Add comments to TestGetMountRoot in pkg\ddc\alluxio\utils_test.go.

[moonmoonbirdfly]

Which function do you want to add comments to?

TestGetMountRoot in pkg\ddc\alluxio\utils_test.go.

What comments do you want to add?

// TestGetMountRoot tests the function that retrieves the mount root directory. // It checks if the function correctly returns the expected mount root path based on the environment variable MOUNT_ROOT. // The test sets the MOUNT_ROOT environment variable to a specific path and verifies that the function returns the correct mount root path.revise twice. // The expected mount root path is constructed by appending "/alluxio" to the value of MOUNT_ROOT.