test(scheduler): add interval recycling tests

cartant · Nov 9, 2017 · 81bfe55 · 81bfe55
1 parent d77e3d7
commit 81bfe55
Showing 1 changed file with 51 additions and 0 deletions.
diff --git a/spec/schedulers/AsapScheduler-spec.ts b/spec/schedulers/AsapScheduler-spec.ts
@@ -40,6 +40,57 @@ describe('Scheduler.asap', () => {
     sandbox.restore();
   });
 
+  it('should reuse the interval for recursively scheduled actions with the same delay', () => {
+    const sandbox = sinon.sandbox.create();
+    const fakeTimer = sandbox.useFakeTimers();
+    const stubSetInterval = sinon.stub(global, 'setInterval').callThrough();
+    function dispatch(state: any): void {
+      state.index += 1;
+      if (state.index < 3) {
+        (<any> this).schedule(state, state.period);
+      }
+    }
+    const period = 50;
+    const state = { index: 0, period };
+    asap.schedule(dispatch, period, state);
+    expect(state).to.have.property('index', 0);
+    expect(stubSetInterval).to.have.property('callCount', 1);
+    fakeTimer.tick(period);
+    expect(state).to.have.property('index', 1);
+    expect(stubSetInterval).to.have.property('callCount', 1);
+    fakeTimer.tick(period);
+    expect(state).to.have.property('index', 2);
+    expect(stubSetInterval).to.have.property('callCount', 1);
+    stubSetInterval.restore();
+    sandbox.restore();
+  });
+
+  it('should not reuse the interval for recursively scheduled actions with a different delay', () => {
+    const sandbox = sinon.sandbox.create();
+    const fakeTimer = sandbox.useFakeTimers();
+    const stubSetInterval = sinon.stub(global, 'setInterval').callThrough();
+    function dispatch(state: any): void {
+      state.index += 1;
+      state.period -= 1;
+      if (state.index < 3) {
+        (<any> this).schedule(state, state.period);
+      }
+    }
+    const period = 50;
+    const state = { index: 0, period };
+    asap.schedule(dispatch, period, state);
+    expect(state).to.have.property('index', 0);
+    expect(stubSetInterval).to.have.property('callCount', 1);
+    fakeTimer.tick(period);
+    expect(state).to.have.property('index', 1);
+    expect(stubSetInterval).to.have.property('callCount', 2);
+    fakeTimer.tick(period);
+    expect(state).to.have.property('index', 2);
+    expect(stubSetInterval).to.have.property('callCount', 3);
+    stubSetInterval.restore();
+    sandbox.restore();
+  });
+
   it('should schedule an action to happen later', (done: MochaDone) => {
     let actionHappened = false;
     asap.schedule(() => {