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MVVM for Multi Platforms

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22 Mar 2010CPOL2 min read 26.5K   354   22  
How to implement MVVM when developing a view model whose view implementation language is not certain
using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using Microsoft.VisualStudio.TestTools.UnitTesting;

using GeographicRepresentation.Interfaces;
using GeographicRepresentation.Lib;

namespace GeographicRepresentation.TestLib
{
    /// <summary>
    /// Summary description for UnitTest1
    /// </summary>
    [TestClass]
    public class ViewModelTests
    {
        public ViewModelTests()
        {

            string strDest = string.Format("{0}\\{1}", System.IO.Directory.GetCurrentDirectory(), DataManager.DATA_FILE_NAME);
            string strSource = string.Format("{0}\\..\\..\\..\\Lib\\{1}", System.IO.Directory.GetCurrentDirectory(), DataManager.DATA_FILE_NAME);
            System.IO.Directory.CreateDirectory(string.Format("{0}\\{1}", System.IO.Directory.GetCurrentDirectory(), "Resources"));
            System.IO.File.Copy(strSource, strDest, true);

            //
            // TODO: Add constructor logic here
            //
        }

        private TestContext testContextInstance;

        /// <summary>
        ///Gets or sets the test context which provides
        ///information about and functionality for the current test run.
        ///</summary>
        public TestContext TestContext
        {
            get
            {
                return testContextInstance;
            }
            set
            {
                testContextInstance = value;
            }
        }

        #region Additional test attributes
        //
        // You can use the following additional attributes as you write your tests:
        //
        // Use ClassInitialize to run code before running the first test in the class
        // [ClassInitialize()]
        // public static void MyClassInitialize(TestContext testContext) { }
        //
        // Use ClassCleanup to run code after all tests in a class have run
        // [ClassCleanup()]
        // public static void MyClassCleanup() { }
        //
        // Use TestInitialize to run code before running each test 
        // [TestInitialize()]
        // public void MyTestInitialize() { }
        //
        // Use TestCleanup to run code after each test has run
        // [TestCleanup()]
        // public void MyTestCleanup() { }
        //
        #endregion        

        AutoResetEvent m_Event = new AutoResetEvent(false);
        bool m_bOperationResult;
        

        [TestMethod]
        public void TestCreateAndEditCity()
        {            
            IEditableCityViewModel addVm = InterfacesFactory.Instance.GetEditableCityViewModelForAdd(DataManager.Instance.GetAllContinents().First(c => c.Countries.Count > 0).Countries.First().Id);
            Random r = new Random();

            addVm.CityName = "New York";
            addVm.Population = 	8363710 + r.Next(1000);
            addVm.TimeZone = -5;
            addVm.OnSaveCompleted += this.OperationSaveCompleted;

            int nTime = addVm.GetCurrentTime().Hour;
            addVm.TimeZone++;
            Assert.IsTrue(addVm.GetCurrentTime().Hour == nTime + 1, "Time zone not changed");

            m_bOperationResult = false;         
            
            SimpleOperationDelegate operation = new SimpleOperationDelegate(addVm.Save);            
            operation.BeginInvoke(this.OperationCompleted, operation);
            
            bool b = m_Event.WaitOne(WaitTimeManager.Interval);
            Assert.IsTrue(b, "Operation didn't complete");
            // If the save operation succeeded, take the data for edit
            if (m_bOperationResult)
            {
                IEditableCityViewModel editVm = InterfacesFactory.Instance.GetEditableCityViewModelForEdit(addVm.Id);
                Assert.IsTrue(editVm.CityName == editVm.CityName, "City name was not saved");
                Assert.IsTrue(editVm.Population == editVm.Population, "Population was not saved");
                Assert.IsTrue(editVm.TimeZone == editVm.TimeZone, "Time zone was not saved");
                editVm.CityName = DateTime.Now.ToString();
                editVm.Population = DateTime.Now.Second;
                editVm.TimeZone = (short)DateTime.Now.Minute;
                // The call for cancel can be done syncronosly 
                editVm.Cancel();
                Assert.IsTrue(editVm.CityName == editVm.CityName, "City name was not changed in cancelation");
                Assert.IsTrue(editVm.Population == editVm.Population, "Population was not changed in cancelation");
                Assert.IsTrue(editVm.TimeZone == editVm.TimeZone, "Time zone was not changed in cancelation");
            }
        }

        private void OperationSaveCompleted(bool bSuccess)
        {
            m_bOperationResult = bSuccess;
        }

        private void OperationCompleted(IAsyncResult result)
        {
            m_Event.Set();
            if (result.IsCompleted)
            {
                SimpleOperationDelegate operation = result.AsyncState as SimpleOperationDelegate;
                Assert.IsNotNull(operation, "Invalid object returned to callback");
                operation.EndInvoke(result);
            }
        }

        [TestMethod]
        public void TestCreateAndEditCountry()
        {
            IEditableCountryViewModel addVm = InterfacesFactory.Instance.GetEditableCountryViewModelForAdd(DataManager.Instance.GetAllContinents().First().Id);
            addVm.CountryName = "France";
            addVm.Size = 674843;            
            addVm.BirthRate = 2.02f;
            m_Event = new AutoResetEvent(false);
            m_bOperationResult = false;
            SimpleOperationDelegate operation = new SimpleOperationDelegate(addVm.Save);
            operation.BeginInvoke(this.OperationCompleted, operation);
            bool b = m_Event.WaitOne(WaitTimeManager.Interval);
            Assert.IsTrue(b, "Operation didn't complete");
            // If the save operation succeeded, take the data for edit
            if (m_bOperationResult)
            {
                IEditableCountryViewModel editVm = InterfacesFactory.Instance.GetEditableCountryViewModelForEdit(addVm.Id);
                Assert.IsTrue(addVm.CountryName == editVm.CountryName, "Name wasn't saved");
                Assert.IsTrue(addVm.Size == editVm.Size, "Size wasn't saved");
                Assert.IsTrue(addVm.BirthRate == editVm.BirthRate, "Birth rate wasn't saved");
                editVm.CountryName = DateTime.Now.ToString();
                editVm.Size = DateTime.Now.Minute;
                editVm.BirthRate = (float)(DateTime.Now.Ticks / 2.54);
                // The call for cancel can be done syncronosly 
                editVm.Cancel();                
                Assert.IsTrue(addVm.CountryName == editVm.CountryName, "Name wasn't changed in cancelation");
                Assert.IsTrue(addVm.Size == editVm.Size, "Size wasn't changed in cancelation");
                Assert.IsTrue(addVm.BirthRate == editVm.BirthRate, "Birth rate wasn't changed in cancelation");
            }            
        }

        [TestMethod]
        public void TestCreateAndEditContinent()
        {
            IEditableContinentViewModel addVm = InterfacesFactory.Instance.GetEditableContinentViewModelForAdd();
            addVm.ContinentName = "Asia";
            addVm.NumberOfCountries = 47;
            addVm.BestCityToBeIn = "Bangkok";            
            m_Event = new AutoResetEvent(false);
            m_bOperationResult = false;
            SimpleOperationDelegate operation = new SimpleOperationDelegate(addVm.Save);
            operation.BeginInvoke(this.OperationCompleted, operation);
            bool b = m_Event.WaitOne(WaitTimeManager.Interval);
            Assert.IsTrue(b, "Operation didn't complete");
            // If the save operation succeeded, take the data for edit
            if (m_bOperationResult)
            {
                IEditableContinentViewModel editVm = InterfacesFactory.Instance.GetEditableContinentViewModelForEdit(addVm.Id);
                Assert.IsTrue(addVm.ContinentName == editVm.ContinentName, "Name wasn't saved");
                Assert.IsTrue(addVm.NumberOfCountries == editVm.NumberOfCountries, "Number of countreis wasn't saved");
                Assert.IsTrue(addVm.BestCityToBeIn == editVm.BestCityToBeIn, "Best city to be in wasn't saved");
                editVm.ContinentName = DateTime.Now.ToString();
                editVm.NumberOfCountries = DateTime.Now.Minute;
                editVm.BestCityToBeIn = DateTime.Now.ToString();
                // The call for cancel can be done syncronosly 
                editVm.Cancel();
                Assert.IsTrue(addVm.ContinentName == editVm.ContinentName, "Name wasn't changed in cancelation");
                Assert.IsTrue(addVm.NumberOfCountries == editVm.NumberOfCountries, "Number of countreis wasn't changed in cancelation");
                Assert.IsTrue(addVm.BestCityToBeIn == editVm.BestCityToBeIn, "Best city to be in wasn't changed in cancelation");
            }
        }

        private void DataChanged()
        {
            m_Event.Set();
        }

        /// <summary>
        /// A delegate for removing objects which is used in the following test
        /// </summary>
        /// <param name="obj"></param>
        internal delegate void RemoveObjectDelegate(IReadOnlyViewModel obj);

        [TestMethod]
        public void TestReadOnlyViewModels()
        {
            GeographicRepresentation.Lib.Model.Continent continent = DataManager.Instance.GetAllContinents().First();
            IContinentsListViewModel vm = InterfacesFactory.Instance.GetContinentsListViewModel();
            IReadOnlyContinentViewModel continentVm = vm.Continents.First(c => c.Id == continent.Id);
            continentVm.OnBestCityToBeInChanged += this.DataChanged;
            Assert.IsTrue(continentVm.Countries.Count == continent.Countries.Count, "Invalid number of countries in continent view model");
            bool b = false;
            try
            {                
                continentVm.NumberOfCountries = DateTime.Now.Second;                
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change number of countries");
            }            
            b = false;
            try
            {
                continentVm.ContinentName = DateTime.Now.ToString();
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change name");
            }            
            b = false;
            try
            {
                continentVm.BestCityToBeIn = DateTime.Now.ToString();
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change best city to live in");
            }
            GeographicRepresentation.Lib.Model.Country country = continent.Countries.First();
            IReadonlyCountryViewModel countryVm = continentVm.Countries.First(c => c.Id == country.Id);
            countryVm.OnBirthRateChanged += this.DataChanged;
            Assert.IsTrue(country.Cities.Count == countryVm.Cities.Count, "Invalid number of cities");
            b = false;
            try
            {
                countryVm.CountryName = DateTime.Now.ToString();
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change country name");
            }
            b = false;
            try
            {
                countryVm.Size = DateTime.Now.Second;
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change country size");
            }
            b = false;
            try
            {
                countryVm.BirthRate = (float)(DateTime.Now.Second / 1.01);
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change countries birth rate");
            }
            GeographicRepresentation.Lib.Model.City city = country.Cities.First();
            IReadOnlyCityViewModel cityVm = countryVm.Cities.First(c => c.Id == city.Id);
            b = false;
            try
            {
                cityVm.CityName = DateTime.Now.ToString();
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change city name");
            }
            b = false;
            try
            {
                cityVm.Population = DateTime.Now.Second;
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change city population");
            }
            b = false;
            try
            {
                cityVm.TimeZone = (short)DateTime.Now.Second;
            }
            catch
            {
                b = true;
            }
            if (!b)
            {
                Assert.Fail("Managed to change city time zone");
            }
            RemoveObjectDelegate delg = new RemoveObjectDelegate(vm.RemoveGeographicObject);
            delg.BeginInvoke(cityVm, new AsyncCallback(this.RemoveOperationCompleted), delg);
            b = m_Event.WaitOne(WaitTimeManager.Interval);
            Assert.IsTrue(b, "Operation didn't complete");
            Assert.IsNull(country.Cities.FirstOrDefault(c => c.Id == city.Id), "Failed removing city from view model");
            delg = new RemoveObjectDelegate(vm.RemoveGeographicObject);
            delg.BeginInvoke(countryVm, new AsyncCallback(this.RemoveOperationCompleted), delg);
            b = m_Event.WaitOne(WaitTimeManager.Interval);
            Assert.IsTrue(b, "Operation didn't complete");
            continent = DataManager.Instance.GetContinent(continent.Id);
            Assert.IsNull(continent.Countries.FirstOrDefault(c => c.Id == country.Id), "Failed removing country from view model");
            delg = new RemoveObjectDelegate(vm.RemoveGeographicObject);
            delg.BeginInvoke(continentVm, new AsyncCallback(this.RemoveOperationCompleted), delg);
            b = m_Event.WaitOne(WaitTimeManager.Interval);
            Assert.IsTrue(b, "Operation didn't complete");
            vm = InterfacesFactory.Instance.GetContinentsListViewModel();
            Assert.IsNull(vm.Continents.FirstOrDefault(c => c.Id == continent.Id), "Failed removing continent from view model");
        }

        private void RemoveOperationCompleted(IAsyncResult result)
        {
            m_Event.Set();
            if (result.IsCompleted)
            {
                RemoveObjectDelegate operation = result.AsyncState as RemoveObjectDelegate;
                Assert.IsNotNull(operation, "Invalid object returned to callback");
                operation.EndInvoke(result);
            }
        }
    }
}

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Software Developer in a promising Clean-Tech company

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