Default test to AndroidJUnitTest for auto-generated test config.

All new instrumentation tests shall use AndroidJUnitRunner, thus default
test class to AndroidJUnitTest.

Bug: 73679956
Test: unittest
Change-Id: I52df4d01b8459a4a6e5c2cbe15973dab079fb136
diff --git a/tools/auto_gen_test_config_test.py b/tools/auto_gen_test_config_test.py
index e70eff8..e68c27f 100644
--- a/tools/auto_gen_test_config_test.py
+++ b/tools/auto_gen_test_config_test.py
@@ -155,7 +155,7 @@
       self.assertEqual(config_file.read(), EXPECTED_JUNIT_TEST_CONFIG)
 
   def testCreateInstrumentationTestConfig(self):
-    """Test creating test config for AndroidJUnitTest.
+    """Test creating test config for InstrumentationTest.
     """
     with open(self.manifest_file, 'w') as f:
       f.write(MANIFEST_INSTRUMENTATION_TEST)