IOPT test cases can be found in the IOPT Test Suite beginning in section 4.3. Some IOPT test case IDs are mapped to a set of test cases from another test suite.
In the example below, IOPT/HAS/SR/GATTDB/BV-01-I [GATT service verification – HAS] maps to the following test cases from Hearing Access Service (HAS): HAS/SR/SGGIT/SER/BV-01-C, HAS/SR/SGGIT/CHA/BV-01-C, HAS/SR/SGGIT/CHA/BV-02-C, HAS/SR/SGGIT/CHA/BV-03-C, HAS/SR/SGGIT/CHA/BV-04-C.
The column on the far right (Baseline/Additional) indicates whether there are additional ICS items that need to be supported in order to execute that test case. Please see the test suite for the referenced specification for more information regarding that test case.