Extract duplciated logic for checking for error notifications

Change-Id: I1cc630e9c21b3e73d135129ba3d86f7b22019e0f

uitest/src/com/vaadin/tests/components/accordion/AccordionRemoveComponentTest.java

@@ -15,9 +15,7 @@
  */
 package com.vaadin.tests.components.accordion;
 
-import org.junit.Assert;
 import org.junit.Test;
-import org.openqa.selenium.By;
 
 import com.vaadin.testbench.elements.ButtonElement;
 import com.vaadin.tests.tb3.MultiBrowserTest;
@@ -36,8 +34,7 @@ public class AccordionRemoveComponentTest extends MultiBrowserTest {
 
         $(ButtonElement.class).first().click();
 
-        Assert.assertFalse(
-                "Error notification with client side exception is shown",
-                isElementPresent(By.className("v-Notification-error")));
+        assertNoErrorNotifications();
     }
+
 }

uitest/src/com/vaadin/tests/components/optiongroup/ReadOnlyOptionGroupTest.java

@@ -38,9 +38,7 @@ public class ReadOnlyOptionGroupTest extends MultiBrowserTest {
         WebElement checkboxInput = checkbox.findElement(By.tagName("input"));
         checkboxInput.click();
 
-        Assert.assertFalse("There is a client side exception after unset "
-                + "readonly mode for option group",
-                isElementPresent(By.className("v-Notification-error")));
+        assertNoErrorNotifications();
 
         Assert.assertFalse("Radio button in option group is still disabled "
                 + "after unset reaonly",

uitest/src/com/vaadin/tests/components/popupview/PopupViewWithExtensionTest.java

@@ -15,7 +15,6 @@
  */
 package com.vaadin.tests.components.popupview;
 
-import org.junit.Assert;
 import org.junit.Test;
 import org.openqa.selenium.WebElement;
 
@@ -38,10 +37,7 @@ public class PopupViewWithExtensionTest extends MultiBrowserTest {
         WebElement view = driver.findElement(By.className("v-popupview"));
         view.click();
 
-        Assert.assertFalse(
-                "Popup view with extension should not throw an exception. "
-                        + "(Error notification window is shown).",
-                isElementPresent(By.className("v-Notification-error")));
+        assertNoErrorNotifications();
     }
 
 }

uitest/src/com/vaadin/tests/components/table/DndEmptyTableTest.java

@@ -15,7 +15,6 @@
  */
 package com.vaadin.tests.components.table;
 
-import org.junit.Assert;
 import org.junit.Test;
 import org.openqa.selenium.WebElement;
 import org.openqa.selenium.interactions.Actions;
@@ -42,8 +41,7 @@ public class DndEmptyTableTest extends MultiBrowserTest {
         Actions actions = new Actions(driver);
         actions.clickAndHold(source).moveToElement(target).release();
 
-        Assert.assertFalse(isElementPresent(By
-                .className("v-Notification-error")));
+        assertNoErrorNotifications();
     }
 
 }

uitest/src/com/vaadin/tests/tb3/AbstractTB3Test.java

@@ -1065,4 +1065,21 @@ public abstract class AbstractTB3Test extends ParallelTest {
         Assert.assertFalse("Element is present", isElementPresent(by));
     }
 
+    /**
+     * Asserts that no error notifications are shown. Requires the use of
+     * "?debug" as exceptions are otherwise not shown as notifications.
+     */
+    protected void assertNoErrorNotifications() {
+        Assert.assertTrue(
+                "Debug window must be open to be able to see error notifications",
+                isDebugWindowOpen());
+        Assert.assertFalse(
+                "Error notification with client side exception is shown",
+                isElementPresent(By.className("v-Notification-error")));
+    }
+
+    private boolean isDebugWindowOpen() {
+        return isElementPresent(By.className("v-debugwindow"));
+    }
+
 }