Add unit tests for ReviewHelper in-app review logic

Author: MihaiCristianCondrea

app/src/test/java/com/d4rk/androidtutorials/java/utils/ReviewHelperTest.java

@@ -0,0 +1,91 @@
+package com.d4rk.androidtutorials.java.utils;
+
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.mockStatic;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+
+import com.google.android.gms.tasks.OnCompleteListener;
+import com.google.android.gms.tasks.Task;
+import com.google.android.play.core.review.ReviewInfo;
+import com.google.android.play.core.review.ReviewManager;
+import com.google.android.play.core.review.ReviewManagerFactory;
+
+import org.junit.Test;
+import org.mockito.ArgumentMatchers;
+import org.mockito.MockedStatic;
+
+public class ReviewHelperTest {
+
+    @Test
+    public void launchInAppReviewIfEligible_launchesReviewWhenEligible() {
+        Activity activity = mock(Activity.class);
+        ReviewManager reviewManager = mock(ReviewManager.class);
+        Task<ReviewInfo> reviewInfoTask = mock(Task.class);
+        Task<Void> flowTask = mock(Task.class);
+        ReviewInfo reviewInfo = mock(ReviewInfo.class);
+        Runnable callback = mock(Runnable.class);
+
+        when(reviewManager.requestReviewFlow()).thenReturn(reviewInfoTask);
+        when(reviewInfoTask.isSuccessful()).thenReturn(true);
+        when(reviewInfoTask.getResult()).thenReturn(reviewInfo);
+        when(reviewManager.launchReviewFlow(activity, reviewInfo)).thenReturn(flowTask);
+
+        doAnswer(invocation -> {
+            OnCompleteListener<ReviewInfo> listener = invocation.getArgument(0);
+            listener.onComplete(reviewInfoTask);
+            return reviewInfoTask;
+        }).when(reviewInfoTask).addOnCompleteListener(ArgumentMatchers.<OnCompleteListener<ReviewInfo>>any());
+
+        doAnswer(invocation -> {
+            OnCompleteListener<Void> listener = invocation.getArgument(0);
+            listener.onComplete(flowTask);
+            return flowTask;
+        }).when(flowTask).addOnCompleteListener(ArgumentMatchers.<OnCompleteListener<Void>>any());
+
+        try (MockedStatic<ReviewManagerFactory> factory = mockStatic(ReviewManagerFactory.class)) {
+            factory.when(() -> ReviewManagerFactory.create(activity)).thenReturn(reviewManager);
+
+            ReviewHelper.launchInAppReviewIfEligible(activity, 3, false, callback);
+
+            factory.verify(times(1), () -> ReviewManagerFactory.create(activity));
+        }
+
+        verify(reviewManager).requestReviewFlow();
+        verify(reviewManager).launchReviewFlow(activity, reviewInfo);
+        verify(callback, times(1)).run();
+    }
+
+    @Test
+    public void launchInAppReviewIfEligible_doesNotLaunchWhenBelowThreshold() {
+        Activity activity = mock(Activity.class);
+        Runnable callback = mock(Runnable.class);
+
+        try (MockedStatic<ReviewManagerFactory> factory = mockStatic(ReviewManagerFactory.class)) {
+            ReviewHelper.launchInAppReviewIfEligible(activity, 2, false, callback);
+
+            factory.verifyNoInteractions();
+        }
+
+        verifyNoInteractions(callback);
+    }
+
+    @Test
+    public void launchInAppReviewIfEligible_doesNotLaunchWhenAlreadyPrompted() {
+        Activity activity = mock(Activity.class);
+        Runnable callback = mock(Runnable.class);
+
+        try (MockedStatic<ReviewManagerFactory> factory = mockStatic(ReviewManagerFactory.class)) {
+            ReviewHelper.launchInAppReviewIfEligible(activity, 5, true, callback);
+
+            factory.verifyNoInteractions();
+        }
+
+        verifyNoInteractions(callback);
+    }
+}