Add a basic startup test of the app

src/test/java/de/financer/FinancerApplicationBootTest.java

@@ -0,0 +1,31 @@
+package de.financer;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+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.TestPropertySource;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = FinancerApplication.class)
+@AutoConfigureMockMvc
+@TestPropertySource(
+        locations = "classpath:application-integrationtest.properties")
+public class FinancerApplicationBootTest {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    public void test_appBoots() {
+        // Nothing to do in this test as we just want to startup the app
+        // to make sure that spring, flyway and hibernate all work
+        // as expected even after changes
+        // While this slightly increases build time it's an easy and safe
+        // way to ensure that the app can start
+        Assert.assertTrue(true);
+    }
+}