feat(frontend): useDrawerUrlState hook for ?claim= sync

2026-06-20 10:39:53 -06:00
parent c737bd742d
commit 234cd8b28b
2 changed files with 302 additions and 0 deletions
@@ -0,0 +1,198 @@
+// @vitest-environment happy-dom
+// Mirror the IS_REACT_ACT_ENVIRONMENT setup from the other hook tests so
+// React doesn't log act() warnings about the createRoot render/unmount
+// and the popstate-driven state updates.
+(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+
+import React, { act } from "react";
+import { createRoot, type Root } from "react-dom/client";
+import { describe, expect, it, vi, beforeEach, afterEach } from "vitest";
+import { useDrawerUrlState } from "./useDrawerUrlState";
+
+/**
+ * Minimal renderHook shim — same pattern as `useClaimDetail.test.ts`.
+ * The project doesn't ship `@testing-library/react`, so we wire a Probe
+ * component into a real `createRoot` and read its return value through
+ * a shared `result` object. `act` flushes React's state updates between
+ * micro-tasks so assertions after a popstate dispatch see the new value.
+ */
+function renderHook<TResult>(setup: () => TResult): {
+  result: { current: TResult | undefined };
+  unmount: () => void;
+} {
+  const result: { current: TResult | undefined } = { current: undefined };
+  const container = document.createElement("div");
+  document.body.appendChild(container);
+
+  function Probe() {
+    result.current = setup();
+    return null;
+  }
+
+  const root: Root = createRoot(container);
+  act(() => {
+    root.render(React.createElement(Probe));
+  });
+
+  return {
+    result,
+    unmount: () => {
+      act(() => root.unmount());
+      container.remove();
+    },
+  };
+}
+
+/**
+ * Point happy-dom's URL at a known value. happy-dom v20 doesn't expose a
+ * writable `window.location.search`, but `window.happyDOM.setURL` updates
+ * the URL the window reports without triggering a navigation — exactly
+ * what we want for mounting the hook at `/claims?claim=CLM-1` etc.
+ */
+function setLocation(url: string): void {
+  // happy-dom attaches the setURL helper under `window.happyDOM`. Cast
+  // through `unknown` to keep the test file free of happy-dom imports.
+  (window as unknown as { happyDOM: { setURL: (u: string) => void } }).happyDOM.setURL(url);
+}
+
+describe("useDrawerUrlState", () => {
+  // `vi.fn()` with no args in vitest 4 is typed `Mock<Procedure |
+  // Constructable>`, which carries a constructor signature and won't
+  // assign to `() => void`. Constraining the generic to `vi.fn<() => void>()`
+  // gives a plain function-typed mock that flows directly into `pushState`
+  // / `replaceState` slots.
+  let pushStateMock: ReturnType<typeof vi.fn>;
+  let replaceStateMock: ReturnType<typeof vi.fn>;
+
+  beforeEach(() => {
+    pushStateMock = vi.fn();
+    replaceStateMock = vi.fn();
+
+    // Replace `history` with a barebones stub. We only need pushState /
+    // replaceState (and a state slot for the History spec). `vi.stubGlobal`
+    // also affects `window.history` because happy-dom's window is the
+    // global object.
+    vi.stubGlobal("history", {
+      pushState: pushStateMock,
+      replaceState: replaceStateMock,
+      state: null,
+    });
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+    // Reset happy-dom's URL between tests so one test's `?claim=…` doesn't
+    // leak into the next test's "no param" assertion.
+    setLocation("http://localhost/");
+  });
+
+  it("reads the ?claim= param from window.location.search on mount", () => {
+    setLocation("http://localhost/claims?claim=CLM-1");
+
+    const { result, unmount } = renderHook(() => useDrawerUrlState());
+
+    expect(result.current?.claimId).toBe("CLM-1");
+    expect(typeof result.current?.open).toBe("function");
+    expect(typeof result.current?.close).toBe("function");
+    expect(typeof result.current?.setClaimId).toBe("function");
+
+    unmount();
+  });
+
+  it("returns null claimId when no ?claim= param is set", () => {
+    // setLocation to a URL with no ?claim= (default afterLocation is
+    // bare, but afterEach resets it explicitly — be defensive).
+    setLocation("http://localhost/claims");
+
+    const { result, unmount } = renderHook(() => useDrawerUrlState());
+
+    expect(result.current?.claimId).toBeNull();
+
+    unmount();
+  });
+
+  it("open(id) pushes a new history entry containing ?claim=id", () => {
+    setLocation("http://localhost/claims");
+
+    const { result, unmount } = renderHook(() => useDrawerUrlState());
+
+    act(() => {
+      result.current?.open("CLM-2");
+    });
+
+    expect(pushStateMock).toHaveBeenCalledTimes(1);
+    expect(replaceStateMock).not.toHaveBeenCalled();
+    // The third arg to pushState is the URL. The plan calls for a relative
+    // URL built from pathname+search+hash, so it should contain the
+    // ?claim= param.
+    const urlArg = pushStateMock.mock.calls[0][2] as string;
+    expect(urlArg).toContain("?claim=CLM-2");
+
+    unmount();
+  });
+
+  it("setClaimId(id) replaces the current history entry (no new entry) and does NOT pushState", () => {
+    setLocation("http://localhost/claims?claim=CLM-1");
+
+    const { result, unmount } = renderHook(() => useDrawerUrlState());
+
+    act(() => {
+      result.current?.setClaimId("CLM-3");
+    });
+
+    expect(replaceStateMock).toHaveBeenCalledTimes(1);
+    expect(pushStateMock).not.toHaveBeenCalled();
+    const urlArg = replaceStateMock.mock.calls[0][2] as string;
+    expect(urlArg).toContain("?claim=CLM-3");
+
+    unmount();
+  });
+
+  it("close() pushes a new history entry with the ?claim= param stripped", () => {
+    setLocation("http://localhost/claims?claim=CLM-1");
+
+    const { result, unmount } = renderHook(() => useDrawerUrlState());
+
+    act(() => {
+      result.current?.close();
+    });
+
+    expect(pushStateMock).toHaveBeenCalledTimes(1);
+    expect(replaceStateMock).not.toHaveBeenCalled();
+    const urlArg = pushStateMock.mock.calls[0][2] as string;
+    // The plan's spec: close strips the param. After close, the URL should
+    // not contain ?claim= (or contain it as empty — either way the param
+    // is effectively gone). Our implementation deletes the param entirely.
+    expect(urlArg).not.toContain("?claim=");
+    // claimId must also flip back to null synchronously after close.
+    expect(result.current?.claimId).toBeNull();
+
+    unmount();
+  });
+
+  it("updates claimId in response to popstate (browser back/forward)", async () => {
+    // Start on CLM-1; simulate the user navigating forward to CLM-2 via
+    // browser history (back/forward fires popstate). The hook must pick up
+    // the new URL even though it didn't trigger the navigation itself.
+    setLocation("http://localhost/claims?claim=CLM-1");
+
+    const { result, unmount } = renderHook(() => useDrawerUrlState());
+
+    expect(result.current?.claimId).toBe("CLM-1");
+
+    // Simulate browser back/forward: the URL changes and popstate fires.
+    // happy-dom does not dispatch popstate automatically when setURL is
+    // called, so we change the URL and dispatch the event ourselves — the
+    // same shape a real browser would produce.
+    setLocation("http://localhost/claims?claim=CLM-2");
+    await act(async () => {
+      window.dispatchEvent(new PopStateEvent("popstate"));
+      // Yield once so React's setState inside the listener flushes.
+      await Promise.resolve();
+    });
+
+    expect(result.current?.claimId).toBe("CLM-2");
+
+    unmount();
+  });
+});