test(multiple): clean up DI in tests (#30848)

We have some tests that are using the `inject` function from `@angular/core/testing` to inject services. This hasn't been the standard for a while and leads to a lot of boilerplate. These changes switch to using `TestBed.inject` and clean up the existing code.

Author: crisbeto

Diff for: material.angular.io/src/app/shared/guide-items/guide-items.spec.ts

@@ -1,4 +1,4 @@
-import {TestBed, inject, waitForAsync} from '@angular/core/testing';
+import {TestBed, waitForAsync} from '@angular/core/testing';
 import {GuideItems} from './guide-items';
 
 describe('GuideItems', () => {
@@ -9,10 +9,6 @@ describe('GuideItems', () => {
     guideItems = TestBed.inject(GuideItems);
   }));
 
-  beforeEach(inject([GuideItems], (gi: GuideItems) => {
-    guideItems = gi;
-  }));
-
   it('should get a list of all guide items', () => {
     expect(guideItems.getAllItems()).toBeDefined();
     expect(guideItems.getAllItems().length).toBeGreaterThan(0);

Diff for: material.angular.io/src/app/shared/style-manager/style-manager.spec.ts

@@ -1,28 +1,27 @@
 import {HttpClientTestingModule} from '@angular/common/http/testing';
-import {inject, TestBed} from '@angular/core/testing';
+import {TestBed} from '@angular/core/testing';
 import {StyleManager} from './style-manager';
 
 describe('StyleManager', () => {
   let styleManager: StyleManager;
 
-  beforeEach(() =>
+  beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [HttpClientTestingModule],
       providers: [StyleManager],
-    }),
-  );
+    });
 
-  beforeEach(inject([StyleManager], (sm: StyleManager) => {
-    styleManager = sm;
-  }));
+    styleManager = TestBed.inject(StyleManager);
+  });
 
   afterEach(() => {
     const links = document.head.querySelectorAll('link');
-    for (const link of Array.prototype.slice.call(links)) {
+
+    Array.from(links).forEach(link => {
       if (link.className.includes('style-manager-')) {
-        document.head.removeChild(link);
+        link.remove();
       }
-    }
+    });
   });
 
   it('should add stylesheet to head', () => {

Diff for: src/cdk/a11y/focus-monitor/focus-monitor.spec.ts

@@ -2,7 +2,7 @@ import {TAB} from '../../keycodes';
 import {Platform} from '../../platform';
 import {DOCUMENT} from '@angular/common';
 import {Component, ViewChild} from '@angular/core';
-import {ComponentFixture, TestBed, fakeAsync, flush, inject, tick} from '@angular/core/testing';
+import {ComponentFixture, TestBed, fakeAsync, flush, tick} from '@angular/core/testing';
 import {By} from '@angular/platform-browser';
 import {
   createMouseEvent,
@@ -60,19 +60,17 @@ describe('FocusMonitor', () => {
         },
       ],
     });
-  });
 
-  beforeEach(inject([FocusMonitor], (fm: FocusMonitor) => {
     fixture = TestBed.createComponent(PlainButton);
     fixture.detectChanges();
 
     buttonElement = fixture.debugElement.query(By.css('button'))!.nativeElement;
-    focusMonitor = fm;
+    focusMonitor = TestBed.inject(FocusMonitor);
 
     changeHandler = jasmine.createSpy('focus origin change handler');
     focusMonitor.monitor(buttonElement).subscribe(changeHandler);
     patchElementFocus(buttonElement);
-  }));
+  });
 
   it('manually registered element should receive focus classes', fakeAsync(() => {
     buttonElement.focus();
@@ -479,19 +477,17 @@ describe('FocusMonitor with "eventual" detection', () => {
         },
       ],
     });
-  });
 
-  beforeEach(inject([FocusMonitor], (fm: FocusMonitor) => {
     fixture = TestBed.createComponent(PlainButton);
     fixture.detectChanges();
 
     buttonElement = fixture.debugElement.query(By.css('button'))!.nativeElement;
-    focusMonitor = fm;
+    focusMonitor = TestBed.inject(FocusMonitor);
 
     changeHandler = jasmine.createSpy('focus origin change handler');
     focusMonitor.monitor(buttonElement).subscribe(changeHandler);
     patchElementFocus(buttonElement);
-  }));
+  });
 
   it('should not clear the focus origin, even after a few seconds', fakeAsync(() => {
     dispatchKeyboardEvent(document, 'keydown', TAB);
@@ -712,8 +708,8 @@ describe('cdkMonitorFocus', () => {
     let childElement: HTMLElement;
     let focusMonitor: FocusMonitor;
 
-    beforeEach(inject([FocusMonitor], (fm: FocusMonitor) => {
-      focusMonitor = fm;
+    beforeEach(() => {
+      focusMonitor = TestBed.inject(FocusMonitor);
       fixture = TestBed.createComponent(
         ComplexComponentWithMonitorSubtreeFocusAndMonitorElementFocus,
       );
@@ -724,7 +720,7 @@ describe('cdkMonitorFocus', () => {
 
       patchElementFocus(parentElement);
       patchElementFocus(childElement);
-    }));
+    });
 
     it('should add keyboard focus classes on both elements when child is focused via keyboard', fakeAsync(() => {
       focusMonitor.focusVia(childElement, 'keyboard');
@@ -828,15 +824,12 @@ describe('FocusMonitor observable stream', () => {
       imports: [A11yModule, PlainButton],
       providers: [{provide: Platform, useValue: fakePlatform}],
     });
-  });
-
-  beforeEach(inject([FocusMonitor], (fm: FocusMonitor) => {
     fixture = TestBed.createComponent(PlainButton);
-    focusMonitor = fm;
+    focusMonitor = TestBed.inject(FocusMonitor);
     fixture.detectChanges();
     buttonElement = fixture.debugElement.nativeElement.querySelector('button');
     patchElementFocus(buttonElement);
-  }));
+  });
 
   it('should not emit on the server', fakeAsync(() => {
     fakePlatform.isBrowser = false;
@@ -865,16 +858,13 @@ describe('FocusMonitor input label detection', () => {
     TestBed.configureTestingModule({
       imports: [A11yModule, CheckboxWithLabel],
     });
-  });
-
-  beforeEach(inject([FocusMonitor], (fm: FocusMonitor) => {
     fixture = TestBed.createComponent(CheckboxWithLabel);
-    focusMonitor = fm;
+    focusMonitor = TestBed.inject(FocusMonitor);
     fixture.detectChanges();
     inputElement = fixture.nativeElement.querySelector('input');
     labelElement = fixture.nativeElement.querySelector('label');
     patchElementFocus(inputElement);
-  }));
+  });
 
   it('should detect label click focus as `mouse`', fakeAsync(() => {
     const spy = jasmine.createSpy('monitor spy');

Diff for: src/cdk/a11y/focus-monitor/focus-monitor.zone.spec.ts

@@ -1,7 +1,7 @@
 import {Platform} from '../../platform';
 import {patchElementFocus} from '../../testing/private';
 import {Component, NgZone, provideZoneChangeDetection} from '@angular/core';
-import {ComponentFixture, TestBed, fakeAsync, inject, tick} from '@angular/core/testing';
+import {ComponentFixture, TestBed, fakeAsync, tick} from '@angular/core/testing';
 import {A11yModule} from '../a11y-module';
 import {FocusMonitor} from './focus-monitor';
 
@@ -17,15 +17,12 @@ describe('FocusMonitor observable stream Zone.js integration', () => {
       imports: [A11yModule, PlainButton],
       providers: [{provide: Platform, useValue: fakePlatform}, provideZoneChangeDetection()],
     });
-  });
-
-  beforeEach(inject([FocusMonitor], (fm: FocusMonitor) => {
     fixture = TestBed.createComponent(PlainButton);
-    focusMonitor = fm;
+    focusMonitor = TestBed.inject(FocusMonitor);
     fixture.detectChanges();
     buttonElement = fixture.debugElement.nativeElement.querySelector('button');
     patchElementFocus(buttonElement);
-  }));
+  });
 
   it('should emit inside the NgZone', fakeAsync(() => {
     const spy = jasmine.createSpy('zone spy');

Diff for: src/cdk/drag-drop/drag-drop-registry.spec.ts

@@ -1,5 +1,5 @@
 import {Component} from '@angular/core';
-import {fakeAsync, TestBed, ComponentFixture, inject} from '@angular/core/testing';
+import {fakeAsync, TestBed, ComponentFixture} from '@angular/core/testing';
 import {
   createMouseEvent,
   dispatchMouseEvent,
@@ -22,10 +22,7 @@ describe('DragDropRegistry', () => {
 
     fixture = TestBed.createComponent(BlankComponent);
     fixture.detectChanges();
-
-    inject([DragDropRegistry], (c: DragDropRegistry) => {
-      registry = c;
-    })();
+    registry = TestBed.inject(DragDropRegistry);
   }));
 
   it('should be able to start dragging an item', () => {

Diff for: src/cdk/layout/breakpoints-observer.spec.ts

@@ -9,7 +9,7 @@
 import {LayoutModule} from './layout-module';
 import {BreakpointObserver, BreakpointState} from './breakpoints-observer';
 import {MediaMatcher} from './media-matcher';
-import {fakeAsync, TestBed, inject, flush, tick} from '@angular/core/testing';
+import {fakeAsync, TestBed, flush, tick} from '@angular/core/testing';
 import {Injectable} from '@angular/core';
 import {Subscription} from 'rxjs';
 import {skip, take} from 'rxjs/operators';
@@ -23,16 +23,10 @@ describe('BreakpointObserver', () => {
       imports: [LayoutModule],
       providers: [{provide: MediaMatcher, useClass: FakeMediaMatcher}],
     });
+    breakpointObserver = TestBed.inject(BreakpointObserver);
+    mediaMatcher = TestBed.inject(MediaMatcher) as unknown as FakeMediaMatcher;
   }));
 
-  beforeEach(inject(
-    [BreakpointObserver, MediaMatcher],
-    (bm: BreakpointObserver, mm: FakeMediaMatcher) => {
-      breakpointObserver = bm;
-      mediaMatcher = mm;
-    },
-  ));
-
   afterEach(() => {
     mediaMatcher.clear();
   });

Diff for: src/cdk/layout/media-matcher.spec.ts

@@ -6,41 +6,40 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 import {MediaMatcher} from './media-matcher';
-import {inject} from '@angular/core/testing';
+import {TestBed} from '@angular/core/testing';
 import {Platform} from '../platform';
 
 describe('MediaMatcher', () => {
   let mediaMatcher: MediaMatcher;
+  let platform: Platform;
 
-  beforeEach(inject([MediaMatcher], (mm: MediaMatcher) => {
-    mediaMatcher = mm;
-  }));
+  beforeEach(() => {
+    mediaMatcher = TestBed.inject(MediaMatcher);
+    platform = TestBed.inject(Platform);
+  });
 
   it('correctly returns a MediaQueryList to check for matches', () => {
     expect(mediaMatcher.matchMedia('(min-width: 1px)').matches).toBeTruthy();
     expect(mediaMatcher.matchMedia('(max-width: 1px)').matches).toBeFalsy();
   });
 
-  it('should add CSS rules for provided queries when the platform is webkit or blink', inject(
-    [Platform],
-    (platform: Platform) => {
-      const width = '123456px';
+  it('should add CSS rules for provided queries when the platform is webkit or blink', () => {
+    const width = '123456px';
 
-      expect(getStyleTagByString(width)).toBeFalsy();
-      mediaMatcher.matchMedia(`(width: ${width})`);
+    expect(getStyleTagByString(width)).toBeFalsy();
+    mediaMatcher.matchMedia(`(width: ${width})`);
 
-      if (platform.WEBKIT || platform.BLINK) {
-        expect(getStyleTagByString(width)).toBeTruthy();
-      } else {
-        expect(getStyleTagByString(width)).toBeFalsy();
-      }
+    if (platform.WEBKIT || platform.BLINK) {
+      expect(getStyleTagByString(width)).toBeTruthy();
+    } else {
+      expect(getStyleTagByString(width)).toBeFalsy();
+    }
 
-      function getStyleTagByString(str: string): HTMLStyleElement | undefined {
-        return Array.from(document.head!.querySelectorAll('style')).find(tag => {
-          const rules = tag.sheet ? Array.from((tag.sheet as CSSStyleSheet).cssRules) : [];
-          return !!rules.find(rule => rule.cssText.includes(str));
-        });
-      }
-    },
-  ));
+    function getStyleTagByString(str: string): HTMLStyleElement | undefined {
+      return Array.from(document.head!.querySelectorAll('style')).find(tag => {
+        const rules = tag.sheet ? Array.from((tag.sheet as CSSStyleSheet).cssRules) : [];
+        return !!rules.find(rule => rule.cssText.includes(str));
+      });
+    }
+  });
 });

Diff for: src/cdk/observers/observe-content.spec.ts

@@ -1,12 +1,5 @@
 import {Component, ElementRef, ViewChild} from '@angular/core';
-import {
-  ComponentFixture,
-  TestBed,
-  fakeAsync,
-  inject,
-  tick,
-  waitForAsync,
-} from '@angular/core/testing';
+import {ComponentFixture, TestBed, fakeAsync, tick, waitForAsync} from '@angular/core/testing';
 import {ContentObserver, MutationObserverFactory, ObserversModule} from './observe-content';
 
 describe('Observe content directive', () => {
@@ -147,10 +140,8 @@ describe('ContentObserver injectable', () => {
           },
         ],
       });
-    }));
 
-    beforeEach(inject([ContentObserver], (co: ContentObserver) => {
-      contentObserver = co;
+      contentObserver = TestBed.inject(ContentObserver);
     }));
 
     it('should trigger the callback when the content of the element changes', fakeAsync(() => {
@@ -168,33 +159,32 @@ describe('ContentObserver injectable', () => {
       expect(spy).toHaveBeenCalled();
     }));
 
-    it('should only create one MutationObserver when observing the same element twice', fakeAsync(
-      inject([MutationObserverFactory], (mof: MutationObserverFactory) => {
-        const spy = jasmine.createSpy('content observer');
-        spyOn(mof, 'create').and.callThrough();
-        const fixture = TestBed.createComponent(UnobservedComponentWithTextContent);
-        fixture.detectChanges();
+    it('should only create one MutationObserver when observing the same element twice', fakeAsync(() => {
+      const observerFactory = TestBed.inject(MutationObserverFactory);
+      const spy = jasmine.createSpy('content observer');
+      spyOn(observerFactory, 'create').and.callThrough();
+      const fixture = TestBed.createComponent(UnobservedComponentWithTextContent);
+      fixture.detectChanges();
 
-        const sub1 = contentObserver
-          .observe(fixture.componentInstance.contentEl)
-          .subscribe(() => spy());
-        contentObserver.observe(fixture.componentInstance.contentEl).subscribe(() => spy());
+      const sub1 = contentObserver
+        .observe(fixture.componentInstance.contentEl)
+        .subscribe(() => spy());
+      contentObserver.observe(fixture.componentInstance.contentEl).subscribe(() => spy());
 
-        expect(mof.create).toHaveBeenCalledTimes(1);
+      expect(observerFactory.create).toHaveBeenCalledTimes(1);
 
-        fixture.componentInstance.text = 'text';
-        invokeCallbacks([{type: 'fake'}]);
+      fixture.componentInstance.text = 'text';
+      invokeCallbacks([{type: 'fake'}]);
 
-        expect(spy).toHaveBeenCalledTimes(2);
+      expect(spy).toHaveBeenCalledTimes(2);
 
-        spy.calls.reset();
-        sub1.unsubscribe();
-        fixture.componentInstance.text = 'text text';
-        invokeCallbacks([{type: 'fake'}]);
+      spy.calls.reset();
+      sub1.unsubscribe();
+      fixture.componentInstance.text = 'text text';
+      invokeCallbacks([{type: 'fake'}]);
 
-        expect(spy).toHaveBeenCalledTimes(1);
-      }),
-    ));
+      expect(spy).toHaveBeenCalledTimes(1);
+    }));
   });
 
   describe('real behavior', () => {