/V4/MVVM RI/MVVM.Client.Tests/ViewModels/NumericQuestionViewModelFixture.cs

//===================================================================================

// Microsoft patterns & practices

// Composite Application Guidance for Windows Presentation Foundation and Silverlight

//===================================================================================

// Copyright (c) Microsoft Corporation.  All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

// FITNESS FOR A PARTICULAR PURPOSE.

//===================================================================================

// The example companies, organizations, products, domain names,

// e-mail addresses, logos, people, places, and events depicted

// herein are fictitious.  No association with any real company,

// organization, product, domain name, email address, logo, person,

// places, or events is intended or should be inferred.

//===================================================================================

using System;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using MVVM.Client.ViewModels;

using MVVM.Questionnaires.Model;



namespace MVVM.Client.Tests.ViewModels

{

    [TestClass]

    public class NumericQuestionViewModelFixture

    {

        [TestMethod]

        public void WhenCreatingAViewModelWithANullQuestion_ThenAnExceptionIsThrown()

        {

            try

            {

                new NumericQuestionViewModel(null);

                Assert.Fail("should have thrown");

            }

            catch (ArgumentNullException)

            {

                // expected

            }

        }



        [TestMethod]

        public void WhenResponseChangesOnTheModel_ThenResponseValueChangeIsFired()

        {

            var question = new NumericQuestionTemplate { MaxValue = 100 }.CreateNewQuestion() as NumericQuestion;

            var viewModel = new NumericQuestionViewModel(question);



            bool responseChangeFired = false;

            viewModel.ResponseChanged += (s, e) => { responseChangeFired = true; };

            question.Response = 15;



            // Assertions

            Assert.IsTrue(responseChangeFired);

        }



        [TestMethod]

        public void WhenHasErrorIsChangedToTrueOnTheViewModel_ThenResponseValueChangeIsFired()

        {

            var question = new NumericQuestionTemplate { MaxValue = 100 }.CreateNewQuestion() as NumericQuestion;

            var viewModel = new NumericQuestionViewModel(question);



            viewModel.HasBindingError = false;

            bool responseChangeFired = false;

            viewModel.ResponseChanged += (s, e) => { responseChangeFired = true; };

            viewModel.HasBindingError = true;



            // Assertions

            Assert.IsTrue(responseChangeFired);

        }



        [TestMethod]

        public void WhenHasErrorIsChangedToFalseOnTheViewModel_ThenResponseValueChangeIsFired()

        {

            var question = new NumericQuestionTemplate { MaxValue = 100 }.CreateNewQuestion() as NumericQuestion;

            var viewModel = new NumericQuestionViewModel(question);



            viewModel.HasBindingError = true;

            bool responseChangeFired = false;

            viewModel.ResponseChanged += (s, e) => { responseChangeFired = true; };

            viewModel.HasBindingError = false;



            // Assertions

            Assert.IsTrue(responseChangeFired);

        }



        [TestMethod]

        public void WhenResponseIsSetOnTheModel_ThenTheHasErrorPropertyInTheViewModelIsCleared()

        {

            var question = new NumericQuestionTemplate { MaxValue = 100 }.CreateNewQuestion() as NumericQuestion;

            var viewModel = new NumericQuestionViewModel(question);



            viewModel.HasBindingError = true;

            int responseChanges = 0;

            viewModel.ResponseChanged += (s, e) => { responseChanges++; };

            question.Response = 15;



            // Assertions

            Assert.IsFalse(viewModel.HasBindingError);

            Assert.AreEqual(1, responseChanges);

        }



        [TestMethod]

        public void WhenCreatingANewViewModel_ThenHasChangesIsFalse()

        {

            var question = new NumericQuestionTemplate { MaxValue = 100 }.CreateNewQuestion() as NumericQuestion;

            var viewModel = new NumericQuestionViewModel(question);



            // Assertions

            Assert.IsFalse(viewModel.HasChanges);

        }



        [TestMethod]

        public void WhenResponseIsSetOnTheModel_ThenHasChangesIsTrue()

        {

            var question = new NumericQuestionTemplate { MaxValue = 100 }.CreateNewQuestion() as NumericQuestion;

            var viewModel = new NumericQuestionViewModel(question);



            question.Response = 15;



            // Assertions

            Assert.IsTrue(viewModel.HasChanges);

        }



        [TestMethod]

        public void WhenViewModelHasErrorIsSet_ThenDoesNotHaveCompletedResponse()

        {

            var question = new NumericQuestionTemplate { MaxValue = 100 }.CreateNewQuestion() as NumericQuestion;

            var viewModel = new NumericQuestionViewModel(question);



            question.Response = 15;

            viewModel.HasBindingError = true;



            // Assertions

            Assert.IsFalse(viewModel.ResponseComplete);

        }

    }

}