Merge "Create MemoryTrackingTestCase for convenient heap dumping" into tm-qpr-dev

packages/SystemUI/tests/utils/src/com/android/systemui/MemoryTrackingTestCase.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2022 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.systemui;
+
+import android.os.Debug;
+import android.util.Log;
+
+import org.junit.AfterClass;
+import org.junit.Before;
+
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Convenience class for grabbing a heap dump after a test class is run.
+ *
+ * To use:
+ * - locally edit your test class to inherit from MemoryTrackingTestCase instead of SysuiTestCase
+ * - Watch the logcat with tag MEMORY to see the path to the .ahprof file
+ * - adb pull /path/to/something.ahprof
+ * - Download ahat from https://sites.google.com/corp/google.com/ahat/home
+ * - java -jar ~/Downloads/ahat-1.7.2.jar something.hprof
+ * - Watch output for next steps
+ * - Profit and fix leaks!
+ */
+public class MemoryTrackingTestCase extends SysuiTestCase {
+    private static File sFilesDir = null;
+    private static String sLatestTestClassName = null;
+
+    @Before public void grabFilesDir() {
+        if (sFilesDir == null) {
+            sFilesDir = mContext.getFilesDir();
+        }
+        sLatestTestClassName = getClass().getName();
+    }
+
+    @AfterClass
+    public static void dumpHeap() throws IOException {
+        if (sFilesDir == null) {
+            Log.e("MEMORY", "Somehow no test cases??");
+            return;
+        }
+        mockitoTearDown();
+        Log.w("MEMORY", "about to dump heap");
+        File path = new File(sFilesDir, sLatestTestClassName + ".ahprof");
+        Debug.dumpHprofData(path.getPath());
+        Log.w("MEMORY", "did it!  Location: " + path);
+    }
+}