[Angular] Improve coverage on MetricsComponent

generators/angular/templates/src/main/webapp/app/admin/metrics/metrics.component.spec.ts.ejs

@@ -16,18 +16,20 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -%>
+import { ChangeDetectorRef } from '@angular/core';
 import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
 import { HttpClientTestingModule } from '@angular/common/http/testing';
 import { of } from 'rxjs';
 
 import MetricsComponent from './metrics.component';
 import { MetricsService } from './metrics.service';
-import { Metrics } from './metrics.model';
+import { Metrics, Thread, ThreadDump } from './metrics.model';
 
 describe('MetricsComponent', () => {
   let comp: MetricsComponent;
   let fixture: ComponentFixture<MetricsComponent>;
   let service: MetricsService;
+  let changeDetector: ChangeDetectorRef;
 
   beforeEach(
     waitForAsync(() => {
@@ -43,18 +45,122 @@ describe('MetricsComponent', () => {
     fixture = TestBed.createComponent(MetricsComponent);
     comp = fixture.componentInstance;
     service = TestBed.inject(MetricsService);
+    changeDetector = fixture.debugElement.injector.get(ChangeDetectorRef);
   });
 
   describe('refresh', () => {
     it('should call refresh on init', () => {
       // GIVEN
-      jest.spyOn(service, 'getMetrics').mockReturnValue(of({} as Metrics));
+      const metrics = {
+        garbageCollector: {
+          'PS Scavenge': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+          'PS MarkSweep': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+        },
+      } as unknown as Metrics;
+      const threadDump = { threads: [ { threadName: 'thread 1' } as Thread] } as ThreadDump;
+
+      jest.spyOn(service, 'getMetrics').mockReturnValue(of(metrics));
+      jest.spyOn(service, 'threadDump').mockReturnValue(of(threadDump));
+      jest.spyOn(changeDetector.constructor.prototype, 'markForCheck');
 
       // WHEN
       comp.ngOnInit();
 
       // THEN
       expect(service.getMetrics).toHaveBeenCalled();
+      expect(comp.metrics).toEqual(metrics);
+      expect(comp.threads).toEqual(threadDump.threads);
+      expect(comp.updatingMetrics).toBeFalsy();
+      expect(changeDetector.constructor.prototype.markForCheck).toHaveBeenCalled();
+    });
+  });
+
+  describe('metricsKeyExists', () => {
+    it('should check that metrics key exists', () => {
+      // GIVEN
+      comp.metrics = {
+        garbageCollector: {
+          'PS Scavenge': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+          'PS MarkSweep': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+        },
+      } as unknown as Metrics;
+
+      // WHEN
+      const garbageCollectorKeyExists = comp.metricsKeyExists('garbageCollector');
+
+      // THEN
+      expect(garbageCollectorKeyExists).toBeTruthy();
+    });
+
+    it('should check that metrics key does not exist', () => {
+      // GIVEN
+      comp.metrics = {
+        garbageCollector: {
+          'PS Scavenge': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+          'PS MarkSweep': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+        },
+      } as unknown as Metrics;
+
+      // WHEN
+      const databasesCollectorKeyExists = comp.metricsKeyExists('databases');
+
+      // THEN
+      expect(databasesCollectorKeyExists).toBeFalsy();
+    });
+  });
+
+  describe('metricsKeyExistsAndObjectNotEmpty', () => {
+    it('should check that metrics key exists and is not empty', () => {
+      // GIVEN
+      comp.metrics = {
+        garbageCollector: {
+          'PS Scavenge': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+          'PS MarkSweep': {
+            collectionCount: 0,
+            collectionTime: 0,
+          },
+        },
+      } as unknown as Metrics;
+
+      // WHEN
+      const garbageCollectorKeyExistsAndNotEmpty = comp.metricsKeyExistsAndObjectNotEmpty('garbageCollector');
+
+      // THEN
+      expect(garbageCollectorKeyExistsAndNotEmpty).toBeTruthy();
+    });
+
+    it('should check that metrics key is empty', () => {
+      // GIVEN
+      comp.metrics = {
+        garbageCollector: {},
+      } as Metrics;
+
+      // WHEN
+      const garbageCollectorKeyEmpty = comp.metricsKeyExistsAndObjectNotEmpty('garbageCollector');
+
+      // THEN
+      expect(garbageCollectorKeyEmpty).toBeFalsy();
     });
   });
 });