diff --git a/sample_updater/tests/Android.mk b/sample_updater/tests/Android.mk
new file mode 100644
index 0000000..1ec68b9
--- /dev/null
+++ b/sample_updater/tests/Android.mk
@@ -0,0 +1,32 @@
+#
+# Copyright (C) 2018 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.
+#
+
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_PACKAGE_NAME := SystemUpdaterSampleTests
+LOCAL_SDK_VERSION := system_current
+LOCAL_MODULE_TAGS := tests
+LOCAL_JAVA_LIBRARIES := \
+    android.test.runner \
+    android.test.base
+LOCAL_STATIC_JAVA_LIBRARIES := android-support-test
+LOCAL_INSTRUMENTATION_FOR := SystemUpdaterSample
+LOCAL_PROGUARD_ENABLED := disabled
+
+LOCAL_SRC_FILES := $(call all-subdir-java-files)
+
+include $(BUILD_PACKAGE)
diff --git a/sample_updater/tests/AndroidManifest.xml b/sample_updater/tests/AndroidManifest.xml
new file mode 100644
index 0000000..145576c
--- /dev/null
+++ b/sample_updater/tests/AndroidManifest.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="com.example.android.systemupdatersample.tests">
+
+    <!-- We add an application tag here just so that we can indicate that
+         this package needs to link against the android.test library,
+         which is needed when building test cases. -->
+    <application>
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <instrumentation android:name="android.support.test.runner.AndroidJUnitRunner"
+                     android:targetPackage="com.example.android.systemupdatersample"
+                     android:label="Tests for SampleUpdater."/>
+
+</manifest>
diff --git a/sample_updater/tests/build.properties b/sample_updater/tests/build.properties
new file mode 100644
index 0000000..e0c39de
--- /dev/null
+++ b/sample_updater/tests/build.properties
@@ -0,0 +1 @@
+tested.project.dir=..
diff --git a/sample_updater/tests/src/com/example/android/systemupdatersample/UpdateConfigTest.java b/sample_updater/tests/src/com/example/android/systemupdatersample/UpdateConfigTest.java
new file mode 100644
index 0000000..8715371
--- /dev/null
+++ b/sample_updater/tests/src/com/example/android/systemupdatersample/UpdateConfigTest.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2018 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.example.android.systemupdatersample;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertSame;
+
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+
+/**
+ * Tests for {@link UpdateConfig}
+ */
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class UpdateConfigTest {
+
+    private static final String JSON_NON_STREAMING =
+            "{\"name\": \"vip update\", \"url\": \"file:///builds/a.zip\", "
+            + " \"type\": \"NON_STREAMING\"}";
+
+    private static final String JSON_STREAMING =
+            "{\"name\": \"vip update 2\", \"url\": \"http://foo.bar/a.zip\", "
+            + "\"type\": \"STREAMING\"}";
+
+    @Rule
+    public final ExpectedException thrown = ExpectedException.none();
+
+    @Test
+    public void fromJson_parsesJsonConfigWithoutMetadata() throws Exception {
+        UpdateConfig config = UpdateConfig.fromJson(JSON_NON_STREAMING);
+        assertEquals("name is parsed", "vip update", config.getName());
+        assertEquals("stores raw json", JSON_NON_STREAMING, config.getRawJson());
+        assertSame("type is parsed", UpdateConfig.TYPE_NON_STREAMING, config.getInstallType());
+        assertEquals("url is parsed", "file:///builds/a.zip", config.getUrl());
+    }
+
+    @Test
+    public void getUpdatePackageFile_throwsErrorIfStreaming() throws Exception {
+        UpdateConfig config = UpdateConfig.fromJson(JSON_STREAMING);
+        thrown.expect(RuntimeException.class);
+        config.getUpdatePackageFile();
+    }
+
+    @Test
+    public void getUpdatePackageFile_throwsErrorIfNotAFile() throws Exception {
+        String json = "{\"name\": \"upd\", \"url\": \"http://foo.bar\","
+                + " \"type\": \"NON_STREAMING\"}";
+        UpdateConfig config = UpdateConfig.fromJson(json);
+        thrown.expect(RuntimeException.class);
+        config.getUpdatePackageFile();
+    }
+
+    @Test
+    public void getUpdatePackageFile_works() throws Exception {
+        UpdateConfig c = UpdateConfig.fromJson(JSON_NON_STREAMING);
+        assertEquals("correct path", "/builds/a.zip", c.getUpdatePackageFile().getAbsolutePath());
+    }
+
+}
diff --git a/sample_updater/tests/src/com/example/android/systemupdatersample/ui/MainActivityTest.java b/sample_updater/tests/src/com/example/android/systemupdatersample/ui/MainActivityTest.java
new file mode 100644
index 0000000..0101416
--- /dev/null
+++ b/sample_updater/tests/src/com/example/android/systemupdatersample/ui/MainActivityTest.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 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.example.android.systemupdatersample.ui;
+
+import static org.junit.Assert.assertNotNull;
+
+import android.support.test.filters.MediumTest;
+import android.support.test.rule.ActivityTestRule;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Make sure that the main launcher activity opens up properly, which will be
+ * verified by {@link #activityLaunches}.
+ */
+@RunWith(AndroidJUnit4.class)
+@MediumTest
+public class MainActivityTest {
+
+    @Rule
+    public final ActivityTestRule<MainActivity> mActivityRule =
+            new ActivityTestRule<>(MainActivity.class);
+
+    /**
+     * Verifies that the activity under test can be launched.
+     */
+    @Test
+    public void activityLaunches() {
+        assertNotNull(mActivityRule.getActivity());
+    }
+}
diff --git a/sample_updater/tests/src/com/example/android/systemupdatersample/util/PayloadSpecsTest.java b/sample_updater/tests/src/com/example/android/systemupdatersample/util/PayloadSpecsTest.java
new file mode 100644
index 0000000..6f06ca3
--- /dev/null
+++ b/sample_updater/tests/src/com/example/android/systemupdatersample/util/PayloadSpecsTest.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2018 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.example.android.systemupdatersample.util;
+
+import static com.example.android.systemupdatersample.util.PackagePropertyFiles.PAYLOAD_BINARY_FILE_NAME;
+import static com.example.android.systemupdatersample.util.PackagePropertyFiles.PAYLOAD_PROPERTIES_FILE_NAME;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+
+import com.example.android.systemupdatersample.PayloadSpec;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.zip.CRC32;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+/**
+ * Tests if PayloadSpecs parses update package zip file correctly.
+ */
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class PayloadSpecsTest {
+
+    private static final String PROPERTIES_CONTENTS = "k1=val1\nkey2=val2";
+    private static final String PAYLOAD_CONTENTS    = "hello\nworld";
+    private static final int PAYLOAD_SIZE           = PAYLOAD_CONTENTS.length();
+
+    private File mTestDir;
+
+    private Context mContext;
+
+    @Rule
+    public final ExpectedException thrown = ExpectedException.none();
+
+    @Before
+    public void setUp() {
+        mContext = InstrumentationRegistry.getTargetContext();
+
+        mTestDir = mContext.getFilesDir();
+    }
+
+    @Test
+    public void forNonStreaming_works() throws Exception {
+        File packageFile = createMockZipFile();
+        PayloadSpec spec = PayloadSpecs.forNonStreaming(packageFile);
+
+        assertEquals("correct url", "file://" + packageFile.getAbsolutePath(), spec.getUrl());
+        assertEquals("correct payload offset",
+                30 + PAYLOAD_BINARY_FILE_NAME.length(), spec.getOffset());
+        assertEquals("correct payload size", PAYLOAD_SIZE, spec.getSize());
+        assertArrayEquals("correct properties",
+                new String[]{"k1=val1", "key2=val2"}, spec.getProperties().toArray(new String[0]));
+    }
+
+    @Test
+    public void forNonStreaming_IOException() throws Exception {
+        thrown.expect(IOException.class);
+        PayloadSpecs.forNonStreaming(new File("/fake/news.zip"));
+    }
+
+    /**
+     * Creates package zip file that contains payload.bin and payload_properties.txt
+     */
+    private File createMockZipFile() throws IOException {
+        File testFile = new File(mTestDir, "test.zip");
+        try (ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(testFile))) {
+            // Add payload.bin entry.
+            ZipEntry entry = new ZipEntry(PAYLOAD_BINARY_FILE_NAME);
+            entry.setMethod(ZipEntry.STORED);
+            entry.setCompressedSize(PAYLOAD_SIZE);
+            entry.setSize(PAYLOAD_SIZE);
+            CRC32 crc = new CRC32();
+            crc.update(PAYLOAD_CONTENTS.getBytes(StandardCharsets.UTF_8));
+            entry.setCrc(crc.getValue());
+            zos.putNextEntry(entry);
+            zos.write(PAYLOAD_CONTENTS.getBytes(StandardCharsets.UTF_8));
+            zos.closeEntry();
+
+            // Add payload properties entry.
+            ZipEntry propertiesEntry = new ZipEntry(PAYLOAD_PROPERTIES_FILE_NAME);
+            zos.putNextEntry(propertiesEntry);
+            zos.write(PROPERTIES_CONTENTS.getBytes(StandardCharsets.UTF_8));
+            zos.closeEntry();
+        }
+        return testFile;
+    }
+
+}
diff --git a/sample_updater/tests/src/com/example/android/systemupdatersample/util/UpdateConfigsTest.java b/sample_updater/tests/src/com/example/android/systemupdatersample/util/UpdateConfigsTest.java
new file mode 100644
index 0000000..4aa8c64
--- /dev/null
+++ b/sample_updater/tests/src/com/example/android/systemupdatersample/util/UpdateConfigsTest.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2018 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.example.android.systemupdatersample.util;
+
+import static org.junit.Assert.assertArrayEquals;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+
+import com.example.android.systemupdatersample.UpdateConfig;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Tests for {@link UpdateConfigs}
+ */
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class UpdateConfigsTest {
+
+    private Context mContext;
+
+    @Rule
+    public final ExpectedException thrown = ExpectedException.none();
+
+    @Before
+    public void setUp() {
+        mContext = InstrumentationRegistry.getTargetContext();
+    }
+
+    @Test
+    public void configsToNames_extractsNames() {
+        List<UpdateConfig> configs = Arrays.asList(
+                new UpdateConfig("blah", "http://", UpdateConfig.TYPE_NON_STREAMING),
+                new UpdateConfig("blah 2", "http://", UpdateConfig.TYPE_STREAMING)
+        );
+        String[] names = UpdateConfigs.configsToNames(configs);
+        assertArrayEquals(new String[] {"blah", "blah 2"}, names);
+    }
+}