
        assert v0['v_type'] == VALVES_TYPE_FCV
        assert v0['setting'] == 0.1
        assert v0['minor_loss'] == 0.5

        set_valve(p, ChangeSet({'id': 'v0', 'node1': 'j3', 'node2': 'j4'}))
        v0 = get_valve(p, 'v0')
        assert v0['node1'] == 'j3'
        assert v0['node2'] == 'j4'

        set_valve(p, ChangeSet({'id': 'v0', 'diameter': 100.0}))
        v0 = get_valve(p, 'v0')
        assert v0['diameter'] == 100.0

        set_valve(p, ChangeSet({'id': 'v0', 'v_type': VALVES_TYPE_GPV}))
        v0 = get_valve(p, 'v0')
        assert v0['v_type'] == VALVES_TYPE_GPV

        set_valve(p, ChangeSet({'id': 'v0', 'setting': 0.2}))
        v0 = get_valve(p, 'v0')
        assert v0['setting'] == 0.2

        set_valve(p, ChangeSet({'id': 'v0', 'minor_loss': 0.1}))
        v0 = get_valve(p, 'v0')
        assert v0['minor_loss'] == 0.1

        add_valve(p, ChangeSet({'id': 'v1', 'node1': 'j1', 'node2': 'j2', 'diameter': 10.0, 'v_type': VALVES_TYPE_FCV, 'setting': 0.1, 'minor_loss': 0.5 }))
        links = get_links(p)
        assert len(links) == 2
        assert links[0] == 'v0'
        assert links[1] == 'v1'
        assert is_valve(p, 'v0')
        assert is_valve(p, 'v1')

        delete_valve(p, ChangeSet({'id': 'v1'}))
        links = get_links(p)
        assert len(links) == 1
        assert links[0] == 'v0'

        delete_valve(p, ChangeSet({'id': 'v0'}))
        links = get_links(p)
        assert len(links) == 0

        self.leave(p)


    def test_valve_op(self):
        p = 'test_valve_op'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j4', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')
        assert is_junction(p, 'j3')
        assert is_junction(p, 'j4')

        cs = add_valve(p, ChangeSet({'id': 'v0', 'node1': 'j1', 'node2': 'j2', 'diameter': 10.0, 'v_type': VALVES_TYPE_FCV, 'setting': 0.1, 'minor_loss': 0.5 })).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['diameter'] == 10.0
        assert cs['v_type'] == VALVES_TYPE_FCV
        assert cs['setting'] == 0.1
        assert cs['minor_loss'] == 0.5

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['diameter'] == 10.0
        assert cs['v_type'] == VALVES_TYPE_FCV
        assert cs['setting'] == 0.1
        assert cs['minor_loss'] == 0.5

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        links = get_links(p)
        assert len(links) == 0

        add_valve(p, ChangeSet({'id': 'v0', 'node1': 'j1', 'node2': 'j2', 'diameter': 10.0, 'v_type': VALVES_TYPE_FCV, 'setting': 0.1, 'minor_loss': 0.5 }))

        links = get_links(p)
        assert len(links) == 1

        cs = delete_valve(p, ChangeSet({'id': 'v0'})).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['diameter'] == 10.0
        assert cs['v_type'] == VALVES_TYPE_FCV
        assert cs['setting'] == 0.1
        assert cs['minor_loss'] == 0.5

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == 'delete'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'

        cs = execute_undo(p, True).operations[0]
        assert cs['operation'] == 'add'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['diameter'] == 10.0
        assert cs['v_type'] == VALVES_TYPE_FCV
        assert cs['setting'] == 0.1
        assert cs['minor_loss'] == 0.5

        cs = execute_redo(p)
        assert len(cs.operations) == 0

        links = get_links(p)
        assert len(links) == 1

        cs = set_valve(p, ChangeSet({'id': 'v0', 'node1': 'j3', 'node2': 'j4'})).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'
        assert cs['node1'] == 'j3'
        assert cs['node2'] == 'j4'
        assert cs['diameter'] == 10.0
        assert cs['v_type'] == VALVES_TYPE_FCV
        assert cs['setting'] == 0.1
        assert cs['minor_loss'] == 0.5

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == 'update'
        assert cs['type'] == VALVE
        assert cs['id'] == 'v0'
        assert cs['node1'] == 'j1'
        assert cs['node2'] == 'j2'
        assert cs['diameter'] == 10.0
        assert cs['v_type'] == VALVES_TYPE_FCV
        assert cs['setting'] == 0.1
        assert cs['minor_loss'] == 0.5

        self.leave(p)


    def test_demand(self):
        p = 'test_demand'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')

        d = get_demand(p, 'j1')
        assert d['junction'] == 'j1'
        assert d['demands'] == []

        set_demand(p, ChangeSet({'junction': 'j1', 'demands': [{'demand': 10.0, 'pattern': None, 'category': 'x'},
                                                               {'demand': 20.0, 'pattern': None, 'category': None}]}))

        d = get_demand(p, 'j1')
        assert d['junction'] == 'j1'
        ds = d['demands']
        assert len(ds) == 2
        assert ds[0]['demand'] == 10.0
        assert ds[0]['pattern'] == None
        assert ds[0]['category'] == 'x'
        assert ds[1]['demand'] == 20.0
        assert ds[1]['pattern'] == None
        assert ds[1]['category'] == None

        set_demand(p, ChangeSet({'junction': 'j1', 'demands': []}))

        d = get_demand(p, 'j1')
        assert d['junction'] == 'j1'
        assert d['demands'] == []

        self.leave(p)


    def test_demand_op(self):
        p = 'test_demand_op'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')

        cs = set_demand(p, ChangeSet({'junction': 'j1', 'demands': [{'demand': 10.0, 'pattern': None, 'category': 'x'},
                                                                    {'demand': 20.0, 'pattern': None, 'category': None}]})).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'demand'
        assert cs['junction'] == 'j1'
        ds = cs['demands']
        assert len(ds) == 2
        assert ds[0]['demand'] == 10.0
        assert ds[0]['pattern'] == None
        assert ds[0]['category'] == 'x'
        assert ds[1]['demand'] == 20.0
        assert ds[1]['pattern'] == None
        assert ds[1]['category'] == None

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'demand'
        assert cs['junction'] == 'j1'
        assert len(cs['demands']) == 0

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'demand'
        assert cs['junction'] == 'j1'
        ds = cs['demands']
        assert len(ds) == 2
        assert ds[0]['demand'] == 10.0
        assert ds[0]['pattern'] == None
        assert ds[0]['category'] == 'x'
        assert ds[1]['demand'] == 20.0
        assert ds[1]['pattern'] == None
        assert ds[1]['category'] == None

        self.leave(p)


    def test_status(self):
        p = 'test_status'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')

        add_pipe(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))
        assert is_pipe(p, 'p0')

        s = get_status(p, 'p0')
        assert s['link'] == 'p0'
        assert s['status'] == None
        assert s['setting'] == None

        set_status(p, ChangeSet({'link': 'p0', 'status': LINK_STATUS_OPEN, 'setting': 10.0}))
        s = get_status(p, 'p0')
        assert s['link'] == 'p0'
        assert s['status'] == LINK_STATUS_OPEN
        assert s['setting'] == 10.0

        set_status(p, ChangeSet({'link': 'p0', 'status': None, 'setting': None}))
        s = get_status(p, 'p0')
        assert s['link'] == 'p0'
        assert s['status'] == None
        assert s['setting'] == None

        self.leave(p)


    def test_status_op(self):
        p = 'test_status_op'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')
        assert is_junction(p, 'j2')

        add_pipe(p, ChangeSet({'id': 'p0', 'node1': 'j1', 'node2': 'j2', 'length': 100.0, 'diameter': 10.0, 'roughness': 0.1, 'minor_loss': 0.5, 'status': PIPE_STATUS_OPEN }))
        assert is_pipe(p, 'p0')

        s = get_status(p, 'p0')
        assert s['link'] == 'p0'
        assert s['status'] == None
        assert s['setting'] == None

        cs = set_status(p, ChangeSet({'link': 'p0', 'status': LINK_STATUS_OPEN, 'setting': 10.0})).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'status'
        assert cs['link'] == 'p0'
        assert cs['status'] == LINK_STATUS_OPEN
        assert cs['setting'] == 10.0

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'status'
        assert cs['link'] == 'p0'
        assert cs['status'] == None
        assert cs['setting'] == None

        s = get_status(p, 'p0')
        assert s['link'] == 'p0'
        assert s['status'] == None
        assert s['setting'] == None

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'status'
        assert cs['link'] == 'p0'
        assert cs['status'] == LINK_STATUS_OPEN
        assert cs['setting'] == 10.0

        self.leave(p)


    def test_pattern(self):
        p = 'test_pattern'
        self.enter(p)

        assert is_pattern(p, 'p0') == False
        p0 = get_pattern(p, 'p0')
        assert p0['id'] == 'p0'
        assert p0['factors'] == []

        set_pattern(p, ChangeSet({'id' : 'p0', 'factors': [1.0, 2.0, 3.0]}))

        assert is_pattern(p, 'p0')
        p0 = get_pattern(p, 'p0')
        assert p0['id'] == 'p0'
        assert p0['factors'] == [1.0, 2.0, 3.0]

        set_pattern(p, ChangeSet({'id' : 'p0', 'factors': []}))

        assert is_pattern(p, 'p0') == False
        p0 = get_pattern(p, 'p0')
        assert p0['id'] == 'p0'
        assert p0['factors'] == []

        self.leave(p)


    def test_pattern_op(self):
        p = 'test_pattern_op'
        self.enter(p)

        cs = set_pattern(p, ChangeSet({'id' : 'p0', 'factors': [1.0, 2.0, 3.0]})).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == PATTERN
        assert cs['id'] == 'p0'
        assert cs['factors'] == [1.0, 2.0, 3.0]

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == PATTERN
        assert cs['id'] == 'p0'
        assert cs['factors'] == []

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == PATTERN
        assert cs['id'] == 'p0'
        assert cs['factors'] == [1.0, 2.0, 3.0]

        self.leave(p)


    def test_curve(self):
        p = 'test_curve'
        self.enter(p)

        assert is_curve(p, 'c0') == False
        c0 = get_curve(p, 'c0')
        assert c0['id'] == 'c0'
        assert c0['coords'] == []

        set_curve(p, ChangeSet({'id' : 'c0', 'coords': [{'x': 1.0, 'y': 2.0}, {'x': 2.0, 'y': 1.0}]}))

        assert is_curve(p, 'c0')
        c0 = get_curve(p, 'c0')
        assert c0['id'] == 'c0'
        xys = c0['coords']
        assert len(xys) == 2
        assert xys[0]['x'] == 1.0
        assert xys[0]['y'] == 2.0
        assert xys[1]['x'] == 2.0
        assert xys[1]['y'] == 1.0

        set_curve(p, ChangeSet({'id' : 'c0', 'coords': []}))

        assert is_curve(p, 'c0') == False
        c0 = get_curve(p, 'c0')
        assert c0['id'] == 'c0'
        assert c0['coords'] == []

        self.leave(p)


    def test_curve_op(self):
        p = 'test_curve_op'
        self.enter(p)

        cs = set_curve(p, ChangeSet({'id' : 'c0', 'coords': [{'x': 1.0, 'y': 2.0}, {'x': 2.0, 'y': 1.0}]})).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == CURVE
        assert cs['id'] == 'c0'
        xys = cs['coords']
        assert len(xys) == 2
        assert xys[0]['x'] == 1.0
        assert xys[0]['y'] == 2.0
        assert xys[1]['x'] == 2.0
        assert xys[1]['y'] == 1.0

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == CURVE
        assert cs['id'] == 'c0'
        assert cs['coords'] == []

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == CURVE
        assert cs['id'] == 'c0'
        xys = cs['coords']
        assert len(xys) == 2
        assert xys[0]['x'] == 1.0
        assert xys[0]['y'] == 2.0
        assert xys[1]['x'] == 2.0
        assert xys[1]['y'] == 1.0

        self.leave(p)


    def test_emitter(self):
        p = 'test_emitter'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')

        e = get_emitter(p, 'j1')
        assert e['junction'] == 'j1'
        assert e['coefficient'] == None

        set_emitter(p, ChangeSet({'junction': 'j1', 'coefficient': 10.0}))

        e = get_emitter(p, 'j1')
        assert e['junction'] == 'j1'
        assert e['coefficient'] == 10.0

        set_emitter(p, ChangeSet({'junction': 'j1', 'coefficient': None}))

        e = get_emitter(p, 'j1')
        assert e['junction'] == 'j1'
        assert e['coefficient'] == None

        self.leave(p)


    def test_emitter_op(self):
        p = 'test_emitter_op'
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        assert is_junction(p, 'j1')

        cs = set_emitter(p, ChangeSet({'junction': 'j1', 'coefficient': 10.0})).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'emitter'
        assert cs['junction'] == 'j1'
        assert cs['coefficient'] == 10.0

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'emitter'
        assert cs['junction'] == 'j1'
        assert cs['coefficient'] == None

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'emitter'
        assert cs['junction'] == 'j1'
        assert cs['coefficient'] == 10.0

        self.leave(p)


    def test_time(self):
        p = 'test_time'
        self.enter(p)

        t = get_time(p)
        assert t['DURATION'] == '0:00'
        assert t['HYDRAULIC TIMESTEP'] == '1:00'
        assert t['QUALITY TIMESTEP'] == '0:05'
        assert t['RULE TIMESTEP'] == '0:05'
        assert t['PATTERN TIMESTEP'] == '1:00'
        assert t['PATTERN START'] == '0:00'
        assert t['REPORT TIMESTEP'] == '1:00'
        assert t['REPORT START'] == '0:00'
        assert t['START CLOCKTIME'] == '12:00 AM'
        assert t['STATISTIC'] == TIME_STATISTIC_NONE

        t['STATISTIC'] = TIME_STATISTIC_AVERAGED
        set_time(p, ChangeSet(t))

        t = get_time(p)
        assert t['DURATION'] == '0:00'
        assert t['HYDRAULIC TIMESTEP'] == '1:00'
        assert t['QUALITY TIMESTEP'] == '0:05'
        assert t['RULE TIMESTEP'] == '0:05'
        assert t['PATTERN TIMESTEP'] == '1:00'
        assert t['PATTERN START'] == '0:00'
        assert t['REPORT TIMESTEP'] == '1:00'
        assert t['REPORT START'] == '0:00'
        assert t['START CLOCKTIME'] == '12:00 AM'
        assert t['STATISTIC'] == TIME_STATISTIC_AVERAGED

        self.leave(p)


    def test_time_op(self):
        p = 'test_time_op'
        self.enter(p)

        t = get_time(p)
        assert t['DURATION'] == '0:00'
        assert t['HYDRAULIC TIMESTEP'] == '1:00'
        assert t['QUALITY TIMESTEP'] == '0:05'
        assert t['RULE TIMESTEP'] == '0:05'
        assert t['PATTERN TIMESTEP'] == '1:00'
        assert t['PATTERN START'] == '0:00'
        assert t['REPORT TIMESTEP'] == '1:00'
        assert t['REPORT START'] == '0:00'
        assert t['START CLOCKTIME'] == '12:00 AM'
        assert t['STATISTIC'] == TIME_STATISTIC_NONE

        t['STATISTIC'] = TIME_STATISTIC_AVERAGED
        cs = set_time(p, ChangeSet(t)).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'time'
        assert cs['DURATION'] == '0:00'
        assert cs['HYDRAULIC TIMESTEP'] == '1:00'
        assert cs['QUALITY TIMESTEP'] == '0:05'
        assert cs['RULE TIMESTEP'] == '0:05'
        assert cs['PATTERN TIMESTEP'] == '1:00'
        assert cs['PATTERN START'] == '0:00'
        assert cs['REPORT TIMESTEP'] == '1:00'
        assert cs['REPORT START'] == '0:00'
        assert cs['START CLOCKTIME'] == '12:00 AM'
        assert cs['STATISTIC'] == TIME_STATISTIC_AVERAGED

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'time'
        assert cs['DURATION'] == '0:00'
        assert cs['HYDRAULIC TIMESTEP'] == '1:00'
        assert cs['QUALITY TIMESTEP'] == '0:05'
        assert cs['RULE TIMESTEP'] == '0:05'
        assert cs['PATTERN TIMESTEP'] == '1:00'
        assert cs['PATTERN START'] == '0:00'
        assert cs['REPORT TIMESTEP'] == '1:00'
        assert cs['REPORT START'] == '0:00'
        assert cs['START CLOCKTIME'] == '12:00 AM'
        assert cs['STATISTIC'] == TIME_STATISTIC_NONE

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'time'
        assert cs['DURATION'] == '0:00'
        assert cs['HYDRAULIC TIMESTEP'] == '1:00'
        assert cs['QUALITY TIMESTEP'] == '0:05'
        assert cs['RULE TIMESTEP'] == '0:05'
        assert cs['PATTERN TIMESTEP'] == '1:00'
        assert cs['PATTERN START'] == '0:00'
        assert cs['REPORT TIMESTEP'] == '1:00'
        assert cs['REPORT START'] == '0:00'
        assert cs['START CLOCKTIME'] == '12:00 AM'
        assert cs['STATISTIC'] == TIME_STATISTIC_AVERAGED

        self.leave(p)


    def test_option(self):
        p = 'test_option'
        self.enter(p)

        o = get_option(p)
        assert o['UNITS'] == OPTION_UNITS_GPM
        assert o['HEADLOSS'] == OPTION_HEADLOSS_HW
        assert o['VISCOSITY'] == '1.0'
        assert o['SPECIFIC GRAVITY'] == '1.0'
        assert o['TRIALS'] == '40'
        assert o['ACCURACY'] == '0.001'
        assert o['FLOWCHANGE'] == '0'
        assert o['HEADERROR'] == '0'
        assert o['CHECKFREQ'] == '2'
        assert o['MAXCHECK'] == '10'
        assert o['DAMPLIMIT'] == '0'
        assert o['UNBALANCED'] == OPTION_UNBALANCED_STOP
        assert o['DEMAND MODEL'] == OPTION_DEMAND_MODEL_DDA
        assert o['MINIMUM PRESSURE'] == '0'
        assert o['REQUIRED PRESSURE'] == '0.1'
        assert o['PRESSURE EXPONENT'] == '0.5'
        assert o['PATTERN'] == '1'
        assert o['DEMAND MULTIPLIER'] == '1.0'
        assert o['EMITTER EXPONENT'] == '0.5'
        assert o['QUALITY'] == OPTION_QUALITY_NONE
        assert o['DIFFUSIVITY'] == '1.0'
        assert o['TOLERANCE'] == '0.01'

        o['UNITS'] = OPTION_UNITS_LPS
        set_option(p, ChangeSet(o))

        o = get_option(p)
        assert o['UNITS'] == OPTION_UNITS_LPS
        assert o['HEADLOSS'] == OPTION_HEADLOSS_HW
        assert o['VISCOSITY'] == '1.0'
        assert o['SPECIFIC GRAVITY'] == '1.0'
        assert o['TRIALS'] == '40'
        assert o['ACCURACY'] == '0.001'
        assert o['FLOWCHANGE'] == '0'
        assert o['HEADERROR'] == '0'
        assert o['CHECKFREQ'] == '2'
        assert o['MAXCHECK'] == '10'
        assert o['DAMPLIMIT'] == '0'
        assert o['UNBALANCED'] == OPTION_UNBALANCED_STOP
        assert o['DEMAND MODEL'] == OPTION_DEMAND_MODEL_DDA
        assert o['MINIMUM PRESSURE'] == '0'
        assert o['REQUIRED PRESSURE'] == '0.1'
        assert o['PRESSURE EXPONENT'] == '0.5'
        assert o['PATTERN'] == '1'
        assert o['DEMAND MULTIPLIER'] == '1.0'
        assert o['EMITTER EXPONENT'] == '0.5'
        assert o['QUALITY'] == OPTION_QUALITY_NONE
        assert o['DIFFUSIVITY'] == '1.0'
        assert o['TOLERANCE'] == '0.01'

        self.leave(p)


    def test_option_op(self):
        p = 'test_option_op'
        self.enter(p)

        o = get_option(p)
        assert o['UNITS'] == OPTION_UNITS_GPM
        assert o['HEADLOSS'] == OPTION_HEADLOSS_HW
        assert o['VISCOSITY'] == '1.0'
        assert o['SPECIFIC GRAVITY'] == '1.0'
        assert o['TRIALS'] == '40'
        assert o['ACCURACY'] == '0.001'
        assert o['FLOWCHANGE'] == '0'
        assert o['HEADERROR'] == '0'
        assert o['CHECKFREQ'] == '2'
        assert o['MAXCHECK'] == '10'
        assert o['DAMPLIMIT'] == '0'
        assert o['UNBALANCED'] == OPTION_UNBALANCED_STOP
        assert o['DEMAND MODEL'] == OPTION_DEMAND_MODEL_DDA
        assert o['MINIMUM PRESSURE'] == '0'
        assert o['REQUIRED PRESSURE'] == '0.1'
        assert o['PRESSURE EXPONENT'] == '0.5'
        assert o['PATTERN'] == '1'
        assert o['DEMAND MULTIPLIER'] == '1.0'
        assert o['EMITTER EXPONENT'] == '0.5'
        assert o['QUALITY'] == OPTION_QUALITY_NONE
        assert o['DIFFUSIVITY'] == '1.0'
        assert o['TOLERANCE'] == '0.01'

        o['UNITS'] = OPTION_UNITS_LPS
        cs = set_option(p, ChangeSet(o)).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'option'
        assert cs['UNITS'] == OPTION_UNITS_LPS
        assert cs['HEADLOSS'] == OPTION_HEADLOSS_HW
        assert cs['VISCOSITY'] == '1.0'
        assert cs['SPECIFIC GRAVITY'] == '1.0'
        assert cs['TRIALS'] == '40'
        assert cs['ACCURACY'] == '0.001'
        assert cs['FLOWCHANGE'] == '0'
        assert cs['HEADERROR'] == '0'
        assert cs['CHECKFREQ'] == '2'
        assert cs['MAXCHECK'] == '10'
        assert cs['DAMPLIMIT'] == '0'
        assert cs['UNBALANCED'] == OPTION_UNBALANCED_STOP
        assert cs['DEMAND MODEL'] == OPTION_DEMAND_MODEL_DDA
        assert cs['MINIMUM PRESSURE'] == '0'
        assert cs['REQUIRED PRESSURE'] == '0.1'
        assert cs['PRESSURE EXPONENT'] == '0.5'
        assert cs['PATTERN'] == '1'
        assert cs['DEMAND MULTIPLIER'] == '1.0'
        assert cs['EMITTER EXPONENT'] == '0.5'
        assert cs['QUALITY'] == OPTION_QUALITY_NONE
        assert cs['DIFFUSIVITY'] == '1.0'
        assert cs['TOLERANCE'] == '0.01'

        cs = execute_undo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'option'
        assert cs['UNITS'] == OPTION_UNITS_GPM
        assert cs['HEADLOSS'] == OPTION_HEADLOSS_HW
        assert cs['VISCOSITY'] == '1.0'
        assert cs['SPECIFIC GRAVITY'] == '1.0'
        assert cs['TRIALS'] == '40'
        assert cs['ACCURACY'] == '0.001'
        assert cs['FLOWCHANGE'] == '0'
        assert cs['HEADERROR'] == '0'
        assert cs['CHECKFREQ'] == '2'
        assert cs['MAXCHECK'] == '10'
        assert cs['DAMPLIMIT'] == '0'
        assert cs['UNBALANCED'] == OPTION_UNBALANCED_STOP
        assert cs['DEMAND MODEL'] == OPTION_DEMAND_MODEL_DDA
        assert cs['MINIMUM PRESSURE'] == '0'
        assert cs['REQUIRED PRESSURE'] == '0.1'
        assert cs['PRESSURE EXPONENT'] == '0.5'
        assert cs['PATTERN'] == '1'
        assert cs['DEMAND MULTIPLIER'] == '1.0'
        assert cs['EMITTER EXPONENT'] == '0.5'
        assert cs['QUALITY'] == OPTION_QUALITY_NONE
        assert cs['DIFFUSIVITY'] == '1.0'
        assert cs['TOLERANCE'] == '0.01'

        cs = execute_redo(p).operations[0]
        assert cs['operation'] == API_UPDATE
        assert cs['type'] == 'option'
        assert cs['UNITS'] == OPTION_UNITS_LPS
        assert cs['HEADLOSS'] == OPTION_HEADLOSS_HW
        assert cs['VISCOSITY'] == '1.0'
        assert cs['SPECIFIC GRAVITY'] == '1.0'
        assert cs['TRIALS'] == '40'
        assert cs['ACCURACY'] == '0.001'
        assert cs['FLOWCHANGE'] == '0'
        assert cs['HEADERROR'] == '0'
        assert cs['CHECKFREQ'] == '2'
        assert cs['MAXCHECK'] == '10'
        assert cs['DAMPLIMIT'] == '0'
        assert cs['UNBALANCED'] == OPTION_UNBALANCED_STOP
        assert cs['DEMAND MODEL'] == OPTION_DEMAND_MODEL_DDA
        assert cs['MINIMUM PRESSURE'] == '0'
        assert cs['REQUIRED PRESSURE'] == '0.1'
        assert cs['PRESSURE EXPONENT'] == '0.5'
        assert cs['PATTERN'] == '1'
        assert cs['DEMAND MULTIPLIER'] == '1.0'
        assert cs['EMITTER EXPONENT'] == '0.5'
        assert cs['QUALITY'] == OPTION_QUALITY_NONE
        assert cs['DIFFUSIVITY'] == '1.0'
        assert cs['TOLERANCE'] == '0.01'

        self.leave(p)


    def test_snapshot(self):
        p = "test_snapshot"
        self.enter(p)

        add_junction(p, ChangeSet({'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j3', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j4', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))

        client_op = get_current_operation(p)
        assert client_op == 4
        assert take_snapshot(p, 'x') == 4

        execute_undo(p)
        execute_undo(p)
        add_junction(p, ChangeSet({'id': 'j5', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))
        add_junction(p, ChangeSet({'id': 'j6', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}))

        assert take_snapshot(p, 'xx') == 6

        cs = sync_with_server(p, client_op).operations
        cs[0]['operation'] = API_DELETE
        cs[0]['id'] = 'j4'
        cs[1]['operation'] = API_DELETE
        cs[1]['id'] = 'j3'
        cs[2]['operation'] = API_ADD
        cs[2]['id'] = 'j5'
        cs[3]['operation'] = API_ADD
        cs[3]['id'] = 'j6'

        cs = pick_snapshot(p, 'x').operations
        cs[0]['operation'] = 'delete'
        cs[0]['id'] = 'j6'
        cs[1]['operation'] = 'delete'
        cs[1]['id'] = 'j5'
        cs[2]['operation'] = 'add'
        cs[2]['id'] = 'j3'
        cs[3]['operation'] = 'add'
        cs[3]['id'] = 'j4'

        assert get_nodes(p) == ['j1', 'j2', 'j3', 'j4']

        self.leave(p)


    def test_batch_commands(self):
        p = 'test_batch_commands'
        self.enter(p)

        cs = ChangeSet()
        cs.add({'type': JUNCTION, 'id': 'j1', 'x': 0.0, 'y': 10.0, 'elevation': 20.0})
        cs.add({'type': JUNCTION, 'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0})
        cs.add({'type': JUNCTION, 'id': 'j2', 'x': 0.0, 'y': 10.0, 'elevation': 20.0}) # fail

        cs = execute_batch_commands(p, cs)
        assert len(cs.operations) == 2

        cs = ChangeSet()
        cs.delete({'type': JUNCTION, 'id': 'j1'})
        cs.delete({'type': JUNCTION, 'id': 'j2'})

        cs = execute_batch_commands(p, cs)
        assert len(cs.operations) == 2

        cs = execute_undo(p)
        assert len(cs.operations) == 1

        self.leave(p)


if __name__ == '__main__':
    pytest.main()