add first intrumentation test to demo

demo/build.gradle.kts

@@ -25,6 +25,8 @@ android {
         versionCode = 1
         versionName = "1.0"
         vectorDrawables.useSupportLibrary = true
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildFeatures {
@@ -55,6 +57,7 @@ android {
     sourceSets {
         named("main")  { java { srcDirs("src/main/kotlin") } }
         named("test")  { java { srcDirs("src/test/kotlin") } }
+        named("androidTest")  { java { srcDirs("src/androidTest/kotlin") } }
         named("debug") { java { srcDirs("src/debug/kotlin") } }
     }
 
@@ -76,6 +79,15 @@ dependencies {
     implementation("dev.hotwire:strada:1.0.0-beta3")
 
     implementation(project(":turbo"))
+
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.ext:junit-ktx:1.1.5")
+    androidTestImplementation("androidx.test:core-ktx:1.5.0")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+    androidTestImplementation("com.adevinta.android:barista:4.2.0") {
+        exclude(group = "org.jetbrains.kotlin") // Only if you already use Kotlin in your project
+    }
+    androidTestImplementation("androidx.test.espresso:espresso-web:3.5.1")
 }
 
 repositories {

demo/src/androidTest/kotlin/dev/hotwire/turbo/demo/TurboNativeFeatureTest.kt

@@ -0,0 +1,72 @@
+package dev.hotwire.turbo.demo
+
+import android.view.View
+import android.view.ViewGroup
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.espresso.web.sugar.Web.onWebView
+import androidx.test.espresso.web.webdriver.DriverAtoms.findElement
+import androidx.test.espresso.web.webdriver.DriverAtoms.getText
+import androidx.test.espresso.web.webdriver.Locator
+import androidx.test.ext.junit.rules.activityScenarioRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import com.adevinta.android.barista.assertion.BaristaVisibilityAssertions.assertDisplayed
+import com.adevinta.android.barista.internal.matcher.DrawableMatcher.Companion.withDrawable
+import dev.hotwire.turbo.demo.main.MainActivity
+import junit.framework.TestCase.assertEquals
+import org.hamcrest.CoreMatchers.containsString
+import org.hamcrest.Description
+import org.hamcrest.Matcher
+import org.hamcrest.TypeSafeMatcher
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class TurboNativeFeatureTest {
+    @get:Rule
+    val activityScenarioRule =
+        activityScenarioRule<MainActivity>()
+
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("dev.hotwire.turbo.demo",
+            appContext.packageName)
+    }
+
+    @Test
+    fun displayScreenTitle() {
+        onView(withId(R.id.app_bar_logo))
+            .check(matches(withDrawable(R.drawable.ic_turbo_logo)))
+    }
+
+    @Test
+    fun displayMainTurboView() {
+        onView(withId(R.id.app_bar_logo))
+        Thread.sleep(1000)
+        onWebView().forceJavascriptEnabled()
+            .withElement(findElement(Locator.LINK_TEXT, "Navigate to another webpage"))
+    }
+
+    fun nthChildOf(parentMatcher: Matcher<View>, childPosition: Int): Matcher<View> {
+        return object : TypeSafeMatcher<View>() {
+            override fun describeTo(description: Description) {
+                description.appendText("position $childPosition of parent ")
+                parentMatcher.describeTo(description)
+            }
+
+            public override fun matchesSafely(view: View): Boolean {
+                if (view.parent !is ViewGroup) return false
+                val parent = view.parent as ViewGroup
+
+                return (parentMatcher.matches(parent)
+                        && parent.childCount > childPosition
+                        && parent.getChildAt(childPosition) == view)
+            }
+        }
+    }
+}