tests: drop old unittest.main logic

We use pytest now which doesn't need this boilerplate.

Change-Id: Ib71d90b3f1669897814ee768927b5b595ca8d789
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/354355
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
diff --git a/tests/test_git_config.py b/tests/test_git_config.py
index 0df3843..63c148f 100644
--- a/tests/test_git_config.py
+++ b/tests/test_git_config.py
@@ -200,7 +200,3 @@
     for key, value in TESTS:
       self.assertEqual(sync_data[f'{git_config.SYNC_STATE_PREFIX}{key}'], value)
     self.assertTrue(sync_data[f'{git_config.SYNC_STATE_PREFIX}main.synctime'])
-
-
-if __name__ == '__main__':
-  unittest.main()
diff --git a/tests/test_git_superproject.py b/tests/test_git_superproject.py
index 0bb7718..1425f4c 100644
--- a/tests/test_git_superproject.py
+++ b/tests/test_git_superproject.py
@@ -366,7 +366,3 @@
               'revision="52d3c9f7c107839ece2319d077de0cd922aa9d8f"/>'
               '<superproject name="superproject"/>'
               '</manifest>')
-
-
-if __name__ == '__main__':
-  unittest.main()
diff --git a/tests/test_git_trace2_event_log.py b/tests/test_git_trace2_event_log.py
index 7eb5178..7e7dfb7 100644
--- a/tests/test_git_trace2_event_log.py
+++ b/tests/test_git_trace2_event_log.py
@@ -385,7 +385,3 @@
     # Check for 'start' event specific fields.
     self.assertIn('argv', start_event)
     self.assertIsInstance(start_event['argv'], list)
-
-
-if __name__ == '__main__':
-  unittest.main()
diff --git a/tests/test_wrapper.py b/tests/test_wrapper.py
index 372dfcf..2a0e542 100644
--- a/tests/test_wrapper.py
+++ b/tests/test_wrapper.py
@@ -553,7 +553,3 @@
       rrev, lrev = self.wrapper.check_repo_rev(self.GIT_DIR, 'stable', repo_verify=False)
     self.assertEqual('refs/heads/stable', rrev)
     self.assertEqual(self.REV_LIST[1], lrev)
-
-
-if __name__ == '__main__':
-  unittest.main()