test: add WelcomeTest for welcome endpoint validation

src/test/java/de/szut/lf8_starter/integration/welcome/WelcomeTest.java

@@ -0,0 +1,24 @@
+package de.szut.lf8_starter.integration.welcome;
+
+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.web.servlet.MockMvc;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+class WelcomeTest {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void welcomeTest() throws Exception {
+        mockMvc.perform(get("/welcome"))
+                .andExpect(status().isOk())
+                .andExpect(content().string("welcome to lf8_starter"));
+    }
+}