feat(android): add a heap growth detection test

android/build.gradle.kts

@@ -6,6 +6,8 @@
  */
 @file:Suppress("UnstableApiUsage")
 
+import dev.msfjarvis.claw.gradle.addTestDependencies
+
 plugins {
   id("dev.msfjarvis.claw.android-application")
   id("dev.msfjarvis.claw.rename-artifacts")
@@ -14,6 +16,7 @@ plugins {
   id("dev.msfjarvis.claw.sentry")
   id("dev.msfjarvis.claw.versioning-plugin")
   alias(libs.plugins.aboutlibraries)
+  alias(libs.plugins.android.junit5)
   alias(libs.plugins.anvil)
   alias(libs.plugins.modulegraphassert)
   alias(libs.plugins.whetstone)
@@ -25,6 +28,7 @@ plugins {
 android {
   namespace = "dev.msfjarvis.claw.android"
   defaultConfig.applicationId = "dev.msfjarvis.claw.android"
+  defaultConfig.testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
   buildFeatures.compose = true
   composeOptions {
     useLiveLiterals = false
@@ -113,4 +117,9 @@ dependencies {
   implementation(projects.web)
 
   kapt(libs.dagger.compiler)
+
+  addTestDependencies(project)
+  androidTestImplementation(libs.androidx.test.espresso.core)
+  androidTestImplementation(libs.androidx.test.uiautomator)
+  androidTestImplementation(libs.leakcanary.android.test)
 }

android/src/androidTest/AndroidManifest.xml

@@ -0,0 +1,13 @@
+<!--
+ ~ Copyright © 2021-2024 Harsh Shandilya.
+ ~ Use of this source code is governed by an MIT-style
+ ~ license that can be found in the LICENSE file or at
+ ~ https://opensource.org/licenses/MIT.
+ -->
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+  <!-- Performing the heap growth analysis in process requires more heap. -->
+  <application
+      android:largeHeap="true"/>
+</manifest>

android/src/androidTest/kotlin/dev/msfjarvis/claw/android/HeapGrowthCheck.kt

@@ -0,0 +1,59 @@
+/*
+ * Copyright © 2024 Harsh Shandilya.
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+package dev.msfjarvis.claw.android
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.uiautomator.By
+import androidx.test.uiautomator.BySelector
+import androidx.test.uiautomator.UiDevice
+import androidx.test.uiautomator.UiObject2
+import androidx.test.uiautomator.Until
+import com.google.common.truth.Truth.assertThat
+import de.mannodermaus.junit5.ActivityScenarioExtension
+import leakcanary.repeatingAndroidInProcessScenario
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.RegisterExtension
+import shark.ObjectGrowthDetector
+import shark.forAndroidHeap
+
+class HeapGrowthCheck {
+  @JvmField
+  @RegisterExtension
+  val scenarioExtension = ActivityScenarioExtension.launch<MainActivity>()
+  private val detector = ObjectGrowthDetector.forAndroidHeap().repeatingAndroidInProcessScenario()
+  private lateinit var device: UiDevice
+
+  @BeforeEach
+  fun setUp() {
+    val instrumentation = InstrumentationRegistry.getInstrumentation()
+    device = UiDevice.getInstance(instrumentation)
+  }
+
+  @Test
+  fun verify_heap_growth() {
+    val heapGrowth = detector.findRepeatedlyGrowingObjects { device.exploreScreens() }
+    assertThat(heapGrowth.growingObjects).isEmpty()
+  }
+
+  private companion object {
+    fun UiDevice.exploreScreens() {
+      listOf("HOTTEST", "NEWEST", "SAVED").forEach { tag ->
+        waitForObject(By.res(tag)).click()
+        waitForIdle()
+      }
+    }
+
+    private fun UiDevice.waitForObject(selector: BySelector, timeout: Long = 10_000L): UiObject2 {
+      if (wait(Until.hasObject(selector), timeout)) {
+        return findObject(selector)
+      }
+
+      error("Object with selector [$selector] not found")
+    }
+  }
+}