Adding a unit test for VideoService

backend/kaiser/src/test/java/com/example/springKaiser/business/video/VideoServiceTest.java

@@ -0,0 +1,53 @@
+package com.example.springKaiser.business.video;
+
+import com.example.springKaiser.entities.Video;
+import com.example.springKaiser.repositories.VideoRepository;
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+class VideoServiceTest {
+
+    @Autowired
+    VideoService videoService;
+
+    //Mock data (in this case VideoRepository), so we can call it when we call the service.
+    @MockBean
+    VideoRepository videoRepository;
+
+    @Test
+    void listVideoTest() {
+        //Unit test layout: When, Call Service, Assert/Test
+
+        //When
+        List<Video> videoListExample = new ArrayList<>();
+        Video video = new Video();
+        video.setName("Test1");
+        videoListExample.add(video);
+        Mockito.when(videoRepository.findAll()).thenReturn(videoListExample);
+
+        //Call Service
+        List<Video> testResult = videoService.listVideo();
+
+        //Assert/Test
+        //Expected Result, then Value we're receiving
+        //"Test1" .equals testResult.get(0).getName()
+
+        //Below are a couple ways to use asserts:
+        //This way checks if a condition is true
+        Assert.assertTrue(("Test1").equals(testResult.get(0).getName()));
+        //This way compares to strings/objects
+        Assert.assertEquals("Test1",testResult.get(0).getName());
+
+    }
+}