setup testing environment with test-db, added test

backend/src/test/java/com/vaessl/app/ApplicationTests.java

@@ -1,13 +1,29 @@
 package com.vaessl.app;
 
+import java.sql.Connection;
+import java.sql.SQLException;
+
+import javax.sql.DataSource;
+
 import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+
+import static org.assertj.core.api.Assertions.assertThat;
 
 @SpringBootTest
+@ActiveProfiles("test")
 class ApplicationTests {
 
-	@Test
-	void contextLoads() {
-	}
+	@Autowired
+    private DataSource dataSource;
 
+    @Test
+    void connectionToTestDbWorks() throws SQLException {
+        try (Connection connection = dataSource.getConnection()) {
+            assertThat(connection.getMetaData().getURL()).contains("vaessl_test");
+        }
+    
+    }
 }