How to test child component method with Enzyme?

jest test child component
enzyme check if child component is rendered
testing react components with jest and enzyme
testing stateless components react enzyme
enzyme shallow find child component
enzyme dive
enzyme mount
enzyme instance

I have a component like that:

<Parent>
  <Child/>
</Parent>

and <Child/> component have a method foo. I want test the foo method but I don't know how to access it. I tried:

mount(<Parent><Child/></Parent>).props().children.foo

or

mount(<Parent><Child/></Parent>).children().foo

but both them are undefined. I can't use .instance() because it's not root. I can't mount <Child/> only because the <Parent> add something (react-router's context.router) on context and I need them when init <Child/>. Any idea with this?

I prefer shallow mount over full mount from enzyme.

In conjunction with proxyquire to resolve child component (which you want to test) I do

wrapper.find('Child1').props().propName

And test it.

Or I use shallow

mount wrapper.dive()

Mocking functions bound to child components · Issue #1432 , I'm new to Enzyme, so probably doing something weird here - all I'm trying to do is to mock a function that is invoked when a button is pressed, e.g.: export default class App extends Mocking functions bound to child components #1432 @​ljharb -- you can do this. it works, I've tested it, errr, in a test. Let’s start with the Search component. You need to create a Search.test.js file in the Search folder. Then we need to import the stuff we need in order to test and configure our Enzyme adapter.

I would consider writing tests for only your parent class, and then a separate test file to only test your child.

Once you have mounted you component using:

const component = mount(<Child>); 

you then have access to it's methods using:

component.instance().methodname

You can then do stuff like override it with jest.fn() and test appropriately.

Testing component methods · Issue #208 · enzymejs/enzyme · GitHub, I'm trying to test this application, but I ran into a wall when testing component methods. As an example, take this component: class Button Enzyme is not installed in create-react-app by default. To install Enzyme and the React adapter for Enzyme: Now, to setup Enzyme in a test file, we import one or both of its renders — mount and shallow — and the React adapter. The React adapter must be added to the Enzyme instance for this scope.

This worked for me:

mount(<Parent><Child/></Parent>).find(Child).instance().foo

How to Test React Components using Jest and Enzyme, This test is a bit different as we are using the mount method from Enzyme. Mount provides full rendering including any child components. I’ll show a few different ways to test the incrementCounter method of the component above, both indirectly and directly. Testing incrementCounter Indirectly. An indirect way of testing the incrementCounter method would be to simulate a click event on the button to which the method is attached using the enzyme wrapper event simulation functionality.

I think your problem is way different from how to test child components.

My first question is: Why are you checking if a child component has a specific method in the parent's component tests?

IMHO you need to have a test specific for this component and, then, in this test you check if the method exists.

Just to not leave without the answer, did you tried .find(Child).instance().foo ?

Testing React Components with Jest and Enzyme- In Depth, Testing React components may be challenging for beginners and Function open() opens popup on child element; click event and function  You can check whether a parent component has rendered its child component using containsMatchingElement(). Based on Enzyme docs : Returns whether or not a patternNode react element matches any element in the render tree.

I was able to get a handle on child function like the following, i was looking for the first child to call the function on -

const component = shallow(<Component />);
component.find(Child).first().getNode().props.someChildFunction()

Enzyme: calling a component method, When writing tests, how can we check that _method can be called? Instance§. With enzyme, you can access the component methods from the  Shallow rendering is the most basic version of testing with Enzyme. As the name suggests, shallow rendering limits it's scope to the component to be tested and not it's children. This comes in handy in various scenarios: For presentational/dummy components that simply render props, there is no need to try and render any other children.

Testing React Components with Enzyme and Jest ― Scotch.io, Enzyme is an open source JavaScript testing utility by Airbnb that makes it fun For components with deeply nested children components, a change in behavior of The test suite imports a shallow enzyme method from the  How to use Enzyme and Jasmine to test that a React component method is called. With enzyme, you can access the component methods from the component instance:

Shallow Rendering · Enzyme, and to ensure that your tests aren't indirectly asserting on behavior of child components. As of Enzyme v3, the shallow API does call React lifecycle methods​  How to mock React component methods with jest and enzyme. Ask Question Asked 3 years, I'm using React 16 and enzyme 3.3.0 but the test doesn't pass.

Fullstack React: Better Testing with Enzyme, We'll use the shallow function exported by Enzyme to mount our component. Again, since we're testing against a child element in our Timeline, we'll have to  Without the serializer each time a component is created in a test it must have the enzyme-to-json method .toJson() used individually before it can be passed to Jest’s snapshot matcher, with the

Comments
  • It's seems this is still not possible or at least complicated: github.com/airbnb/enzyme/issues/361
  • Test the react components lower down in the tree before working your way up. Also export an unwrapped version of your component for tests in order to remove the dependency of the component on react router.
  • +1 most annoying thing about writing react specs, I don't understand how you could write a spec framework for react and not have an easy way to access instances of child components. dumb.
  • This is not possible anymore from React 16.x
  • Instance can only be called on root.
  • .instance() can only be called on the "root"
  • .instance() can only be called on "root"