Add Emerge Tools Performance Analysis to Hackernews

android/app/build.gradle.kts

@@ -100,6 +100,12 @@ emerge {
     publishableApiKey.set(System.getenv("REAPER_API_KEY"))
   }
 
+  performance {
+    projectPath.set(":performance")
+    tag.set("oneoff")
+    enabled.set(true)
+  }
+
   vcs {
     gitHub {
       repoName.set("hackernews")

android/performance/.gitignore

@@ -0,0 +1 @@
+/build

android/performance/build.gradle.kts

@@ -0,0 +1,21 @@
+// This is a com.android.test project which is automatically configured by the Emerge Tools Gradle plugin:
+//
+// - The SDK version targets are automatically set to be identical to the app project.
+// - The same build types as your app project are automatically created.
+// - Test libraries including UI Automator and Junit and are automatically added as dependencies.
+//
+// The configuration can be modified in this file as needed.
+
+plugins {
+    id("org.jetbrains.kotlin.android")
+}
+
+dependencies {
+    // Emerge's Performance Testing SDK (Required):
+    implementation("com.emergetools.test:performance:2.1.1")
+    // Emerge's UIAutomator helper library (Optional): https://github.com/EmergeTools/relax
+    implementation("com.emergetools.test:relax:0.1.0")
+
+    // Add additional dependencies here as needed.
+    // Note Espresso is not supported as it degrades performance.
+}

android/performance/src/main/AndroidManifest.xml

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest>
+</manifest>

android/performance/src/main/java/com/emergetools/hackernews/ExamplePerformanceTest.kt

@@ -0,0 +1,70 @@
+package com.emergetools.hackernews
+
+import android.content.Context
+import android.content.Intent
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.uiautomator.By
+import androidx.test.uiautomator.UiDevice
+import androidx.test.uiautomator.Until
+import com.emergetools.test.annotations.EmergeInit
+import com.emergetools.test.annotations.EmergeSetup
+import com.emergetools.test.annotations.EmergeTest
+
+private const val LAUNCH_TIMEOUT = 5000L
+private const val APP_PACKAGE_NAME = "com.emergetools.hackernews"
+
+/**
+ * An example performance test class.
+ *
+ * Performance test classes can have multiple tests, but tests in a given class share @EmergeInit and @EmergeSetup
+ * methods. For tests that require a different init or setup multiple test classes are supported.
+ *
+ * Note that each test (ie. each method annotated with @EmergeTest) will be run on a separate device, they cannot
+ * impact each other in any way.
+ */
+class ExamplePerformanceTest {
+
+    @EmergeInit
+    fun init() {
+        // OPTIONAL
+        // Runs just once after installing the app on the test device before any other method.
+        // Typically this is used to log into the app, if needed.
+        // Only one @EmergeInit method per class is supported.
+    }
+
+    @EmergeSetup
+    fun setup() {
+        // OPTIONAL
+        // Runs once before each test iteration.
+        // Typically this is used to navigate through to the screen where the performance test is meant to begin.
+        // Only one @EmergeSetup method per class is supported.
+    }
+
+    @EmergeTest
+    fun myPerformanceTest() {
+        // REQUIRED
+        // The performance test. This is where the app should go through a short flow whose performance is critical.
+        // This might involve launching a screen or any other operation supported by UI Automator.
+        // As an example here we launch the application from the home screen.
+
+        val device = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation())
+        device.pressHome()
+
+        // Wait for launcher
+        device.wait(Until.hasObject(By.pkg(device.launcherPackageName).depth(0)), LAUNCH_TIMEOUT)
+
+        // Launch the app
+        val context = ApplicationProvider.getApplicationContext<Context>()
+        val intent = checkNotNull(context.packageManager.getLaunchIntentForPackage(APP_PACKAGE_NAME)) {
+            "Could not get launch intent for package $APP_PACKAGE_NAME"
+        }
+        // Clear out any previous instances
+        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK)
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        context.startActivity(intent)
+
+        // Wait for the app to appear
+        device.wait(Until.hasObject(By.pkg(APP_PACKAGE_NAME).depth(0)), LAUNCH_TIMEOUT)
+    }
+}

android/settings.gradle.kts

@@ -21,3 +21,4 @@ dependencyResolutionManagement {
 
 rootProject.name = "Hacker News"
 include(":app")
+include(":performance")