> ## Documentation Index
> Fetch the complete documentation index at: https://langtail.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Basic Tests

[Here is a prompt](https://app.langtail.com/playground?shareid=U_-cFxHZwq) that that analyzes the sentiment of some text and returns a JSON object containing that sentiment. Here's what a basic set of tests could look like:

<img src="https://mintcdn.com/langtail-64/p9EXZCG0ePxqdlKP/images/tests/overview/screenshot.png?fit=max&auto=format&n=p9EXZCG0ePxqdlKP&q=85&s=82725d421f01f2c71ca9634b89f037b7" alt="Screenshot of Langtail's test section" width="1400" height="982" data-path="images/tests/overview/screenshot.png" />

1. **Test 1 - Positive Sentiment**
   * **Case**: "I am happy."
   * **Assertion**: An *equals* assertion with the value `{"sentiment": "positive"}`
2. **Test 2 - Positive Sentiment**
   * **Case**: "I am sad."
   * **Assertion**: An *equals* assertion with the value `{"sentiment": "negative"}`
3. **Test 3 - Is Valid JSON**
   * **Case**: "I saw a blue car."
   * **Assertion**: A *javascript* assertion with the following code:
     ```javascript theme={null}
     test(async ({ message, variables }) => {
       try {
             JSON.parse(message.content);
             return true; // Parsing succeeded, so it's valid JSON
         } catch (e) {
             return false; // Parsing failed, so it's not valid JSON
         }
     });
     ```

There's a lot more that could be tested, but having even a basic test suite for each of your prompts can be a great way to safeguard against typos (like misspelling "positive") or parameter changes (like turning off JSON mode).

<Tip>For more comprehensive testing scenarios and advanced configurations, explore our in-depth guide on [advanced testing](/concepts-and-examples/tests/adv-tests) techniques.</Tip>

If you have any questions regarding tests or best practices for your project, [get in touch with us](/support/get-help).