browser/libs/components/src/toggle-group/toggle.component.spec.ts

import { Component } from "@angular/core";
import { ComponentFixture, TestBed, waitForAsync } from "@angular/core/testing";
import { By } from "@angular/platform-browser";

import { ToggleGroupComponent } from "./toggle-group.component";
import { ToggleGroupModule } from "./toggle-group.module";

describe("Button", () => {
  let mockGroupComponent: MockedButtonGroupComponent;
  let fixture: ComponentFixture<TestApp>;
  let testAppComponent: TestApp;
  let radioButton: HTMLInputElement;

  beforeEach(waitForAsync(() => {
    mockGroupComponent = new MockedButtonGroupComponent();

    TestBed.configureTestingModule({
      imports: [ToggleGroupModule],
      declarations: [TestApp],
      providers: [{ provide: ToggleGroupComponent, useValue: mockGroupComponent }],
    });

    // FIXME: Verify that this floating promise is intentional. If it is, add an explanatory comment and ensure there is proper error handling.
    // eslint-disable-next-line @typescript-eslint/no-floating-promises
    TestBed.compileComponents();
    fixture = TestBed.createComponent(TestApp);
    testAppComponent = fixture.debugElement.componentInstance;
    radioButton = fixture.debugElement.query(By.css("input[type=radio]")).nativeElement;
  }));

  it("should emit value when clicking on radio button", () => {
    testAppComponent.value = "value";
    fixture.detectChanges();

    radioButton.click();
    fixture.detectChanges();

    expect(mockGroupComponent.onInputInteraction).toHaveBeenCalledWith("value");
  });

  it("should check radio button when selected matches value", () => {
    testAppComponent.value = "value";
    fixture.detectChanges();

    mockGroupComponent.selected = "value";
    fixture.detectChanges();

    expect(radioButton.checked).toBe(true);
  });

  it("should not check radio button when selected does not match value", () => {
    testAppComponent.value = "value";
    fixture.detectChanges();

    mockGroupComponent.selected = "nonMatchingValue";
    fixture.detectChanges();

    expect(radioButton.checked).toBe(false);
  });
});

class MockedButtonGroupComponent implements Partial<ToggleGroupComponent> {
  onInputInteraction = jest.fn();
  selected = null;
}

@Component({
  selector: "test-app",
  template: ` <bit-toggle [value]="value">Element</bit-toggle>`,
})
class TestApp {
  value?: string;
}