test: migrate to androidx

Author: jo-elimu

app/build.gradle

@@ -10,6 +10,7 @@ android {
         targetSdkVersion 35
         versionCode 1000007
         versionName "1.0.7-SNAPSHOT"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
@@ -29,8 +30,13 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    testImplementation 'junit:junit:4.13.2'
+
     implementation 'com.android.support:appcompat-v7:28.0.0'
+
+    testImplementation 'junit:junit:4.13.2'
+
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
 }
 
 publishing {

app/src/androidTest/java/ai/elimu/keyboard/ApplicationTest.java

@@ -0,0 +1,27 @@
+package ai.elimu.keyboard;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+
+        assertEquals("ai.elimu.keyboard.debug", appContext.getPackageName());
+    }
+}

app/src/androidTest/java/ai/elimu/keyboard/ExampleInstrumentedTest.java

@@ -15,4 +15,9 @@
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
+# org.gradle.parallel=true
+
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true