Use match instead of search

Author: schedutron

script/validators/source_validator.py

@@ -223,7 +223,7 @@ def check_tests(file_path):
 
             else:
                 # Check test case names.
-                case_found = TEST_CASE_PATT.search(line)
+                case_found = TEST_CASE_PATT.match(line)
                 if case_found and not case_found.groups()[1].endswith('Test'):
                     if test_status:
                         LOG.info("Invalid test name in %s", file_path)