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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