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ReactJS testInstance.type Property

  • Last Updated : 17 Jun, 2021

React.js library is all about splitting the app into several components. Each Component has its own lifecycle. React provides us some in-built methods that we can override at particular stages in the life-cycle of the component.

In this article, we will know how to use testInstance.type property. This property is used to get a component type which is corresponding to the test instance.

Creating React Application And Installing Module:

  • Step 1: Create a React application using the following command

    npx create-react-app foldername

     



  • Step 2: After creating your project folder i.e. foldername, move to it using the following command.

    cd foldername

Project Structure: It will look like the following.

Example: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

App.js




import React from 'react';
import TestRenderer from 'react-test-renderer';
  
// Defining our App Component
const App = () => {
  
  // Function to demonstrate TestRenderer.type Property
  function testRenderFun() {
    const renderer = TestRenderer.create(
      <div>GeeksforGeeks TestRenderer.type Property</div>
    );
    const mytype = renderer.root;
    console.log(mytype.type);
  }
  
  // Function Call
  testRenderFun();
  
  // Returning our JSX code
  return <>
    <p>
      GeeksforGeeks TestRenderer.type Property
    </p>
  
  </>;
}
  
// Exporting your Default App Component
export default App

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output:

Reference: https://reactjs.org/docs/test-renderer.html#testinstancetype

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