> For the complete documentation index, see [llms.txt](https://docs.langstack.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.langstack.com/welcome/get-started/learn-langstack/validation-pipeline/exercise-customer-information/step-3-test-the-validation-pipeline.md).

# Step 3: Test the Validation pipeline

To see the working of the Validation pipeline, follow the steps below.

* To test the validation, in the Validation pipeline “UserName\_Acc\_customers\_validation”, click the \[Test] button.

<figure><img src="https://media.langstack.com/documentation/media/images/code/training_manual/chapter_11/ch11testval.png" alt=""><figcaption></figcaption></figure>

* In the Test Console, enter the mandatory values in the displayed fields. When all the values are entered, click the \[Test] button. Success message displays.

<figure><img src="https://media.langstack.com/documentation/media/images/code/training_manual/chapter_11/ch11testvalform1.png" alt=""><figcaption></figcaption></figure>

<figure><img src="https://media.langstack.com/documentation/media/images/code/training_manual/chapter_11/ch11valsuccess.png" alt=""><figcaption></figcaption></figure>

* To test the error message for an empty mandatory field, remove the Last Name value and click the \[Test] button. The corresponding error message is displayed.

![](/files/ep4aFgsUHm4V6v8w8ayE)

* To test the error message for an incorrect phone number field, enter a number less than eight (8) and click the \[Test] button. The corresponding error message is displayed.

<figure><img src="https://media.langstack.com/documentation/media/images/code/training_manual/chapter_11/ch11invphoneerr.png" alt=""><figcaption></figcaption></figure>