Example:

create or replace package tst_part is
  --%suite
  
  --%test
  procedure test_1;
  
  --%test
  procedure test_12;
end;
/

create or replace package body tst_part is
  procedure test_1 is
  begin
    ut.expect(1).to_equal(1);
  end;
  procedure test_12 is
  begin
    ut.expect(1).to_equal(2);
  end;
end;
/

exec ut.run('tst_part.test_1');

Results in:

tst_part
  test_1 [.006 sec]
  test_12 [.099 sec] (FAILED - 1)
 
Failures:
 
  1) test_12
      Actual: 1 (number) was expected to equal: 2 (number) 
      at "UT3_TESTER.TST_PART", line 8 ut.expect(1).to_equal(2);
      
       
Finished in .109422 seconds
2 tests, 1 failed, 0 errored, 0 disabled, 0 warning(s)

Procedure test_12 gets executed while it should not.

The functionality works correctly, when invoking packages.
So if I create a copy of package tst_part and name it tst_part_1, calling: exec ut.run('tst_part'); is working fine and only procedures from package tst_part are executed.