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  • @Component({
      selector: "app-root",
      templateUrl: "app.component.html",
      styleUrls: ["app.component.css"],
      animations: [
        slideInAnimation,
        // animation triggers go here
      ],
    })
    export class AppComponent {
      @HostBinding("@.disabled")
      public animationsDisabled = false;
    }
    
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  • import {
      Component,
      EventEmitter,
      HostBinding,
      Input,
      Output,
    } from "@angular/core";
    import {
      animate,
      state,
      style,
      transition,
      trigger,
    } from "@angular/animations";
    
    @Component({
      selector: "my-popup",
      template: `
        Popup: {{ message }}
        
      `,
      animations: [
        trigger("state", [
          state(
            "opened",
            style({ transform: "translateY(0%)" })
          ),
          state(
            "void, closed",
            style({ transform: "translateY(100%)", opacity: 0 })
          ),
          transition("* => *", animate("100ms ease-in")),
        ]),
      ],
      styles: [
        `
          :host {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: #009cff;
            height: 48px;
            padding: 16px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid black;
            font-size: 24px;
          }
    
          button {
            border-radius: 50%;
          }
        `,
      ],
    })
    export class PopupComponent {
      @HostBinding("@state")
      state: "opened" | "closed" = "closed";
    
      @Input()
      get message(): string {
        return this._message;
      }
      set message(message: string) {
        this._message = message;
        this.state = "opened";
      }
      private _message = "";
    
      @Output()
      closed = new EventEmitter();
    }
    
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  • animations: [
        trigger('pageAnimations', [
          transition(':enter', [
            query('.hero, form', [
              style({opacity: 0, transform: 'translateY(-100px)'}),
              stagger(-30, [
                animate('500ms cubic-bezier(0.35, 0, 0.25, 1)', style({ opacity: 1, transform: 'none' }))
              ])
            ])
          ])
        ]),
      ]
    })
    export class HeroListPageComponent implements OnInit {
      @HostBinding('@pageAnimations')
      public animatePage = true;
    
      heroTotal = -1;
      get heroes() { return this._heroes; }
      private _heroes: Hero[] = [];
    
      ngOnInit() {
        this._heroes = HEROES;
      }
    
      updateCriteria(criteria: string) {
        criteria = criteria ? criteria.trim() : '';
    
        this._heroes = HEROES.filter(hero => hero.name.toLowerCase().includes(criteria.toLowerCase()));
        const newTotal = this.heroes.length;
    
        if (this.heroTotal !== newTotal) {
          this.heroTotal = newTotal;
        } else if (!criteria) {
          this.heroTotal = -1;
        }
      }
    }
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  • @Directive({
      selector: "[appHighlight]",
    })
    export class HighlightDirective {
      constructor(private el: ElementRef) {}
    
      @HostListener("mouseenter") onMouseEnter() {
        this.highlight("yellow");
      }
    
      @HostListener("mouseleave") onMouseLeave() {
        this.highlight("");
      }
    
      private highlight(color: string) {
        this.el.nativeElement.style.backgroundColor = color;
      }
    }
    
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  • import {
      Directive,
      ElementRef,
      HostListener,
      Input,
    } from "@angular/core";
    
    @Directive({
      selector: "[appHighlight]",
    })
    export class HighlightDirective {
      @Input("appHighlight") highlightColor = "";
    
      private el: HTMLElement;
    
      constructor(el: ElementRef) {
        this.el = el.nativeElement;
      }
    
      @HostListener("mouseenter") onMouseEnter() {
        this.highlight(this.highlightColor || "cyan");
      }
    
      @HostListener("mouseleave") onMouseLeave() {
        this.highlight("");
      }
    
      private highlight(color: string) {
        this.el.style.backgroundColor = color;
      }
    }
    
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  • @HostListener('mouseenter') onMouseEnter() {
      this.highlight('yellow');
    }
    
    @HostListener('mouseleave') onMouseLeave() {
      this.highlight('');
    }
    
    private highlight(color: string) {
      this.el.nativeElement.style.backgroundColor = color;
    }
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  • @HostListener('mouseenter') onMouseEnter() {
      this.highlight(this.highlightColor || this.defaultColor || 'red');
    }
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  • test("loads items eventually", async () => {
      // Click button
      fireEvent.click(getByText(node, "Load"));
    
      // Wait for page to update with query text
      const items = await findByText(node, /Item #[0-9]: /);
      expect(items).toHaveLength(10);
    });
    
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  • test("movie title appears", async () => {
      // element is initially not present...
    
      // wait for appearance inside an assertion
      await waitFor(() => {
        expect(getByText("the lion king")).toBeInTheDocument();
      });
    });
    
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  • const puppeteer = require("puppeteer");
    const {
      getDocument,
      queries,
      waitFor,
    } = require("pptr-testing-library");
    
    const { getByTestId, getByLabelText } = queries;
    
    const browser = await puppeteer.launch();
    const page = await browser.newPage();
    
    // Grab ElementHandle for document
    const $document = await getDocument(page);
    // Your favorite query methods are available
    const $form = await getByTestId($document, "my-form");
    // returned elements are Puppeteer ElementHandles too!
    const $email = await getByLabelText($form, "Email");
    // interact with puppeteer like usual
    await $email.type("pptr@example.com");
    // waiting works too!
    await waitFor(() => getByText("Loading..."));
    
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  • await fireEvent.click(getByText("Click me"));
    
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  • const handler = jest.fn();
    
    const {
      container: { firstChild: input },
    } = render();
    
    fireEvent.input(input, { target: { value: "a" } });
    
    expect(handler).toHaveBeenCalledTimes(1);
    
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  • const ref = createRef();
    const spy = jest.fn();
    
    render(
      h(elementType, {
        onDblClick: spy,
        ref,
      })
    );
    
    fireEvent["onDblClick"](ref.current);
    
    expect(spy).toHaveBeenCalledTimes(1);
    
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  • const { getByLabelText, queryAllByTestId } =
      render(Component);
    
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  • // With options.
    const { results } = render(YourComponent, {
      target: MyTarget,
      props: { myProp: "value" },
    });
    
    // Props only.
    const { results } = render(YourComponent, {
      myProp: "value",
    });
    
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  • const cb = jest.fn();
    
    
    function Counter() {
      useEffect(cb);
    
    
      const [count, setCount] = useState(0);
    
    
      return ;
    }
    
    
    const { container: { firstChild: buttonNode }, } = render();
    
    
    // Clear the first call to useEffect that the initial render triggers.
    cb.mockClear();
    
    
    // Fire event Option 1.
    fireEvent.click(buttonNode);
    
    
    // Fire event Option 2.
    fireEvent(
    buttonNode,
    new Event('MouseEvent', {
      bubbles: true,
      cancelable: true,
      button: 0,
    });
    
    
    expect(buttonNode).toHaveTextContent('1');
    expect(cb).toHaveBeenCalledTimes(1);
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  • const table = document.createElement("table");
    
    const { container } = render(TableBody, {
      props,
      container: document.body.appendChild(table),
    });
    
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  • const { getByDataCy } = render();
    
    expect(getByDataCy("my-component")).toHaveTextContent(
      "Hello"
    );
    
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  • test("has correct welcome text", () => {
      render();
      expect(screen.getByRole("heading")).toHaveTextContent(
        "Welcome, John Doe"
      );
    });
    
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  • render();
    
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  • test("handles click correctly", () => {
      render();
    
      userEvent.click(screen.getByText("Check"));
      expect(screen.getByLabelText("Check")).toBeChecked();
    });
    
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  • // Example, a function to traverse table contents
    import * as tableQueries from "my-table-query-library";
    import { queries } from "@testing-library/react";
    
    const { getByRowColumn, getByText } = render(, {
      queries: { ...queries, ...tableQueries },
    });
    
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  • test("has correct input value", () => {
      render();
      expect(screen.getByRole("form")).toHaveFormValues({
        firstName: "John",
        lastName: "Doe",
      });
    });
    
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  • const table = document.createElement("table");
    
    const { container } = render(, {
      container: document.body.appendChild(table),
    });
    
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  • // @testing-library/react
    const { container } = render();
    const foo = container.querySelector('[data-foo="bar"]');
    
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  • const { getByLabelText, queryAllByTestId } = render(
      
    );
    
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  • test("movie title goes away", async () => {
      // element is initially present...
      // note use of queryBy instead of getBy to return null
      // instead of throwing in the query itself
      await waitFor(() => {
        expect(queryByText("i, robot")).not.toBeInTheDocument();
      });
    });
    
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  • expect(queryByText("submit")).toBeNull();
    
    // or, if using jest-dom:
    import "@testing-library/jest-dom";
    expect(queryByText("submit")).not.toBeInTheDocument();
    
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  • test("movie title no longer present in DOM", async () => {
      // element is removed
      await waitForElementToBeRemoved(() =>
        queryByText("the mummy")
      );
    });
    
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