diff --git a/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java b/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java
index 478f3b0..81c82e1 100644
--- a/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java
+++ b/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java
@@ -59,6 +59,17 @@ public class AuthCodeGrantTest {
         assertThat(accessTokenResponse.accessToken(), is(notNullValue()));
     }
 
+    @Test
+    public void badCredentials() throws IOException {
+        AuthorizationCodeFlow flow = new AuthorizationCodeFlow(authUrl, CLIENT)
+                .scope("scope1 scope2");
+        LoginScreen loginScreen = flow.start().expectLogin();
+
+        loginScreen.submit("x", "bbb").expectError("Invalid credentials")
+                .submit("bob", "bbb").expectError("Invalid credentials")
+                .submit("bob", "password").expectSuccess();
+    }
+
     @Test
     public void authCodeGrant_invalidResponseType() throws IOException {
         AuthorizationCodeFlow flow = new AuthorizationCodeFlow(authUrl, CLIENT)
diff --git a/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java b/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java
index aa75775..f157efe 100644
--- a/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java
+++ b/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java
@@ -12,9 +12,11 @@ import static org.hamcrest.MatcherAssert.assertThat;
 public class LoginScreen {
 
     private final FormElement form;
+    private final Document document;
 
-    public LoginScreen(Document doc) {
-        this.form = doc.expectForm("form");
+    public LoginScreen(Document document) {
+        this.form = document.expectForm("form");
+        this.document = document;
     }
 
     public Result submit(String username, String password) throws IOException {
@@ -36,7 +38,7 @@ public class LoginScreen {
     }
 
     private LoginScreen expectError(String error) {
-        assertThat(Objects.requireNonNull(form.getElementById("error-popup")).text(), containsString(error));
+        assertThat(Objects.requireNonNull(document.getElementById("error-popup")).text(), containsString(error));
         return this;
     }