containsMatchingElement.md

.containsMatchingElement(patternNode) => Boolean

Returns whether or not a patternNode react element matches any element in the render tree.

• the matches can happen anywhere in the wrapper's contents
• the wrapper can contain more than one node; all are searched

Otherwise, the match follows the same rules as matchesElement.

Arguments

1. patternNode (ReactElement): The node whose presence you are detecting in the current instance's render tree.

Returns

Boolean: whether or not the current wrapper has a node anywhere in its render tree that matches the one passed in.

Example

const wrapper = shallow((
  <div>
    <div data-foo="foo" data-bar="bar">Hello</div>
  </div>
));

expect(wrapper.containsMatchingElement(<div data-foo="foo" data-bar="bar">Hello</div>)).to.equal(true);
expect(wrapper.containsMatchingElement(<div data-foo="foo">Hello</div>)).to.equal(true);

expect(wrapper.containsMatchingElement(<div data-foo="foo" data-bar="bar" data-baz="baz">Hello</div>)).to.equal(false);
expect(wrapper.containsMatchingElement(<div data-foo="foo" data-bar="Hello">Hello</div>)).to.equal(false);
expect(wrapper.containsMatchingElement(<div data-foo="foo" data-bar="bar" />)).to.equal(false);

Common Gotchas

• .containsMatchingElement() expects a ReactElement, not a selector (like many other methods). Make sure that when you are calling it you are calling it with a ReactElement or a JSX expression.
• Keep in mind that this method determines equality based on the equality of the node's children as well.

Related Methods

• .containsAllMatchingElements() => ShallowWrapper - must match all nodes in patternNodes
• .containsAnyMatchingElements() => ShallowWrapper - must match at least one in patternNodes