1 files changed, 40 insertions, 0 deletions
diff --git a/server/tests/src/com/vaadin/tests/server/ExtensionTest.java b/server/tests/src/com/vaadin/tests/server/ExtensionTest.java
new file mode 100644
index 0000000000..8f8e8dcb59
--- /dev/null
+++ b/server/tests/src/com/vaadin/tests/server/ExtensionTest.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.server;
+
+import org.junit.Test;
+
+import com.vaadin.server.AbstractClientConnector;
+import com.vaadin.server.AbstractExtension;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.TextField;
+
+public class ExtensionTest {
+
+    public static class DummyExtension extends AbstractExtension {
+        public DummyExtension(AbstractClientConnector target) {
+            super(target);
+        }
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testRemoveExtensionFromWrongConnector() {
+        Label l = new Label();
+        TextField t = new TextField();
+        t.removeExtension(new DummyExtension(l));
+    }
+
+}