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diff --git a/tests/PackageWatchdog/src/com/android/server/PackageWatchdogTest.java b/tests/PackageWatchdog/src/com/android/server/PackageWatchdogTest.java
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+++ b/tests/PackageWatchdog/src/com/android/server/PackageWatchdogTest.java
@@ -0,0 +1,286 @@
+/*
+ * Copyright (C) 2019 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;
+
+import static com.android.server.PackageWatchdog.TRIGGER_FAILURE_COUNT;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import android.os.test.TestLooper;
+import android.support.test.InstrumentationRegistry;
+
+import com.android.server.PackageWatchdog.PackageHealthObserver;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+// TODO(zezeozue): Write test without using PackageWatchdog#getPackages. Just rely on
+// behavior of observers receiving crash notifications or not to determine if it's registered
+/**
+ * Test PackageWatchdog.
+ */
+public class PackageWatchdogTest {
+    private static final String APP_A = "com.package.a";
+    private static final String APP_B = "com.package.b";
+    private static final String OBSERVER_NAME_1 = "observer1";
+    private static final String OBSERVER_NAME_2 = "observer2";
+    private static final String OBSERVER_NAME_3 = "observer3";
+    private static final long SHORT_DURATION = TimeUnit.SECONDS.toMillis(1);
+    private static final long LONG_DURATION = TimeUnit.SECONDS.toMillis(5);
+    private TestLooper mTestLooper;
+
+    @Before
+    public void setUp() throws Exception {
+        mTestLooper = new TestLooper();
+        mTestLooper.startAutoDispatch();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        new File(InstrumentationRegistry.getContext().getFilesDir(),
+                "package-watchdog.xml").delete();
+    }
+
+    /**
+     * Test registration, unregistration, package expiry and duration reduction
+     */
+    @Test
+    public void testRegistration() throws Exception {
+        PackageWatchdog watchdog = createWatchdog();
+        TestObserver observer1 = new TestObserver(OBSERVER_NAME_1);
+        TestObserver observer2 = new TestObserver(OBSERVER_NAME_2);
+        TestObserver observer3 = new TestObserver(OBSERVER_NAME_3);
+
+        // Start observing for observer1 which will be unregistered
+        watchdog.startObservingHealth(observer1, Arrays.asList(APP_A), SHORT_DURATION);
+        // Start observing for observer2 which will expire
+        watchdog.startObservingHealth(observer2, Arrays.asList(APP_A, APP_B), SHORT_DURATION);
+        // Start observing for observer3 which will have expiry duration reduced
+        watchdog.startObservingHealth(observer3, Arrays.asList(APP_A), LONG_DURATION);
+
+        // Verify packages observed at start
+        // 1
+        assertEquals(1, watchdog.getPackages(observer1).size());
+        assertTrue(watchdog.getPackages(observer1).contains(APP_A));
+        // 2
+        assertEquals(2, watchdog.getPackages(observer2).size());
+        assertTrue(watchdog.getPackages(observer2).contains(APP_A));
+        assertTrue(watchdog.getPackages(observer2).contains(APP_B));
+        // 3
+        assertEquals(1, watchdog.getPackages(observer3).size());
+        assertTrue(watchdog.getPackages(observer3).contains(APP_A));
+
+        // Then unregister observer1
+        watchdog.unregisterHealthObserver(observer1);
+
+        // Verify observer2 and observer3 left
+        // 1
+        assertNull(watchdog.getPackages(observer1));
+        // 2
+        assertEquals(2, watchdog.getPackages(observer2).size());
+        assertTrue(watchdog.getPackages(observer2).contains(APP_A));
+        assertTrue(watchdog.getPackages(observer2).contains(APP_B));
+        // 3
+        assertEquals(1, watchdog.getPackages(observer3).size());
+        assertTrue(watchdog.getPackages(observer3).contains(APP_A));
+
+        // Then advance time a little and run messages in Handlers so observer2 expires
+        Thread.sleep(SHORT_DURATION);
+        mTestLooper.dispatchAll();
+
+        // Verify observer3 left with reduced expiry duration
+        // 1
+        assertNull(watchdog.getPackages(observer1));
+        // 2
+        assertNull(watchdog.getPackages(observer2));
+        // 3
+        assertEquals(1, watchdog.getPackages(observer3).size());
+        assertTrue(watchdog.getPackages(observer3).contains(APP_A));
+
+        // Then advance time some more and run messages in Handlers so observer3 expires
+        Thread.sleep(LONG_DURATION);
+        mTestLooper.dispatchAll();
+
+        // Verify observer3 expired
+        // 1
+        assertNull(watchdog.getPackages(observer1));
+        // 2
+        assertNull(watchdog.getPackages(observer2));
+        // 3
+        assertNull(watchdog.getPackages(observer3));
+    }
+
+    /**
+     * Test package observers are persisted and loaded on startup
+     */
+    @Test
+    public void testPersistence() throws Exception {
+        PackageWatchdog watchdog1 = createWatchdog();
+        TestObserver observer1 = new TestObserver(OBSERVER_NAME_1);
+        TestObserver observer2 = new TestObserver(OBSERVER_NAME_2);
+
+        watchdog1.startObservingHealth(observer1, Arrays.asList(APP_A), SHORT_DURATION);
+        watchdog1.startObservingHealth(observer2, Arrays.asList(APP_A, APP_B), SHORT_DURATION);
+
+        // Verify 2 observers are registered and saved internally
+        // 1
+        assertEquals(1, watchdog1.getPackages(observer1).size());
+        assertTrue(watchdog1.getPackages(observer1).contains(APP_A));
+        // 2
+        assertEquals(2, watchdog1.getPackages(observer2).size());
+        assertTrue(watchdog1.getPackages(observer2).contains(APP_A));
+        assertTrue(watchdog1.getPackages(observer2).contains(APP_B));
+
+
+        // Then advance time and run IO Handler so file is saved
+        mTestLooper.dispatchAll();
+
+        // Then start a new watchdog
+        PackageWatchdog watchdog2 = createWatchdog();
+
+        // Verify the new watchdog loads observers on startup but nothing registered
+        assertEquals(0, watchdog2.getPackages(observer1).size());
+        assertEquals(0, watchdog2.getPackages(observer2).size());
+        // Verify random observer not saved returns null
+        assertNull(watchdog2.getPackages(new TestObserver(OBSERVER_NAME_3)));
+
+        // Then regiser observer1
+        watchdog2.registerHealthObserver(observer1);
+        watchdog2.registerHealthObserver(observer2);
+
+        // Verify 2 observers are registered after reload
+        // 1
+        assertEquals(1, watchdog1.getPackages(observer1).size());
+        assertTrue(watchdog1.getPackages(observer1).contains(APP_A));
+        // 2
+        assertEquals(2, watchdog1.getPackages(observer2).size());
+        assertTrue(watchdog1.getPackages(observer2).contains(APP_A));
+        assertTrue(watchdog1.getPackages(observer2).contains(APP_B));
+    }
+
+    /**
+     * Test package failure under threshold does not notify observers
+     */
+    @Test
+    public void testNoPackageFailureBeforeThreshold() throws Exception {
+        PackageWatchdog watchdog = createWatchdog();
+        TestObserver observer1 = new TestObserver(OBSERVER_NAME_1);
+        TestObserver observer2 = new TestObserver(OBSERVER_NAME_2);
+
+        watchdog.startObservingHealth(observer2, Arrays.asList(APP_A), SHORT_DURATION);
+        watchdog.startObservingHealth(observer1, Arrays.asList(APP_A), SHORT_DURATION);
+
+        // Then fail APP_A below the threshold
+        for (int i = 0; i < TRIGGER_FAILURE_COUNT - 1; i++) {
+            watchdog.onPackageFailure(new String[]{APP_A});
+        }
+
+        // Verify that observers are not notified
+        assertEquals(0, observer1.mFailedPackages.size());
+        assertEquals(0, observer2.mFailedPackages.size());
+    }
+
+    /**
+     * Test package failure and notifies all observer since none handles the failure
+     */
+    @Test
+    public void testPackageFailureNotifyAll() throws Exception {
+        PackageWatchdog watchdog = createWatchdog();
+        TestObserver observer1 = new TestObserver(OBSERVER_NAME_1);
+        TestObserver observer2 = new TestObserver(OBSERVER_NAME_2);
+
+        // Start observing for observer1 and observer2 without handling failures
+        watchdog.startObservingHealth(observer2, Arrays.asList(APP_A), SHORT_DURATION);
+        watchdog.startObservingHealth(observer1, Arrays.asList(APP_A, APP_B), SHORT_DURATION);
+
+        // Then fail APP_A and APP_B above the threshold
+        for (int i = 0; i < TRIGGER_FAILURE_COUNT; i++) {
+            watchdog.onPackageFailure(new String[]{APP_A, APP_B});
+        }
+
+        // Verify all observers are notifed of all package failures
+        List<String> observer1Packages = observer1.mFailedPackages;
+        List<String> observer2Packages = observer2.mFailedPackages;
+        assertEquals(2, observer1Packages.size());
+        assertEquals(1, observer2Packages.size());
+        assertEquals(APP_A, observer1Packages.get(0));
+        assertEquals(APP_B, observer1Packages.get(1));
+        assertEquals(APP_A, observer2Packages.get(0));
+    }
+
+    /**
+     * Test package failure and notifies only one observer because it handles the failure
+     */
+    @Test
+    public void testPackageFailureNotifyOne() throws Exception {
+        PackageWatchdog watchdog = createWatchdog();
+        TestObserver observer1 = new TestObserver(OBSERVER_NAME_1, true /* shouldHandle */);
+        TestObserver observer2 = new TestObserver(OBSERVER_NAME_2, true /* shouldHandle */);
+
+        // Start observing for observer1 and observer2 with failure handling
+        watchdog.startObservingHealth(observer2, Arrays.asList(APP_A), SHORT_DURATION);
+        watchdog.startObservingHealth(observer1, Arrays.asList(APP_A), SHORT_DURATION);
+
+        // Then fail APP_A above the threshold
+        for (int i = 0; i < TRIGGER_FAILURE_COUNT; i++) {
+            watchdog.onPackageFailure(new String[]{APP_A});
+        }
+
+        // Verify only one observer is notifed
+        assertEquals(1, observer1.mFailedPackages.size());
+        assertEquals(APP_A, observer1.mFailedPackages.get(0));
+        assertEquals(0, observer2.mFailedPackages.size());
+    }
+
+    private PackageWatchdog createWatchdog() {
+        return new PackageWatchdog(InstrumentationRegistry.getContext(),
+                mTestLooper.getLooper());
+    }
+
+    private static class TestObserver implements PackageHealthObserver {
+        private final String mName;
+        private boolean mShouldHandle;
+        final List<String> mFailedPackages = new ArrayList<>();
+
+        TestObserver(String name) {
+            mName = name;
+        }
+
+        TestObserver(String name, boolean shouldHandle) {
+            mName = name;
+            mShouldHandle = shouldHandle;
+        }
+
+        public boolean onHealthCheckFailed(String packageName) {
+            mFailedPackages.add(packageName);
+            return mShouldHandle;
+        }
+
+        public String getName() {
+            return mName;
+        }
+    }
+}