react.dev/docs/09.4-test-utils.md

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test-utils	Test Utilities	docs	test-utils.html	class-name-manipulation.html	examples.html

React.addons.TestUtils makes it easy to test React components in the testing framework of your choice (we use Jasmine with jsdom).

ReactComponent renderIntoDocument(ReactComponent instance)

Render a component into a detached DOM node in the document. This function requires a DOM.

boolean isComponentOfType(ReactComponent instance, function componentClass)

Returns true if instance is an instance of a React componentClass.

boolean isDOMComponent(ReactComponent instance)

Returns true if instance is a DOM component (such as a <div> or <span>).

boolean isCompositeComponent(ReactComponent instance)`

Returns true if instance is a composite component (created with React.createClass())

boolean isCompositeComponentWithType(ReactComponent instance, function componentClass)

The combination of isComponentOfType() and isCompositeComponent().

boolean isTextComponent(ReactComponent instance)

Returns true if instance is a plain text component.

array findAllInRenderedTree(ReactComponent tree, function test)

Traverse all components in tree and accumulate all components where test(component) is true. This is not that useful on its own, but it's used as a primitive for other test utils.

array scryRenderedDOMComponentsWithClass(ReactCompoennt tree, string className)

Finds all instance of components in the rendered tree that are DOM components with the class name matching className.

ReactComponent findRenderedDOMComponentWithClass(ReactComponent tree, string className)

Like scryRenderedDOMComponentsWithClass() but expects there to be one result, and returns that one result, or throws exception if there is any other number of matches besides one.

array scryRenderedDOMComponentsWithTag(ReactComponent tree, string tagName)

Finds all instance of components in the rendered tree that are DOM components with the tag name matching tagName.

ReactComponent findRenderedDOMComponentWithTag(ReactComponent tree, string tagName)

Like scryRenderedDOMComponentsWithTag() but expects there to be one result, and returns that one result, or throws exception if there is any other number of matches besides one.

array scryRenderedComponentsWithType(ReactComponent tree, function componentClass)

Finds all instances of components with type equal to componentClass.

ReactComponent findRenderedComponentWithType(ReactComponent tree, function componentClass)

Same as scryRenderedComponentsWithType() but expects there to be one result and returns that one result, or throws exception if there is any other number of matches besides one.

object mockComponent(function componentClass, string? tagName)

Pass a mocked component module to this method to augment it with useful methods that allow it to be used as a dummy React component. Instead of rendering as usual, the component will become a simple <div> (or other tag if mockTagName is provided) containing any provided children.

Simulate.{eventName}({ReactComponent|DOMElement} element, object nativeEventData)

Simulate an event dispatch on a React component instance or browser DOM node with optional nativeEventData event data. This is possibly the single most useful utility in ReactTestUtils.

Note:

This helper is used to simulate browser events, so synthetic React events like change are not available. If you want to test change, simulate the underlying input browser event.

Example usage: React.addons.TestUtils.Simulate.click(myComponent)

Simulate has a method for every event that React understands.