fix(api): align frontend with REST contracts

src/components/olmap/BurstSimulation/schemePipeDiameters.test.ts

@@ -1,4 +1,48 @@
-import { getPipeDiameterDisplay } from "./schemePipeDiameters";
+import { queryFeaturesByIds } from "@/utils/mapQueryService";
+import {
+  clearPipeDiameterCache,
+  getPipeDiameterDisplay,
+  loadPipeDiameters,
+} from "./schemePipeDiameters";
+
+jest.mock("@/utils/mapQueryService", () => ({
+  queryFeaturesByIds: jest.fn(),
+}));
+
+const feature = (id: string, diameter: number) => ({
+  getProperties: () => ({ id, diameter }),
+});
+
+afterEach(() => {
+  clearPipeDiameterCache();
+  jest.clearAllMocks();
+});
+
+describe("loadPipeDiameters", () => {
+  it("shares an in-flight WFS request and reuses its resolved result", async () => {
+    let resolveFeatures: ((features: ReturnType<typeof feature>[]) => void) | undefined;
+    const pendingFeatures = new Promise<ReturnType<typeof feature>[]>((resolve) => {
+      resolveFeatures = resolve;
+    });
+    (queryFeaturesByIds as jest.Mock).mockImplementation(
+      async () => pendingFeatures,
+    );
+
+    const firstRequest = loadPipeDiameters(["P-1"]);
+    const duplicateRequest = loadPipeDiameters(["P-1"]);
+
+    expect(queryFeaturesByIds).toHaveBeenCalledTimes(1);
+
+    resolveFeatures?.([feature("P-1", 315)]);
+    await expect(firstRequest).resolves.toEqual({ "P-1": 315 });
+    await expect(duplicateRequest).resolves.toEqual({ "P-1": 315 });
+
+    await expect(loadPipeDiameters(["P-1"])).resolves.toEqual({
+      "P-1": 315,
+    });
+    expect(queryFeaturesByIds).toHaveBeenCalledTimes(1);
+  });
+});
 
 describe("getPipeDiameterDisplay", () => {
   it("shows the actual diameter for one burst pipe", () => {