Use one reflection util to assert all preferences

Reflection code to assert diff preferences existed twice and to assert
general preferences relection should be used as well.

Change-Id: I761909f929569f53ea0714d7c5403198a6c88ca5
Signed-off-by: Edwin Kempin <ekempin@google.com>

gerrit-acceptance-framework/src/test/java/com/google/gerrit/acceptance/AssertUtil.java

@@ -0,0 +1,47 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance;
+
+import static com.google.common.truth.Truth.assertWithMessage;
+import static com.google.gerrit.server.config.ConfigUtil.skipField;
+
+import java.lang.reflect.Field;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+public class AssertUtil {
+  public static <T> void assertPrefs(T actual, T expected,
+      String... fieldsToExclude)
+          throws IllegalArgumentException, IllegalAccessException {
+    Set<String> exludedFields = new HashSet<>(Arrays.asList(fieldsToExclude));
+    for (Field field : actual.getClass().getDeclaredFields()) {
+      if (exludedFields.contains(field.getName()) || skipField(field)) {
+        continue;
+      }
+      Object actualVal = field.get(actual);
+      Object expectedVal = field.get(expected);
+      if (field.getType().isAssignableFrom(Boolean.class)) {
+        if (actualVal == null) {
+          actualVal = false;
+        }
+        if (expectedVal == null) {
+          expectedVal = false;
+        }
+      }
+      assertWithMessage(field.getName()).that(actualVal).isEqualTo(expectedVal);
+    }
+  }
+}