test(hello): add integration test for CreateHello endpoint

src/test/java/de/szut/lf8_starter/integration/hello/CreateHelloTest.java

@@ -0,0 +1,50 @@
+package de.szut.lf8_starter.integration.hello;
+
+import de.szut.lf8_starter.hello.HelloRepository;
+import org.json.JSONObject;
+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.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+
+import java.time.LocalDate;
+import java.util.Arrays;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc(addFilters = false)
+class CreateHelloTest {
+    @Autowired
+    private MockMvc mockMvc;
+    @Autowired
+    private HelloRepository helloRepository;
+    @Test
+    void createProjectTest() throws Exception {
+        String content = """
+                {
+                    "message": "test"
+                  }
+                """;
+
+        final var contentAsString = this.mockMvc.perform(
+                        post("/hello").content(content).contentType(MediaType.APPLICATION_JSON)
+                )
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("message", is("test")))
+                .andReturn()
+                .getResponse()
+                .getContentAsString();
+
+        final var id = Long.parseLong(new JSONObject(contentAsString).get("id").toString());
+
+        final var hello = this.helloRepository.findById(id);
+        assertThat(hello.get().getMessage()).isEqualTo("test");
+    }
+}