diff --git a/backend/demo-group7/src/test/java/com/group7/demo/PostControllerTest.java b/backend/demo-group7/src/test/java/com/group7/demo/PostControllerTest.java
new file mode 100644
index 0000000..8765f09
--- /dev/null
+++ b/backend/demo-group7/src/test/java/com/group7/demo/PostControllerTest.java
@@ -0,0 +1,205 @@
+package com.group7.demo;
+
+import com.group7.demo.controllers.PostController;
+import com.group7.demo.dtos.PostRequest;
+import com.group7.demo.dtos.PostResponse;
+import com.group7.demo.services.PostService;
+import jakarta.servlet.http.HttpServletRequest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+
+import java.time.LocalDateTime;
+import java.util.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.*;
+
+class PostControllerTest {
+
+    @Mock
+    private PostService postService;
+
+    @Mock
+    private HttpServletRequest request;
+
+    @InjectMocks
+    private PostController postController;
+
+    @BeforeEach
+    void setUp() {
+        MockitoAnnotations.openMocks(this);
+    }
+
+    @Test
+    void createPost_Success() {
+        // Arrange
+        PostRequest postRequest = new PostRequest();
+        postRequest.setContent("Test content");
+        postRequest.setTags(Set.of("fitness", "health"));
+
+        PostResponse expectedResponse = PostResponse.builder()
+                .id(1L)
+                .content("Test content")
+                .tags(Set.of("fitness", "health"))
+                .createdAt(LocalDateTime.now())
+                .build();
+
+        when(postService.createPost(any(PostRequest.class), any(HttpServletRequest.class)))
+                .thenReturn(expectedResponse);
+
+        // Act
+        ResponseEntity<PostResponse> response = postController.createPost(postRequest, request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        assertNotNull(response.getBody());
+        assertEquals(expectedResponse, response.getBody());
+        verify(postService).createPost(eq(postRequest), eq(request));
+    }
+
+    @Test
+    void fetchPosts_WithTags() {
+        // Arrange
+        Set<String> tags = Set.of("fitness", "health");
+        List<PostResponse> expectedPosts = Arrays.asList(
+                PostResponse.builder().id(1L).build(),
+                PostResponse.builder().id(2L).build()
+        );
+
+        when(postService.getPostsByTags(tags, request)).thenReturn(expectedPosts);
+
+        // Act
+        ResponseEntity<List<PostResponse>> response = postController.fetchPosts(tags, request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        assertNotNull(response.getBody());
+        assertEquals(expectedPosts, response.getBody());
+        verify(postService).getPostsByTags(tags, request);
+    }
+
+    @Test
+    void fetchPosts_WithoutTags() {
+        // Arrange
+        List<PostResponse> expectedPosts = Arrays.asList(
+                PostResponse.builder().id(1L).build(),
+                PostResponse.builder().id(2L).build()
+        );
+
+        when(postService.getAllPosts(request)).thenReturn(expectedPosts);
+
+        // Act
+        ResponseEntity<List<PostResponse>> response = postController.fetchPosts(null, request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        assertNotNull(response.getBody());
+        assertEquals(expectedPosts, response.getBody());
+        verify(postService).getAllPosts(request);
+    }
+
+    @Test
+    void deletePost_Success() throws IllegalAccessException {
+        // Arrange
+        Long postId = 1L;
+        doNothing().when(postService).deletePost(postId, request);
+
+        // Act
+        ResponseEntity<String> response = postController.deletePost(postId, request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        assertEquals("Post deleted successfully.", response.getBody());
+        verify(postService).deletePost(postId, request);
+    }
+
+    @Test
+    void deletePost_Unauthorized() throws IllegalAccessException {
+        // Arrange
+        Long postId = 1L;
+        doThrow(new IllegalAccessException("Unauthorized")).when(postService).deletePost(postId, request);
+
+        // Act
+        ResponseEntity<String> response = postController.deletePost(postId, request);
+
+        // Assert
+        assertEquals(HttpStatus.FORBIDDEN, response.getStatusCode());
+        verify(postService).deletePost(postId, request);
+    }
+
+    @Test
+    void getRandomPosts_Success() {
+        // Arrange
+        int count = 5;
+        List<PostResponse> expectedPosts = Arrays.asList(
+                PostResponse.builder().id(1L).build(),
+                PostResponse.builder().id(2L).build()
+        );
+
+        when(postService.getRandomPosts(count, request)).thenReturn(expectedPosts);
+
+        // Act
+        ResponseEntity<List<PostResponse>> response = postController.getRandomPosts(count, request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        assertNotNull(response.getBody());
+        assertEquals(expectedPosts, response.getBody());
+        verify(postService).getRandomPosts(count, request);
+    }
+
+    @Test
+    void likePost_Success() {
+        // Arrange
+        Long postId = 1L;
+        doNothing().when(postService).likePost(postId, request);
+
+        // Act
+        ResponseEntity<Void> response = postController.likePost(postId, request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        verify(postService).likePost(postId, request);
+    }
+
+    @Test
+    void unlikePost_Success() {
+        // Arrange
+        Long postId = 1L;
+        doNothing().when(postService).unlikePost(postId, request);
+
+        // Act
+        ResponseEntity<Void> response = postController.unlikePost(postId, request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        verify(postService).unlikePost(postId, request);
+    }
+
+    @Test
+    void getBookmarkedPosts_Success() {
+        // Arrange
+        List<PostResponse> expectedPosts = Arrays.asList(
+                PostResponse.builder().id(1L).build(),
+                PostResponse.builder().id(2L).build()
+        );
+
+        when(postService.getBookmarkedPosts(request)).thenReturn(expectedPosts);
+
+        // Act
+        ResponseEntity<List<PostResponse>> response = postController.getBookmarkedPosts(request);
+
+        // Assert
+        assertEquals(HttpStatus.OK, response.getStatusCode());
+        assertNotNull(response.getBody());
+        assertEquals(expectedPosts, response.getBody());
+        verify(postService).getBookmarkedPosts(request);
+    }
+}