in teamcity/unittestpy.py [0:0]
def get_subtest_block_id(self, test, subtest):
test_id = self.get_test_id_with_description(test)
subtest_id = self.get_test_id_with_description(subtest)
if subtest_id.startswith(test_id):
block_id = subtest_id[len(test_id):].strip()
else:
block_id = subtest_id
if len(block_id) == 0:
block_id = test_id
return block_id