Add a background testapp.

It only instantiates WorkManager and enqueues 2 workers for now.

Test: This is it.

Change-Id: If8ccf7973d5f398dd10790f63140250b252e0f71
diff --git a/background/integration-tests/testapp/build.gradle b/background/integration-tests/testapp/build.gradle
new file mode 100644
index 0000000..c998e5e
--- /dev/null
+++ b/background/integration-tests/testapp/build.gradle
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+apply plugin: 'com.android.application'
+
+project.ext.noDocs = true
+
+android {
+    compileSdkVersion tools.current_sdk
+    buildToolsVersion tools.build_tools_version
+
+    defaultConfig {
+        minSdkVersion flatfoot.min_sdk
+        targetSdkVersion tools.current_sdk
+        versionCode 1
+        versionName "1.0"
+    }
+    testOptions {
+        unitTests.returnDefaultValues = true
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
+}
+
+dependencies {
+    compile project(':arch:runtime')
+    compile project(':arch:common')
+    compile project(':background:workmanager')
+    compile project(':lifecycle:extensions')
+    compile project(':lifecycle:runtime')
+    compile project(':lifecycle:common')
+    compile project(':room:runtime')
+    compile 'com.android.support:multidex:1.0.1'
+
+    compile libs.support.recyclerview, libs.support_exclude_config
+    compile libs.support.app_compat, libs.support_exclude_config
+}
+
+createAndroidCheckstyle(project)
+tasks['check'].dependsOn(tasks['connectedCheck'])
+
+uploadArchives.enabled = false