test(cdk): implement test for local strategy to prove that it isn't w…

…orking
rx-angular · BioPhoton · Sep 23, 2021 · Sep 20, 2021 · Sep 20, 2021 · Sep 20, 2021
commit 23b9f77aaf190bd26e0a13b838860322ed934ea0
diff --git a/libs/cdk/spec/render-strategies/local.strategy.spec.ts b/libs/cdk/spec/render-strategies/local.strategy.spec.ts
@@ -0,0 +1,45 @@
+import { ɵglobal } from '@angular/core';
+import { TestScheduler } from 'rxjs/testing';
+import * as rxjs from 'rxjs';
+// tslint:d
9125
isable-next-line:nx-enforce-module-boundaries
+import { jestMatcher } from '@test-helpers';
+// tslint:disable-next-line:nx-enforce-module-boundaries
+import { accumulateObservables, animationFrameScheduler, RX_NATIVE_STRATEGIES } from '@rx-angular/cdk';
+// tslint:disable-next-line:nx-enforce-module-boundaries
+import { coalesceWith } from '@rx-angular/cdk/coalescing';
+import { BehaviorSubject, from, Observable, observeOn, of } from 'rxjs';
+
+
+let testScheduler: TestScheduler;
+let handles = [];
+let animationRuns = 0;
+function animate() {
+  handles.forEach(handle => handle());
+}
+beforeEach(() => {
+  testScheduler = new TestScheduler(jestMatcher);
+  animationRuns = 0;
+  handles = [];
+  ɵglobal.requestAnimationFrame = (cb?) => {
+    handles[animationRuns] = cb;
+    animationRuns++;
+    return animationRuns;
+  }
+  ɵglobal.cancelAnimationFrame = (id: number) => {
+    handles = handles.splice(id, 1);
+  }
+});
+
+// tslint:disable: no-duplicate-string
+describe('local strategy', () => {
+  it('should run on animationFrame', () => {
+    const values$ = from([1,2,3]);
+    const work = jest.fn();
+    values$.pipe(
+      RX_NATIVE_STRATEGIES.local.behavior(work)
+    ).subscribe();
+    expect(work).not.toHaveBeenCalled();
+    animate();
+    expect(work).toHaveBeenCalled();
+  });
+});