PHPUnit Test to check module is enable or not in Magento 2?

You can write a unit test for your module’s common function to check Module enables or not from a system configuration setting.

Every Professional third party Module contains the Is Active/Is Enable feature for a module from System -> Configuration settings.

To Check module is enable or not, you can write a common function in Helper file or any Common files.

How to prevent the use of ObjectManagaer in the Unit test Magento 2?

Magento 2 with the Unit test for a module, Avoid direct use of Helper\ObjectManager in a Unit test.

Many developers used the native Magento\Framework\TestFramework\Unit\Helper\ObjectManager class for creating mock and objects.

Write Unit test for InputException Error Test in Magento 2.

You can write a  Unit test to check the InputException error text message matched or not using assertEquals() or assertStringMatchesFormat() method for an input exception error.

Let’s take a simple example with a function,