1 files changed, 44 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/notification/InjectableSystemClock.java b/services/core/java/com/android/server/notification/InjectableSystemClock.java
new file mode 100644
index 000000000000..4d993d19e57b
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+++ b/services/core/java/com/android/server/notification/InjectableSystemClock.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 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.android.server.notification;
+
+/**
+ * Testable wrapper around {@link android.os.SystemClock}.
+ *
+ * The default implementation at InjectableSystemClockImpl just proxies calls to the real
+ * SystemClock
+ *
+ * In tests, pass an instance of FakeSystemClock, which allows you to control the values returned by
+ * the various getters below.
+ */
+public interface InjectableSystemClock {
+    /** @see android.os.SystemClock#uptimeMillis() */
+    long uptimeMillis();
+
+    /** @see android.os.SystemClock#elapsedRealtime() */
+    long elapsedRealtime();
+
+    /** @see android.os.SystemClock#elapsedRealtimeNanos() */
+    long elapsedRealtimeNanos();
+
+    /** @see android.os.SystemClock#currentThreadTimeMillis() */
+    long currentThreadTimeMillis();
+
+    /** @see System#currentTimeMillis()  */
+    long currentTimeMillis();
+}
+