Ladybird: Add Espresso test on Android to verify we can load our views

The simple smoke test makes sure that we can boot up an android emulator
with our package in it, and that the WebView is visible on boot.

More tests to come with more features :^)

Ladybird/Android/build.gradle.kts

@@ -75,5 +75,6 @@ dependencies {
     implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.ext:junit-ktx:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
 }

Ladybird/Android/src/androidTest/java/org/serenityos/ladybird/SmokeTest.kt

@@ -0,0 +1,40 @@
+package org.serenityos.ladybird
+
+import androidx.test.ext.junit.rules.activityScenarioRule
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+import org.junit.Rule
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class SmokeTest {
+
+    @get:Rule
+    var activityScenarioRule = activityScenarioRule<LadybirdActivity>()
+
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("org.serenityos.ladybird", appContext.packageName)
+    }
+
+    @Test
+    fun loadWebView() {
+        // We can actually load a web view, and it is visible
+        onView(withId(R.id.web_view)).check(matches(isDisplayed()))
+    }
+}