Test 3-21 - Admin Role User Manages Project Members (DB Mode)
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# Purpose:

To verify that a user with system admin role can add members of various roles to a project. Users are managed locally by Harbor (DB mode).

# References:
User guide

# Environment:
* This test requires that a Harbor instance is running and available.
* Harbor is set to authenticate against a local database. ( auth_mode is set to **db_auth** .) The user data is stored in a local database.
* A linux host with Docker CLI installed (Docker client).
* At least three non-admin users are in Harbor. 
* At least one project that admin user is not a member of.

# Test Steps:

**NOTE:** The below non-admin user M should NOT be the same as the non-admin user in Test 3-11.

1. Assign an non-admin user M with system admin role and act as an admin user. 
2. Repeat all steps in Test 3-11.

# Expected Outcome:

* A user with system admin role can perform all operations the same as the admin user. 
* Same as Test 3-11.

# Possible Problems:
None