Running Unit Tests in Magento2 using CLI command

Running all unit tests

• Navigate to your Magento root directory.
• Run the below command, where c option specifies the path to the phpunit configuration file

./vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist

Running only a subset of the unit tests

• For running unit tests only for a single module use the below command.

./vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist app/code/Example/Module/Test/Unit

• You need to specify your module directory as shown in the above code snippet.
• After that, the phpunit will scan the directory for files ending with Test.php and try to execute them.

You can visit the following blog for creating the unit test.