Introducing DoNotMock

MOE_MIGRATED_REVID=126245833

annotations/src/main/java/com/google/errorprone/annotations/DoNotMock.java

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+/*
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * 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.errorprone.annotations;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({
+  ElementType.TYPE,
+  ElementType.ANNOTATION_TYPE
+})
+public @interface DoNotMock {
+  /**
+   * The reason why the annotated type should not be mocked.
+   *
+   * <p>This should suggest alternative APIs to use for testing objects of this type.
+   */
+  String value();
+}