***

title: Write your first test
updated: 2025-12-12T00:00:00.000Z
topictype: tutorial
max-toc-depth: 2
----------------

*API tests* are a way to ensure that your API is behaving as you expect it to. For example, you might write a test to validate your API's error handling by sending a request with incomplete data or wrong parameters. You can write tests for your Postman API requests in JavaScript and add them to individual [requests](/docs/sending-requests/create-requests/create-requests/), [collections](/docs/sending-requests/create-requests/intro-to-collections/), and folders in a collection. Postman includes code snippets you can add and then change to suit your test logic.

To write a test, do the following:

1. Go to the request you made in [Send your first API request](/docs/getting-started/first-steps/sending-the-first-request/).

2. In the request, click the **Scripts** tab, then click **Post-response**.

3. Click <img alt="Code icon" src="https://assets.postman.com/postman-docs/aether-icons/descriptive-code-stroke.svg#icon" width="16px" /> **Snippets** at the lower right of the code editor, then select **Status code: Code is 200**. This will enter the following test code:

   ```javascript
   pm.test("Status code is 200", function () {
       pm.response.to.have.status(200);
   });
   ```

4. Click **Send**.

After the request runs, the test will run. In the response section, click **Test Results** to review the results of your test.

To learn more about writing tests, go to [Write scripts to test API response data in Postman](/docs/tests-and-scripts/write-scripts/test-scripts/).