@testing-library/react

  • Version 13.4.0
  • Published
  • 4.02 MB
  • 3 dependencies
  • MIT license

Install

npm i @testing-library/react
yarn add @testing-library/react
pnpm add @testing-library/react

Overview

Simple and complete React DOM testing utilities that encourage good testing practices.

Index

Variables

variable act

const act: any;
  • Simply calls ReactDOMTestUtils.act(cb) If that's not available (older version of react) then it simply calls the given callback immediately

Functions

function cleanup

cleanup: () => void;
  • Unmounts React trees that were mounted with render.

function render

render: {
<
Q extends Queries = any,
Container extends Element | DocumentFragment = HTMLElement,
BaseElement extends Element | DocumentFragment = Container
>(
ui: React.ReactElement,
options: RenderOptions<Q, Container, BaseElement>
): RenderResult<Q, Container, BaseElement>;
(
ui: React.ReactElement,
options?: Omit<RenderOptions<any, HTMLElement, HTMLElement>, 'queries'>
): any;
};
  • Render into a container which is appended to document.body. It should be used with cleanup.

function renderHook

renderHook: <
Result,
Props,
Q extends Queries = any,
Container extends Element | DocumentFragment = HTMLElement,
BaseElement extends Element | DocumentFragment = Container
>(
render: (initialProps: Props) => Result,
options?: RenderHookOptions<Props, Q, Container, BaseElement>
) => RenderHookResult<Result, Props>;
  • Allows you to render a hook within a test React component without having to create that component yourself.

Interfaces

interface RenderHookOptions

interface RenderHookOptions<
Props,
Q extends Queries = typeof queries,
Container extends Element | DocumentFragment = HTMLElement,
BaseElement extends Element | DocumentFragment = Container
> extends RenderOptions<Q, Container, BaseElement> {}

    property initialProps

    initialProps?: Props;
    • The argument passed to the renderHook callback. Can be useful if you plan to use the rerender utility to change the values passed to your hook.

    interface RenderHookResult

    interface RenderHookResult<Result, Props> {}

      property rerender

      rerender: (props?: Props) => void;
      • Triggers a re-render. The props will be passed to your renderHook callback.

      property result

      result: {
      /**
      * The value returned by your renderHook callback
      */
      current: Result;
      };
      • This is a stable reference to the latest value returned by your renderHook callback

      property unmount

      unmount: () => void;
      • Unmounts the test component. This is useful for when you need to test any cleanup your useEffects have.

      interface RenderOptions

      interface RenderOptions<
      Q extends Queries = typeof queries,
      Container extends Element | DocumentFragment = HTMLElement,
      BaseElement extends Element | DocumentFragment = Container
      > {}

        property baseElement

        baseElement?: BaseElement;
        • Defaults to the container if the container is specified. Otherwise document.body is used for the default. This is used as the base element for the queries as well as what is printed when you use debug().

          See Also

          • https://testing-library.com/docs/react-testing-library/api/#baseelement

        property container

        container?: Container;
        • By default, React Testing Library will create a div and append that div to the document.body. Your React component will be rendered in the created div. If you provide your own HTMLElement container via this option, it will not be appended to the document.body automatically.

          For example: If you are unit testing a <tbody> element, it cannot be a child of a div. In this case, you can specify a table as the render container.

          See Also

          • https://testing-library.com/docs/react-testing-library/api/#container

        property hydrate

        hydrate?: boolean;
        • If hydrate is set to true, then it will render with ReactDOM.hydrate. This may be useful if you are using server-side rendering and use ReactDOM.hydrate to mount your components.

          See Also

          • https://testing-library.com/docs/react-testing-library/api/#hydrate)

        property legacyRoot

        legacyRoot?: boolean;
        • Set to true if you want to force synchronous ReactDOM.render. Otherwise render will default to concurrent React if available.

        property queries

        queries?: Q;
        • Queries to bind. Overrides the default set from DOM Testing Library unless merged.

          See Also

          • https://testing-library.com/docs/react-testing-library/api/#queries

        property wrapper

        wrapper?: React.JSXElementConstructor<{ children: React.ReactElement }>;
        • Pass a React Component as the wrapper option to have it rendered around the inner element. This is most useful for creating reusable custom render functions for common data providers. See setup for examples.

          See Also

          • https://testing-library.com/docs/react-testing-library/api/#wrapper

        Type Aliases

        type RenderResult

        type RenderResult<
        Q extends Queries = typeof queries,
        Container extends Element | DocumentFragment = HTMLElement,
        BaseElement extends Element | DocumentFragment = Container
        > = {
        container: Container;
        baseElement: BaseElement;
        debug: (
        baseElement?: Element | DocumentFragment | Array<Element | DocumentFragment>,
        maxLength?: number,
        options?: prettyFormat.OptionsReceived
        ) => void;
        rerender: (ui: React.ReactElement) => void;
        unmount: () => void;
        asFragment: () => DocumentFragment;
        } & { [P in keyof Q]: BoundFunction<Q[P]> };

          Package Files (1)

          Dependencies (3)

          Dev Dependencies (8)

          Peer Dependencies (2)

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