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  • import { enableProdMode } from "@angular/core";
    import { platformBrowserDynamic } from "@angular/platform-browser-dynamic";
    
    import { AppModule } from "./app/app.module";
    import { environment } from "./environments/environment";
    
    if (environment.production) {
      enableProdMode();
    }
    
    platformBrowserDynamic().bootstrapModule(AppModule);
    
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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("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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  • await fireEvent.touch(getByLabelText("username"));
    
    // Same as:
    await fireEvent.focus(getByLabelText("username"));
    await fireEvent.blur(getByLabelText("username"));
    
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  • // test-utils.js
    const domTestingLib = require("@testing-library/dom");
    const { queryHelpers } = domTestingLib;
    
    export const queryByTestId =
      queryHelpers.queryByAttribute.bind(null, "data-test-id");
    export const queryAllByTestId =
      queryHelpers.queryAllByAttribute.bind(
        null,
        "data-test-id"
      );
    
    export function getAllByTestId(container, id, ...rest) {
      const els = queryAllByTestId(container, id, ...rest);
      if (!els.length) {
        throw queryHelpers.getElementError(
          `Unable to find an element by: [data-test-id="${id}"]`,
          container
        );
      }
      return els;
    }
    
    export function getByTestId(...args) {
      // result >= 1
      const result = getAllByTestId(...args);
      if (result.length > 1) {
        throw queryHelpers.getElementError(
          `Found multiple elements with the [data-test-id="${id}"]`,
          container
        );
      }
      return result[0];
    }
    
    // re-export with overrides
    module.exports = {
      ...domTestingLib,
      getByTestId,
      getAllByTestId,
      queryByTestId,
      queryAllByTestId,
    };
    
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