add first integration test based on Testcontainers

src/test/java/net/hostsharing/hsadminng/RbacIntegrationTests.java

@@ -0,0 +1,26 @@
+package net.hostsharing.hsadminng;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.transaction.Transactional;
+
+@DataJpaTest
+class RbacIntegrationTests {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    @Test
+    @Transactional
+    void currentUser() {
+        em.createNativeQuery("SET LOCAL hsadminng.currentUser = 'mike@hostsharing.net';").executeUpdate();
+        em.createNativeQuery("SET LOCAL hsadminng.assumedRoles = '';").executeUpdate();
+
+        final var result = em.createNativeQuery("select currentUser()").getSingleResult();
+        Assertions.assertThat(result).isEqualTo("mike@hostsharing.net");
+    }
+}