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Added test classes for article

spring-boot/src/test/java/org/baeldung/MockAnnotationTest.java

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+package org.baeldung;
+
+import org.baeldung.repository.UserRepository;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class MockAnnotationTest {
+    
+    @Mock
+    UserRepository mockRepository;
+
+    @Test
+    public void testMockAnnotation() {
+        Mockito.when(mockRepository.count()).thenReturn(123L);
+        long userCount = mockRepository.count();
+        Assert.assertEquals(123L, userCount);
+        Mockito.verify(mockRepository).count();
+    }
+    
+    @Test
+    public void testMockitoMockMethod() {
+        UserRepository localMockRepository = Mockito.mock(UserRepository.class);
+        Mockito.when(localMockRepository.count()).thenReturn(111L);
+        long userCount = localMockRepository.count();
+        Assert.assertEquals(111L, userCount);
+        Mockito.verify(localMockRepository).count();  
+    }
+}