Merge remote-tracking branch 'origin/master'

test/java/CredentialsTest.java

@@ -16,4 +16,10 @@ class CredentialsTest {
         assertTrue(cred.valid());
     }
 
+    @Test
+    void validWrongData() {
+        Credentials cred = new Credentials("hofmannol", "GEHEIM123");
+        assertFalse(cred.valid());
+    }
+
 }