moved OSIV examples from spring-data-jpa-3 to spring-data-jpa-4

persistence-modules/spring-data-jpa-4/src/test/java/com/baeldung/osiv/UserControllerIntegrationTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.osiv;
+
+import com.baeldung.Application;
+import com.baeldung.model.BasicUser;
+import com.baeldung.repository.BasicUserRepository;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.web.servlet.MockMvc;
+
+import java.util.Arrays;
+import java.util.HashSet;
+
+import static org.hamcrest.Matchers.containsInAnyOrder;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+@ContextConfiguration(classes = Application.class)
+@ActiveProfiles("test")
+class UserControllerIntegrationTest {
+
+    @Autowired
+    private BasicUserRepository userRepository;
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @BeforeEach
+    void setUp() {
+        BasicUser user = new BasicUser();
+        user.setUsername("root");
+        user.setPermissions(new HashSet<>(Arrays.asList("PERM_READ", "PERM_WRITE")));
+
+        userRepository.save(user);
+    }
+
+    @Test
+    void givenTheUserExists_WhenOsivIsEnabled_ThenLazyInitWorkEverywhere() throws Exception {
+        mockMvc.perform(get("/users/root"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.username").value("root"))
+                .andExpect(jsonPath("$.permissions", containsInAnyOrder("PERM_READ", "PERM_WRITE")));
+    }
+
+    @AfterEach
+    void flushDb() {
+        userRepository.deleteAll();
+    }
+}