minor cleanup and comment.

Author: zhumin8

oauth2_http/javatests/com/google/auth/oauth2/LoggingTest.java

@@ -66,6 +66,11 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * This class contains tests for logging events in each credentials workflow Tests are copied from
+ * credentials test classes with addition of test logging appender setup and test logic for logging.
+ * This duplicates tests setups, but centralizes logging test setup in this class.
+ */
 public class LoggingTest {
 
   private static final Gson gson = new Gson();

oauth2_http/javatests/com/google/auth/oauth2/LoggingUtilsTest.java

@@ -144,12 +144,4 @@ public void testLogGenericData() {
 
     testAppender.stop();
   }
-
-  private TestAppender setupTestLogger(Class<?> clazz) {
-    TestAppender testAppender = new TestAppender();
-    testAppender.start();
-    Logger logger = LoggerFactory.getLogger(clazz);
-    ((ch.qos.logback.classic.Logger) logger).addAppender(testAppender);
-    return testAppender;
-  }
 }