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ReactJS TestRenderer.create() Method

  • Last Updated : 03 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 TestRenderer.create() method. This method is used to create a TestRenderer instance with the passed React element.

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
  • Step 3: Install the required module using the following command.

    npm install react-test-renderer

Project Structure: It will look like the following.

Example 1: 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.create() method
  function testRenderFun() {
    const renderer = TestRenderer.create(
      <div>GeeksforGeeks
      TestRenderer.create() method
      </div>
    );
    console.log(renderer);
  }
  
  // Function Call
  testRenderFun();
  
  // Returning our JSX code
  return <>
    <p>
      GeeksforGeeks TestRenderer.create() method
    </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:

Example 2: 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.create() method
  function testRenderFun() {
    const renderer = TestRenderer.create(
      <div>GeeksforGeeks
      TestRenderer.create() method
      </div>
    );
  
    // Calling toJSON function to our rendered object
    console.log(renderer.toJSON());
  }
  
  // Function Call
  testRenderFun();
  
  // Returning our JSX code
  return <>
    <p>
      GeeksforGeeks TestRenderer.create() method
    </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#testrenderercreate




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