Add unit test for VetController to cover pagination scenario

src/test/java/org/springframework/samples/petclinic/vet/VetControllerTest.java

@@ -0,0 +1,55 @@
+package org.springframework.samples.petclinic.vet;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.ui.Model;
+import java.util.Collections;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.verify;
+
+@ExtendWith(MockitoExtension.class)
+class VetControllerTest {
+
+	@Mock
+	private VetRepository vetRepository;
+
+	@Mock
+	private Model model;
+
+	@InjectMocks
+	private VetController vetController;
+
+	@BeforeEach
+	void setUp() {
+	}
+
+	@Test
+	@DisplayName("Test showVetList with pagination")
+	void testShowVetListWithPagination() {
+		int page = 1;
+		Pageable pageable = PageRequest.of(page - 1, 5);
+		Page<Vet> paginatedVets = new PageImpl<>(Collections.emptyList(), pageable, 0);
+
+		doReturn(paginatedVets).when(vetRepository).findAll(pageable);
+
+		String viewName = vetController.showVetList(page, model);
+
+		assertThat(viewName).isEqualTo("vets/vetList");
+		verify(vetRepository).findAll(pageable);
+		verify(model).addAttribute("currentPage", page);
+		verify(model).addAttribute("totalPages", paginatedVets.getTotalPages());
+		verify(model).addAttribute("totalItems", paginatedVets.getTotalElements());
+		verify(model).addAttribute("listVets", paginatedVets.getContent());
+	}
+
+}