74199: Lint and LGTM fixes + HoverClassDirective JSDocs and tests

src/app/shared/hover-class.directive.spec.ts

@@ -0,0 +1,35 @@
+import { Component, DebugElement } from '@angular/core';
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+import { HoverClassDirective } from './hover-class.directive';
+import { By } from '@angular/platform-browser';
+
+@Component({
+  template: `<div dsHoverClass="ds-hover"></div>`
+})
+class TestComponent { }
+
+describe('HoverClassDirective', () => {
+  let component: TestComponent;
+  let fixture: ComponentFixture<TestComponent>;
+  let el: DebugElement;
+
+  beforeEach(() => {
+    fixture = TestBed.configureTestingModule({
+      declarations: [TestComponent, HoverClassDirective]
+    }).createComponent(TestComponent);
+
+    fixture.detectChanges();
+    component = fixture.componentInstance;
+    el = fixture.debugElement.query(By.css('div'));
+  });
+
+  it('should add the class on mouseenter and remove on mouseleave', () => {
+    el.triggerEventHandler('mouseenter', null);
+    fixture.detectChanges();
+    expect(el.nativeElement.classList).toContain('ds-hover');
+
+    el.triggerEventHandler('mouseleave', null);
+    fixture.detectChanges();
+    expect(el.nativeElement.classList).not.toContain('ds-hover');
+  });
+});