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

// 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 System.Linq;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using MVVM.Client.ViewModels;

using MVVM.Questionnaires.Model;

using MVVM.TestSupport;



namespace MVVM.Client.Tests.ViewModels

{

    [TestClass]

    public class OpenQuestionViewModelFixture

    {

        [TestMethod]

        public void WhenCreatingAViewModelWithANullQuestion_ThenAnExceptionIsThrown()

        {

            try

            {

                new OpenQuestionViewModel(null);

                Assert.Fail("should have thrown");

            }

            catch (ArgumentNullException)

            {

                // expected

            }

        }



        [TestMethod]

        public void ViewModelHasMaxLengthAsTheAvailableLength()

        {

            var question = new OpenQuestionTemplate { QuestionText = "Question", MaxLength = 25 }.CreateNewQuestion() as OpenQuestion;

            var viewModel = new OpenQuestionViewModel(question);



            Assert.AreEqual(25, viewModel.AvailableLength);

        }



        [TestMethod]

        public void WhenSettingTheResponseTextPropertyOnTheModel_ThenAvailableLengthIsUpdatedOnTheViewModel()

        {

            var question = new OpenQuestionTemplate { QuestionText = "Question", MaxLength = 25 }.CreateNewQuestion() as OpenQuestion;

            var viewModel = new OpenQuestionViewModel(question);



            question.Response = "1234567890";



            Assert.AreEqual(15, viewModel.AvailableLength);

        }



        [TestMethod]

        public void WhenSettingTheResponseTextPropertyOnTheModel_ThenAChangeOnAvailableLengthIsNotifiedOnTheViewModel()

        {

            var question = new OpenQuestionTemplate { QuestionText = "Question", MaxLength = 25 }.CreateNewQuestion() as OpenQuestion;

            var viewModel = new OpenQuestionViewModel(question);



            var changeTracker = new PropertyChangeTracker(viewModel);

            question.Response = "1234567890";



            Assert.IsTrue(changeTracker.ChangedProperties.Contains("AvailableLength"));

        }



        [TestMethod]

        public void WhenSettingTheResponseTextPropertyOnTheModel_ThenTheViewModelNotifiesAResponseChange()

        {

            var question = new OpenQuestionTemplate { QuestionText = "Question", MaxLength = 25 }.CreateNewQuestion() as OpenQuestion;

            var viewModel = new OpenQuestionViewModel(question);



            bool responseChanged = false;

            viewModel.ResponseChanged += (s, e) => responseChanged = true;

            question.Response = "1234567890";



            Assert.IsTrue(responseChanged);

        }



        [TestMethod]

        public void WhenCreatingTheViewModel_ThenHasChangesIsFalse()

        {

            var question = new OpenQuestionTemplate { QuestionText = "Question", MaxLength = 25 }.CreateNewQuestion() as OpenQuestion;

            var viewModel = new OpenQuestionViewModel(question);



            Assert.IsFalse(viewModel.HasChanges);

        }



        [TestMethod]

        public void WhenSettingTheResponseOntheModel_ThenViewModelHasChanges()

        {

            var question = new OpenQuestionTemplate { QuestionText = "Question", MaxLength = 25 }.CreateNewQuestion() as OpenQuestion;

            var viewModel = new OpenQuestionViewModel(question);



            question.Response = "1234567890";



            Assert.IsTrue(viewModel.HasChanges);

        }

    }

}