Run Android unit tests for plugin and example in CI.

.github/workflows/ci.yml

@@ -32,6 +32,18 @@ jobs:
           flutter-version: 3.x
       - run: flutter --version
 
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: 17
+          distribution: 'temurin'
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Set up local.properties
+        run: bash .github/workflows/create_properties.sh
+
       - name: Install dependencies
         run: flutter pub get
 
@@ -48,6 +60,9 @@ jobs:
       - name: Run example app tests
         run: cd example && flutter test
 
+      - name: Run Android unit tests
+        run: cd example/android && gradle test
+
       - name: Test docs generation
         run: dart doc --dry-run
 

.github/workflows/create_properties.sh

@@ -0,0 +1,7 @@
+#! /bin/bash
+
+# Generate a local.properties file sufficient to build and run Android unit tests.
+# Run from project root directory.
+echo "FSOrgId=TEST" > example/android/local.properties
+FLUTTER_BIN=$(dirname "$(which flutter)")
+echo "flutter.sdk=$FLUTTER_BIN/.." >> example/android/local.properties