UI test

// For usage information, see the README.md file.
import { createRoot } from "react-dom/client";
import { App } from "./app";
import "@canva/app-ui-kit/styles.css";
import { AppUiProvider } from "@canva/app-ui-kit";
import { addElementAtPoint } from "@canva/design";

const root = createRoot(document.getElementById("root") as Element);
function render() {
  root.render(
    <AppUiProvider>
      {/* Any Apps SDK method needs to be injected to the component, to avoid the need to mock it in tests */}
      <App
        onClick={() =>
          addElementAtPoint({
            type: "text",
            children: ["Hello world!"],
          })
        }
      />
    </AppUiProvider>,
  );
}

render();

// Hot Module Replacement for development (automatically reloads the app when changes are made)
if (module.hot) {
  module.hot.accept("./app", render);
}

// For usage information, see the README.md file.

// Import Canva SDK testing utilities
import * as asset from "@canva/asset/test";
import * as design from "@canva/design/test";
import * as error from "@canva/error/test";
import * as platform from "@canva/platform/test";
import * as user from "@canva/user/test";

/*
  Initialize test environments for each Canva SDK package
  This sets up the necessary test infrastructure before mocking the actual SDK methods
*/
asset.initTestEnvironment();
design.initTestEnvironment();
error.initTestEnvironment();
platform.initTestEnvironment();
user.initTestEnvironment();

/*
  Mock all Canva SDK packages except @canva/error
  This allows tests to run without making real API calls to Canva's services
*/
jest.mock("@canva/asset");
jest.mock("@canva/design");
jest.mock("@canva/platform");
jest.mock("@canva/user");

/*
  Important: @canva/error should not be mocked
  Use it to simulate API error responses from other mocks by throwing CanvaError instances
  This allows testing of error handling scenarios
*/

// For usage information, see the README.md file.
import { fireEvent, render } from "@testing-library/react";
import { TestAppUiProvider } from "@canva/app-ui-kit";
import { App } from "../app";

describe("app", () => {
  let addElementAtPoint: jest.Mock;

  beforeEach(() => {
    // Create a fresh mock for each test to avoid test interdependency
    addElementAtPoint = jest.fn();
  });

  it("calls addElementAtPoint onClick", async () => {
    const result = render(
      /*
        TestAppUiProvider is used instead of AppUiProvider in tests
        It provides the same theming and context without browser-specific features
        The theme prop allows testing both light and dark mode appearances
      */
      <TestAppUiProvider theme="dark">
        <App onClick={addElementAtPoint} />
      </TestAppUiProvider>,
    );

    // Get reference to the button using accessible role selector
    const button = result.getByRole("button");

    // Verify button text content matches expected value
    expect(button.textContent).toEqual("Do something cool");
    // Verify the Canva SDK method hasn't been called yet
    expect(addElementAtPoint).not.toHaveBeenCalled();

    // Simulate user clicking the button
    fireEvent.click(button);

    // Verify the Canva SDK method was called exactly once
    expect(addElementAtPoint).toHaveBeenCalledTimes(1);
  });

  it("Renders 🎉", () => {
    const result = render(
      /*
        Snapshot testing ensures UI doesn't change unexpectedly
        TestAppUiProvider ensures consistent rendering across test environments
      */
      <TestAppUiProvider theme="dark">
        <App onClick={addElementAtPoint} />
      </TestAppUiProvider>,
    );

    // Compare rendered output against saved snapshot
    expect(result.container).toMatchSnapshot();
  });
});

# UI testing

Demonstrates how to set up and write tests for app UI components using standard testing frameworks. Shows basic component testing patterns and provides a foundation for testing user interactions.

For API reference docs and instructions on running this example, see: <https://www.canva.dev/docs/apps/examples/ui-test/>.

Related example: See testing/unit_test for testing app logic and business functions separately from UI.

NOTE: This example differs from what is expected for public apps to pass a Canva review:

- Error handling is simplified for demonstration. Production apps must implement comprehensive error handling with clear user feedback and graceful failure modes
- Internationalization is not implemented. Production apps must support multiple languages using the `@canva/app-i18n-kit` package to pass Canva review requirements