Use assertIn in corpus_test.py (#147)

Author: mtrofin

compiler_opt/rl/corpus_test.py

@@ -197,8 +197,8 @@ def test_cmd_override_thinlto(self):
         cmdline=('-something',),
         cmdline_is_override=True,
         is_thinlto=True)
-    self.assertTrue('-fthinlto-index={context.thinlto_full_path}' in
-                    cps.module_specs[0].command_line)
+    self.assertIn('-fthinlto-index={context.thinlto_full_path}',
+                  cps.module_specs[0].command_line)
     self.assertEqual(cps.module_specs[0].command_line[-6:],
                      ('-x', 'ir', '{context.module_full_path}',
                       '-fthinlto-index={context.thinlto_full_path}', '-mllvm',