Testing

WebView/app/build.gradle

@@ -65,4 +65,11 @@ dependencies {
     testImplementation 'junit:junit:4.13'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-web:3.1.0'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-contrib:3.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-intents:3.0.2'
+    androidTestImplementation 'androidx.test:rules:1.1.1'
+    androidTestImplementation 'androidx.test:runner:1.1.0'
+
+
 }

WebView/app/src/androidTest/java/com/android/samples/webviewdemo/ExampleInstrumentedTest.kt

@@ -15,26 +15,62 @@
  */
 
 package com.android.samples.webviewdemo
-
-import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.espresso.web.assertion.WebViewAssertions.webMatches
+import androidx.test.espresso.web.model.Atoms.castOrDie
+import androidx.test.espresso.web.model.Atoms.script
+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.DriverAtoms.webClick
+import androidx.test.espresso.web.webdriver.Locator
 import androidx.test.ext.junit.runners.AndroidJUnit4
-
+import androidx.test.rule.ActivityTestRule
+import org.hamcrest.CoreMatchers.`is`
+import org.hamcrest.CoreMatchers.containsString
+import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
 
-import org.junit.Assert.*
-
 /**
  * Instrumented test, which will execute on an Android device.
  *
  * See [testing documentation](http://d.android.com/tools/testing).
  */
 @RunWith(AndroidJUnit4::class)
 class ExampleInstrumentedTest {
+
+    @Rule @JvmField
+    val mainActivityRule = ActivityTestRule(MainActivity::class.java)
+    fun afterActivityLaunched() {
+      // Technically we do not need to do this - MainActivity has javascript turned on.
+      // Other WebViews in your app may have javascript turned off, however since the only way
+      // to automate WebViews is through javascript, it must be enabled.
+        onWebView().forceJavascriptEnabled()
+    }
+
+    // Test to check that the drop down menu behaves as expected
+    @Test
+    fun dropDownMenu_SanFran() {
+        mainActivityRule.getActivity()
+        onWebView()
+            .withElement(findElement(Locator.ID, "location"))
+            .perform(webClick()) // Similar to perform(click())
+            .withElement(findElement(Locator.ID, "SF"))
+            .perform(webClick()) // Similar to perform(click())
+            .withElement(findElement(Locator.ID, "title"))
+            .check(webMatches(getText(), containsString("San Francisco")))
+    }
+
+    // Test for checking createJsObject
     @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.android.samples.webviewdemo", appContext.packageName)
+    fun jsObjectIsInjectedAndContainsPostMessage() {
+    mainActivityRule.getActivity()
+    onWebView()
+        .check(
+            webMatches(
+                script("return jsObject && jsObject.postMessage != null;", castOrDie(Boolean::class.javaObjectType)),
+                `is`(true)
+            )
+        )
     }
-}
+}

WebView/app/src/main/assets/index.html

@@ -23,7 +23,7 @@
     <label for="location">Choose a location:</label>
     <select name="location" id="location" onchange="getData()">
       <option value="newYork">New York</option>
-      <option value="sanFrancisco">San Francisco</option>
+      <option id= "SF" value="sanFrancisco">San Francisco</option>
       <option value="london">London</option>
     </select>
     <h1 id="title">Location</h1>