diff --git a/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java b/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java
index b33f16b..cb68236 100644
--- a/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java
+++ b/src/test/java/com/ysoft/geecon/AuthCodeGrantTest.java
@@ -46,7 +46,7 @@ public class AuthCodeGrantTest {
         AuthorizationCodeFlow flow = new AuthorizationCodeFlow(authUrl, CLIENT);
         LoginScreen loginScreen = flow.start(Map.of("scope", "scope1 scope2"));
 
-        ConsentScreen consentScreen = loginScreen.submitCorrect("bob", "password");
+        ConsentScreen consentScreen = loginScreen.submit("bob", "password").expectSuccess();
         assertThat(consentScreen.getScopes(), is(List.of("scope1", "scope2")));
 
         Document submit = consentScreen.submit();
@@ -72,7 +72,7 @@ public class AuthCodeGrantTest {
         AuthorizationCodeFlow flow = new AuthorizationCodeFlow(authUrl, CLIENT);
         LoginScreen loginScreen = flow.start(Map.of("response_type", "token", "scope", "scope1 scope2"));
 
-        ConsentScreen consentScreen = loginScreen.submitCorrect("bob", "password");
+        ConsentScreen consentScreen = loginScreen.submit("bob", "password").expectSuccess();
         assertThat(consentScreen.getScopes(), is(List.of("scope1", "scope2")));
 
         Document submit = consentScreen.submit();
@@ -87,7 +87,7 @@ public class AuthCodeGrantTest {
         flow.setPkce("PnRLncOTibrwxaBmBYm4QC89u0m4mz518sk1WFKjxnc", "bbb");
         LoginScreen loginScreen = flow.start(Map.of("scope", "scope1 scope2"));
 
-        ConsentScreen consentScreen = loginScreen.submitCorrect("bob", "password");
+        ConsentScreen consentScreen = loginScreen.submit("bob", "password").expectSuccess();
         assertThat(consentScreen.getScopes(), is(List.of("scope1", "scope2")));
 
         Document submit = consentScreen.submit();
diff --git a/src/test/java/com/ysoft/geecon/DeviceAuthGrantTest.java b/src/test/java/com/ysoft/geecon/DeviceAuthGrantTest.java
index b6570fc..2dcb77f 100644
--- a/src/test/java/com/ysoft/geecon/DeviceAuthGrantTest.java
+++ b/src/test/java/com/ysoft/geecon/DeviceAuthGrantTest.java
@@ -56,7 +56,7 @@ public class DeviceAuthGrantTest {
         DeviceCodeScreen deviceCodeScreen = new DeviceCodeScreen(deviceResponse.verificationUri());
         LoginScreen loginScreen = deviceCodeScreen.enterCode(deviceResponse.userCode());
 
-        ConsentScreen consentScreen = loginScreen.submitCorrect("bob", "password");
+        ConsentScreen consentScreen = loginScreen.submit("bob", "password").expectSuccess();
         consentScreen.submit();
 
         AccessTokenResponse accessTokenResponse = flow.exchangeDeviceCode().expectTokens();
diff --git a/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java b/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java
index 2c6a2c3..aa75775 100644
--- a/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java
+++ b/src/test/java/com/ysoft/geecon/helpers/LoginScreen.java
@@ -4,6 +4,10 @@ import org.jsoup.nodes.Document;
 import org.jsoup.nodes.FormElement;
 
 import java.io.IOException;
+import java.util.Objects;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
 
 public class LoginScreen {
 
@@ -13,20 +17,32 @@ public class LoginScreen {
         this.form = doc.expectForm("form");
     }
 
-    public Document submit(String username, String password) throws IOException {
+    public Result submit(String username, String password) throws IOException {
         form.getElementsByAttributeValue("name", "username").val(username);
         form.getElementsByAttributeValue("name", "password").val(password);
 
-        return form.submit().post();
+        var document = form.submit().post();
+        return new Result() {
+            @Override
+            public ConsentScreen expectSuccess() {
+                return new ConsentScreen(document);
+            }
+
+            @Override
+            public LoginScreen expectError(String error) {
+                return new LoginScreen(document).expectError(error);
+            }
+        };
     }
 
-    public ConsentScreen submitCorrect(String username, String password) throws IOException {
-        Document posted = submit(username, password);
-        return new ConsentScreen(posted);
+    private LoginScreen expectError(String error) {
+        assertThat(Objects.requireNonNull(form.getElementById("error-popup")).text(), containsString(error));
+        return this;
     }
 
-    public LoginScreen submitWrong(String username, String password) throws IOException {
-        Document posted = submit(username, password);
-        return new LoginScreen(posted);
+    public interface Result {
+        ConsentScreen expectSuccess();
+
+        LoginScreen expectError(String error);
     }
 }