@msinnes/dom-testing-library-jest

Jest dependent helpers for use in conjunction with @msinnes/dom-testing-library. The library will not work outside of a jest environment.

Screen Assertions

the render function in the @msinnes/dom-testing-library returns a screen objects, and this library adds some jest matching extensions. Matchers can be run against elements on the screen.

- toBeOnScreen

Checks an element against a screen.

const screen = render(/*some application render*/);
const element = screen.getByText('text');

expect(element).toBeOnScreen(screen);

Will pass the assertion if the element is found on the screen, and will throw an assertion error if the element is not found on the screen.

- toHaveAttribute

Checks an html element for an attribute.

const screen = render(/*some application render*/);
const element = screen.getByText('text');

expect(element).toHaveAttribute('class', 'my-class');

- toHaveAttributes

Checks an html element for a map of attributes.

const screen = render(/*some application render*/);
const element = screen.getByText('text');

expect(element).toHaveAttribute({
  class: 'my-class',
  id: 'element-id',
});