diff --git a/src/test/java/br/com/springnoobs/reminderapi/reminder/controller/ReminderControllerTest.java b/src/test/java/br/com/springnoobs/reminderapi/reminder/controller/ReminderControllerTest.java
new file mode 100644
index 0000000..36108df
--- /dev/null
+++ b/src/test/java/br/com/springnoobs/reminderapi/reminder/controller/ReminderControllerTest.java
@@ -0,0 +1,179 @@
+package br.com.springnoobs.reminderapi.reminder.controller;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import br.com.springnoobs.reminderapi.reminder.dto.request.CreateReminderRequestDTO;
+import br.com.springnoobs.reminderapi.reminder.dto.request.UpdateReminderRequestDTO;
+import br.com.springnoobs.reminderapi.reminder.dto.response.ReminderResponseDTO;
+import br.com.springnoobs.reminderapi.reminder.exception.NotFoundException;
+import br.com.springnoobs.reminderapi.reminder.exception.PastRemindAtException;
+import br.com.springnoobs.reminderapi.reminder.service.ReminderService;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.time.Instant;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.bean.override.mockito.MockitoBean;
+import org.springframework.test.web.servlet.MockMvc;
+
+@WebMvcTest(ReminderController.class)
+@ActiveProfiles("test")
+class ReminderControllerTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Autowired
+    private ObjectMapper objectMapper;
+
+    @MockitoBean
+    private ReminderService service;
+
+    @Test
+    void shouldReturnReminderListWhenListAllReminders() throws Exception {
+        ReminderResponseDTO response1 = new ReminderResponseDTO("Lembrete A", Instant.now());
+        ReminderResponseDTO response2 = new ReminderResponseDTO("Lembrete B", Instant.now());
+
+        Page<ReminderResponseDTO> pageResult = new PageImpl<>(List.of(response1, response2));
+
+        when(service.findAll(any())).thenReturn(pageResult);
+
+        mockMvc.perform(get("/reminders?page=0&size=10").accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.content[0].title").value("Lembrete A"))
+                .andExpect(jsonPath("$.content[1].title").value("Lembrete B"))
+                .andExpect(jsonPath("$.page.totalElements").value(2));
+    }
+
+    @Test
+    public void shouldReturnEmptyReminderListWhenListAllReminders() throws Exception {
+        when(service.findAll(any())).thenReturn(Page.empty());
+
+        mockMvc.perform(get("/reminders?page=0&size=10").accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.content").isEmpty());
+    }
+
+    @Test
+    void shouldReturnReminderWhenFindByIdWithValidId() throws Exception {
+        long reminderId = 1L;
+        var response = new ReminderResponseDTO("Test Reminder", Instant.now());
+        when(service.findById(reminderId)).thenReturn(response);
+
+        mockMvc.perform(get("/reminders/{id}", reminderId).accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.title").value("Test Reminder"));
+    }
+
+    @Test
+    void shouldReturnNotFoundWhenFindByIdWithInvalidId() throws Exception {
+        long reminderId = 99L;
+        when(service.findById(reminderId)).thenThrow(new NotFoundException("Reminder not found"));
+
+        mockMvc.perform(get("/reminders/{id}", reminderId).accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isNotFound());
+    }
+
+    @Test
+    void shouldCreateReminderWhenRequestIsValid() throws Exception {
+        var request = new CreateReminderRequestDTO("New Reminder", Instant.now().plusSeconds(60));
+        var response = new ReminderResponseDTO("New Reminder", request.remindAt());
+
+        when(service.create(any(CreateReminderRequestDTO.class))).thenReturn(response);
+
+        mockMvc.perform(post("/reminders")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(request)))
+                .andExpect(status().isCreated())
+                .andExpect(jsonPath("$.title").value("New Reminder"));
+    }
+
+    @Test
+    void shouldReturnBadRequestWhenCreatingReminderWithPastDate() throws Exception {
+        var request =
+                new CreateReminderRequestDTO("Past Reminder", Instant.now().minusSeconds(60));
+
+        when(service.create(any(CreateReminderRequestDTO.class)))
+                .thenThrow(new PastRemindAtException("Remind at date must be in the future"));
+
+        mockMvc.perform(post("/reminders")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(request)))
+                .andExpect(status().isBadRequest());
+    }
+
+    @Test
+    void shouldUpdateReminderWhenRequestIsValid() throws Exception {
+        long reminderId = 1L;
+        var request =
+                new UpdateReminderRequestDTO("Updated Reminder", Instant.now().plusSeconds(60));
+        var response = new ReminderResponseDTO("Updated Reminder", request.remindAt());
+
+        when(service.update(any(Long.class), any(UpdateReminderRequestDTO.class)))
+                .thenReturn(response);
+
+        mockMvc.perform(put("/reminders/{id}", reminderId)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(request)))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.title").value("Updated Reminder"));
+    }
+
+    @Test
+    void shouldReturnBadRequestWhenUpdatingReminderWithPastDate() throws Exception {
+        long reminderId = 1L;
+        var request =
+                new UpdateReminderRequestDTO("Past Reminder", Instant.now().minusSeconds(60));
+
+        when(service.update(any(Long.class), any(UpdateReminderRequestDTO.class)))
+                .thenThrow(new PastRemindAtException("Remind at date must be in the future"));
+
+        mockMvc.perform(put("/reminders/{id}", reminderId)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(request)))
+                .andExpect(status().isBadRequest());
+    }
+
+    @Test
+    void shouldReturnNotFoundWhenUpdatingNonExistentReminder() throws Exception {
+        long reminderId = 99L;
+        var request =
+                new UpdateReminderRequestDTO("Updated Reminder", Instant.now().plusSeconds(60));
+
+        when(service.update(any(Long.class), any(UpdateReminderRequestDTO.class)))
+                .thenThrow(new NotFoundException("Reminder not found"));
+
+        mockMvc.perform(put("/reminders/{id}", reminderId)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(request)))
+                .andExpect(status().isNotFound());
+    }
+
+    @Test
+    void shouldDeleteReminderWhenIdIsValid() throws Exception {
+        long reminderId = 1L;
+
+        mockMvc.perform(delete("/reminders/{id}", reminderId)).andExpect(status().isNoContent());
+    }
+
+    @Test
+    void shouldReturnNotFoundWhenDeletingNonExistentReminder() throws Exception {
+        long reminderId = 99L;
+        doThrow(new NotFoundException("Reminder not found")).when(service).delete(reminderId);
+
+        mockMvc.perform(delete("/reminders/{id}", reminderId)).andExpect(status().isNotFound());
+    }
+}