[#12048] Migrate tests for GetAccountActionTest

[mingyang143]

Part of #12048

Outline of Solution
Change GetAccountActionTest.java to ensure compatibility with the PostgreSQL database following the database migration.

[DhiraPT]

Overall, the changes look good! The implementation is clear, and the tests cover the main functionality well. Consider adding a few additional tests to improve coverage and refining the test method name for better clarity. Great work so far!

[DhiraPT]

1. Adding a Test for Missing Parameters
   The execute() method in GetAccountAction requires non-null Instructor ID parameter. Would it be helpful to add a test case to ensure the method handles missing parameters correctly? For example:

   @Test
   void testExecute_noParameters_throwsInvalidHttpParameterException() {
       verifyHttpParameterFailure();
   }
   

2. Access Control Test Cases
   Since GetAccountAction extends AdminOnlyAction, do you think it would be beneficial to include tests that verify access control? This can ensure only admins have access to the action. Some possible test cases could be:

   @Test
   void testSpecificAccessControl_admin_canAccess() { ... }
   
   @Test
   void testSpecificAccessControl_instructor_cannotAccess() { ... }
   
   @Test
   void testSpecificAccessControl_student_cannotAccess() { ... }
   
   @Test
   void testSpecificAccessControl_loggedOut_cannotAccess() { ... }
   

[DhiraPT]

The current method name testExecute_accountDoesNotExist_failSilently() might not fully reflect the behavior, as the method throws an exception rather than failing silently. Would something like testExecute_accountDoesNotExist_throwsEntityNotFoundException() be clearer?

[dishenggg]

good catch!