1 files changed, 68 insertions, 0 deletions
diff --git a/src/pybind/mgr/dashboard/frontend/src/app/shared/services/timer.service.spec.ts b/src/pybind/mgr/dashboard/frontend/src/app/shared/services/timer.service.spec.ts
new file mode 100644
index 000000000..10b528e3a
--- /dev/null
+++ b/src/pybind/mgr/dashboard/frontend/src/app/shared/services/timer.service.spec.ts
@@ -0,0 +1,68 @@
+import { fakeAsync, TestBed, tick } from '@angular/core/testing';
+
+import { of, Subscription } from 'rxjs';
+
+import { configureTestBed } from '~/testing/unit-test-helper';
+import { TimerService } from './timer.service';
+
+describe('TimerService', () => {
+  let service: TimerService;
+  let subs: Subscription;
+  let receivedData: any[];
+  const next = () => of(true);
+  const observer = (data: boolean) => {
+    receivedData.push(data);
+  };
+
+  configureTestBed({
+    providers: [TimerService]
+  });
+
+  beforeEach(() => {
+    service = TestBed.inject(TimerService);
+    receivedData = [];
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+
+  it('should not emit any value when no subscribers', fakeAsync(() => {
+    subs = service.get(next).subscribe(observer);
+    tick(service.DEFAULT_REFRESH_INTERVAL);
+    expect(receivedData.length).toEqual(2);
+
+    subs.unsubscribe();
+
+    tick(service.DEFAULT_REFRESH_INTERVAL);
+    expect(receivedData.length).toEqual(2);
+  }));
+
+  it('should emit value with no dueTime and no refresh interval', fakeAsync(() => {
+    subs = service.get(next, null, null).subscribe(observer);
+    tick(service.DEFAULT_REFRESH_INTERVAL);
+    expect(receivedData.length).toEqual(1);
+    expect(receivedData).toEqual([true]);
+
+    subs.unsubscribe();
+  }));
+
+  it('should emit expected values when refresh interval + no dueTime', fakeAsync(() => {
+    subs = service.get(next).subscribe(observer);
+    tick(service.DEFAULT_REFRESH_INTERVAL * 2);
+    expect(receivedData.length).toEqual(3);
+    expect(receivedData).toEqual([true, true, true]);
+
+    subs.unsubscribe();
+  }));
+
+  it('should emit expected values when dueTime equal to refresh interval', fakeAsync(() => {
+    const dueTime = 1000;
+    subs = service.get(next, service.DEFAULT_REFRESH_INTERVAL, dueTime).subscribe(observer);
+    tick(service.DEFAULT_REFRESH_INTERVAL * 2);
+    expect(receivedData.length).toEqual(2);
+    expect(receivedData).toEqual([true, true]);
+
+    subs.unsubscribe();
+  }));
+});