Support for checking for non-existent temp data key.

TestStack.FluentMVCTesting.Tests/ControllerExtensionsTests.cs

@@ -53,7 +53,7 @@ public void Check_for_existent_temp_data_property()
         }
 
         [Test]
-        public void Check_for_non_existent_temp_data_property()
+        public void Check_for_unexpected_non_existent_temp_data_property()
         {
             const string key = "";
 
@@ -136,7 +136,7 @@ public void Check_for_existent_temp_data_property_and_check_value_using_invalid_
         }
 
         [Test]
-        public void Check_for_non_existent_temp_data_property_when_supplied_with_predicate()
+        public void Check_for_unexpected_non_existent_temp_data_property_when_supplied_with_predicate()
         {
             const string key = "";
 
@@ -146,5 +146,25 @@ public void Check_for_non_existent_temp_data_property_when_supplied_with_predica
             Assert.That(exception.Message, Is.EqualTo(string.Format(
                 "Expected TempData to have a non-null value with key \"{0}\", but none found.", key)));
         }
+
+        [Test]
+        public void Check_for_non_existent_temp_data_property()
+        {
+            _controller
+                .ShouldNotHaveTempDataProperty("");
+        }
+
+        [Test]
+        public void Check_for_unexpected_existent_temp_data_property()
+        {
+            const string Key = "";
+            _controller.TempData[Key] = "";
+
+            var exception = Assert.Throws<TempDataAssertionException>(() =>
+                _controller.ShouldNotHaveTempDataProperty(Key));
+
+            Assert.That(exception.Message, Is.EqualTo(string.Format(
+                "Expected TempData to have no value with key \"{0}\", but found one.", Key)));
+        }
     }
 }

TestStack.FluentMvcTesting/ControllerExtensions.cs

@@ -104,5 +104,19 @@ public static TempDataResultTest ShouldHaveTempDataProperty<TValue>(this Control
 
             return new TempDataResultTest(controller);
         }
+
+        public static TempDataResultTest ShouldNotHaveTempDataProperty(this Controller controller, string key)
+        {
+            var actual = controller.TempData[key];
+
+            if (actual != null)
+            {
+                throw new TempDataAssertionException(string.Format(
+                    "Expected TempData to have no value with key \"{0}\", but found one.", key));
+            }
+
+            return new TempDataResultTest(controller);
+        }
+
     }
 }