// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

#include "pch.h"
#include <WexTestClass.h>
#include "UnitConverterViewModelUnitTests.h"

#include "CalcViewModel\UnitConverterViewModel.h"
#include "CalcViewModel\DataLoaders\UnitConverterDataLoader.h"

using namespace CalculatorApp;
using namespace CalculatorApp::Common;
using namespace CalculatorApp::ViewModel;
using namespace Platform;
using namespace Platform::Collections;
using namespace std;
using namespace Utils;
using namespace Windows::ApplicationModel::Resources;
using namespace Windows::Foundation::Collections;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Data;

namespace UCM = UnitConversionManager;
namespace VM = CalculatorApp::ViewModel;
using namespace Windows::Globalization;

namespace CalculatorUnitTests
{
    String^ AddUnicodeLTRMarkers(wstring str)
    {
        str.insert(str.begin(), L'\u202a');
        str.push_back(L'\u202c');
        return ref new String(str.c_str());
    }

    class CategoryViewModelTests
    {
    public:
        TEST_CLASS(CategoryViewModelTests);

        // Test all binding values:

        TEST_METHOD(TestGetNameReturnsCorrectName)
        {
            wstring name = L"TestName";
            UCM::Category cat;
            cat.name = name;
            VM::Category^ vmcat = ref new VM::Category(cat);
            VERIFY_ARE_EQUAL(vmcat->Name->Data(), name);
        }

        TEST_METHOD(TestGetVisibilityReturnsVisible)
        {
            UCM::Category cat;
            cat.supportsNegative = true;
            VM::Category^ vmcat = ref new VM::Category(cat);
            VERIFY_IS_TRUE(Visibility::Visible == vmcat->NegateVisibility);
        }

        TEST_METHOD(TestGetVisibilityReturnsCollapsed)
        {
            UCM::Category cat;
            cat.supportsNegative = false;
            VM::Category^ vmcat = ref new VM::Category(cat);
            VERIFY_IS_TRUE(Visibility::Collapsed == vmcat->NegateVisibility);
        }
    };

    class UnitViewModelTests
    {
    public:
        TEST_CLASS(UnitViewModelTests);

        // Test all binding values:

        TEST_METHOD(TestGetNameReturnsCorrectName)
        {
            wstring name = L"TestName";
            UCM::Unit unit;
            unit.name = name;
            VM::Unit^ vmunit = ref new VM::Unit(unit);
            VERIFY_ARE_EQUAL(vmunit->Name->Data(), name);
        }

        TEST_METHOD(TestGetAbbreviationReturnsCorrectAbbreviation)
        {
            wstring abbr = L"TestName";
            UCM::Unit unit;
            unit.abbreviation = abbr;
            VM::Unit^ vmunit = ref new VM::Unit(unit);
            VERIFY_ARE_EQUAL(vmunit->Abbreviation->Data(), abbr);
        }
    };

    class SupplementaryResultsViewModelTests
    {
    public:
        TEST_CLASS(SupplementaryResultsViewModelTests);

        // Test all binding values:

        TEST_METHOD(TestGetValueReturnsCorrectValue)
        {
            wstring value = L"TestName";
            UCM::Unit unit = { 1, L"", L"", false, false, false };
            VM::Unit^ vmunit = ref new VM::Unit(unit);
            VM::SupplementaryResult^ vmsupp = ref new VM::SupplementaryResult(ref new String(value.c_str()), vmunit);
            VERIFY_ARE_EQUAL(vmsupp->Value->Data(), value);
        }

        TEST_METHOD(TestGetUnitNameReturnsCorrectValue)
        {
            wstring name = L"TestName";
            UCM::Unit unit = { 1, name, L"", false, false, false };
            unit.name = name;
            VM::Unit^ vmunit = ref new VM::Unit(unit);
            VM::SupplementaryResult^ vmsupp = ref new VM::SupplementaryResult(L"", vmunit);
            VERIFY_ARE_EQUAL(vmsupp->Unit->Name->Data(), name);
        }

        TEST_METHOD(TestGetIsWhimsicalReturnsCorrectValue)
        {
            UCM::Unit unit = { 1, L"", L"", false, false, false };
            UCM::Unit unitW = { 2, L"", L"", false, false, true };
            VM::Unit^ vmUnit = ref new VM::Unit(unit);
            VM::Unit^ vmUnitW = ref new VM::Unit(unitW);
            VM::SupplementaryResult^ vmsupp = ref new VM::SupplementaryResult(L"", vmUnit);
            VM::SupplementaryResult^ vmsuppW = ref new VM::SupplementaryResult(L"", vmUnitW);
            VERIFY_IS_FALSE(vmsupp->IsWhimsical());
            VERIFY_IS_TRUE(vmsuppW->IsWhimsical());
        }
    };

    UnitConverterMock::UnitConverterMock() :
            m_initCallCount(0),
            m_getCategoriesCallCount(0),
            m_setCurrentCategoryCallCount(0),
            m_setCurUnitTypesCallCount(0),
            m_switchActiveCallCount(0),
            m_sendCommandCallCount(0),
            m_setVMCallbackCallCount(0),
            m_serializeCallCount(0),
            m_deSerializeCallCount(0)
        { }

        // IUnitConverter

    void UnitConverterMock::Initialize()
    {
        m_initCallCount++;
    }

    vector<UCM::Category> UnitConverterMock::GetCategories()
        {
            m_getCategoriesCallCount++;

            vector<UCM::Category> cats;
            cats.push_back(CAT1);
            cats.push_back(CAT2);
            cats.push_back(CAT3);

            m_curCategory = CAT2;

            return cats;
        }

    UCM::CategorySelectionInitializer UnitConverterMock::SetCurrentCategory(const UCM::Category& input)
        {
            m_setCurrentCategoryCallCount++;
            m_curCategory = input;
            vector<UCM::Unit> units;
            switch (input.id)
            {
            case 1:
            {
                units.push_back(UNIT1);
                units.push_back(UNIT2);
                units.push_back(UNIT3);
                break;
            }
            case 2:
            {
                units.push_back(UNIT4);
                units.push_back(UNIT5);
                units.push_back(UNIT6);
                break;
            }
            case 3:
            {
                units.push_back(UNIT7);
                units.push_back(UNIT8);
                units.push_back(UNIT9);
                break;
            }
            default:
                throw;
            }

            for (const UCM::Unit& unit : units)
            {
                if (unit.isConversionSource)
                {
                    m_curFrom = unit;
                }

                if (unit.isConversionTarget)
                {
                    m_curTo = unit;
                }
            }

            units.push_back(UNITWHIMSY);    // needs to be filtered out

            return make_tuple(units, m_curFrom, m_curTo);
        }

    UCM::Category UnitConverterMock::GetCurrentCategory()
        {
            return m_curCategory;
        }

    void UnitConverterMock::SetCurrentUnitTypes(const UCM::Unit& fromType, const UCM::Unit& toType)
        {
            m_setCurUnitTypesCallCount++;
            m_curFrom = fromType;
            m_curTo = toType;
            m_vmCallback->SuggestedValueCallback(m_suggestedList);
        }

    void UnitConverterMock::SwitchActive(const std::wstring& newValue)
        {
            m_switchActiveCallCount++;
            m_curValue = newValue;
        }

    wstring UnitConverterMock::Serialize()
        {
            m_serializeCallCount++;
            return wstring(L"");
        }

    void UnitConverterMock::DeSerialize(const wstring& serializedData)
        {
            m_deSerializeCallCount++;
        }

    std::wstring UnitConverterMock::SaveUserPreferences()
        {
            return L"TEST";
        };

    void UnitConverterMock::RestoreUserPreferences(_In_ const std::wstring& userPreferences)
        {
        };

    void UnitConverterMock::SendCommand(UCM::Command command)
        {
            m_sendCommandCallCount++;
            m_lastCommand = command;

            m_vmCallback->SuggestedValueCallback(m_suggestedList);
        }

    void UnitConverterMock::SetViewModelCallback(const shared_ptr<UCM::IUnitConverterVMCallback>& newCallback)
        {
            m_setVMCallbackCallCount++;
            m_vmCallback = newCallback;
        }

    ref class MockActivatable sealed : public VM::IActivatable
    {
    private:
        bool m_active;

    public:
        MockActivatable(bool active) : m_active(active)
        { }

        virtual property bool IsActive
        {
            bool get() { return m_active; }
            void set(bool value) { m_active = value; }
        }
    };

    class UnitConverterDataLoaderTests
    {
    public:
        TEST_CLASS(UnitConverterDataLoaderTests);

        TEST_METHOD(FuncUnitConverterAllUnitCombinations)
        {
            VM::UnitConverterViewModel^ vm = ref new UnitConverterViewModel(make_shared<UnitConversionManager::UnitConverter>(make_shared<UnitConverterDataLoader>(ref new GeographicRegion()), nullptr));
            IObservableVector<Category^>^ categoryList = vm->Categories;
            ResourceLoader^ m_resLoader = ResourceLoader::GetForViewIndependentUse("Test");
            double epsilon = 0.1; //Could be more precise like 0.001 except atm to pascal conversion

            for (unsigned int k = 0; k < categoryList->Size; k++)
            {
                vm->CurrentCategory = categoryList->GetAt(k);
                IObservableVector<Unit^>^ unitList = vm->Units;
                for (unsigned int i = 0; i < unitList->Size; i++)
                {
                    vm->Unit1 = unitList->GetAt(i);
                    wstring unit1Name = vm->Unit1->Name->Data();
                    for (unsigned int j = 0; j < unitList->Size; j++)
                    {
                        vm->Value2Active = true;
                        vm->Value1Active = false;
                        vm->Unit2 = unitList->GetAt(j);
                        wstring unit2Name = vm->Unit2->Name->Data();
                        //change value2 as 1.
                        vm->ButtonPressed->Execute(NumbersAndOperatorsEnum::One);
                        String^ expectedResult = m_resLoader->GetString(ref new String((unit1Name + L"-" + unit2Name).c_str()));

                        // if the corresponding conversion ratio is present in Test.resw file
                        if (expectedResult != nullptr)
                        {
                            wstring expResult = expectedResult->Data();

                            double expectedConversion = GetDoubleFromWstring(expResult);
                            double actualConversion = GetDoubleFromWstring(GetStringValue(vm->Value1)->Data());
                            double diff = abs(expectedConversion - actualConversion);

                            // assert for diff less than epsilonth fraction of expected conversion result
                            VERIFY_IS_LESS_THAN_OR_EQUAL(diff, epsilon*expectedConversion);
                        }
                        //clearing the value1
                        vm->ButtonPressed->Execute(NumbersAndOperatorsEnum::Clear);
                    }
                }
            }
        }
    };

    class UnitConverterViewModelTests
    {
    public:
        TEST_CLASS(UnitConverterViewModelTests);

        // Test that the ctor makes value1 active and value2 passive
        TEST_METHOD(TestUnitConverterCtorSetsUpCorrectActiveValue)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            VERIFY_IS_TRUE(vm.Value1Active);
            VERIFY_IS_FALSE(vm.Value2Active);
        }

        // Test that we've created all the vectors on init.
        TEST_METHOD(TestUnitConverterCtorSetsUpVectors)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            VERIFY_IS_NOT_NULL(vm.Categories);
            VERIFY_IS_NOT_NULL(vm.Units);
            VERIFY_IS_NOT_NULL(vm.SupplementaryResults);
        }

        // Test that we've set up all the display callbacks on init.
        TEST_METHOD(TestUnitConverterLoadSetsUpCallbacks)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_setVMCallbackCallCount);
        }

        // Test that we've set up all categories on load and that the first 
        // category is selected.
        TEST_METHOD(TestUnitConverterLoadSetsUpCategories)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            IObservableVector<VM::Category^>^ cats = vm.Categories;
            VERIFY_ARE_EQUAL((UINT)1, mock->m_getCategoriesCallCount);
            VERIFY_ARE_EQUAL((UINT)3, cats->Size);
            // Verify that we match current category
            VERIFY_IS_TRUE(CAT2 == vm.CurrentCategory->GetModelCategory());
        }

        // Test that we've set up all units on load and that the default
        // units are selected.
        TEST_METHOD(TestUnitConverterLoadSetsUpUnits)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();

            VM::UnitConverterViewModel vm(mock);
            IObservableVector<VM::Unit^>^ units = vm.Units;
            VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurrentCategoryCallCount);
            VERIFY_ARE_EQUAL((UINT)3, units->Size);
            VERIFY_IS_TRUE(UNIT4 == vm.Unit1->GetModelUnit());
            VERIFY_IS_TRUE(UNIT6 == vm.Unit2->GetModelUnit());
            VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurUnitTypesCallCount);
            VERIFY_IS_TRUE(mock->m_curFrom == UNIT4);
            VERIFY_IS_TRUE(mock->m_curTo == UNIT6);
        }

        // Test that changing units updates the current unit types
        // in the model
        TEST_METHOD(TestUnitSelectionChangeUpdatesModel)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vm.Unit1 = vm.Units->GetAt(1);  // Change from u4 to u5
                                            // count will be 2 here since it was already called once at init
            VERIFY_ARE_EQUAL((UINT)2, mock->m_setCurUnitTypesCallCount);
            VERIFY_IS_TRUE(UNIT5 == mock->m_curFrom);
            VERIFY_IS_TRUE(UNIT6 == mock->m_curTo);
            vm.Unit2 = vm.Units->GetAt(0);  // Change from u3 to u1
            VERIFY_ARE_EQUAL((UINT)3, mock->m_setCurUnitTypesCallCount);
            VERIFY_IS_TRUE(UNIT5 == mock->m_curFrom);
            VERIFY_IS_TRUE(UNIT4 == mock->m_curTo);
        }

        // Test that changing categories updates the unit list
        TEST_METHOD(TestCategorySelectionChangeUpdatesUnits)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vm.CurrentCategory = vm.Categories->GetAt(2);   // Change from cat1 to cat3
                                                            // counts will be 2 here since the first call should have happened during init
            VERIFY_IS_GREATER_THAN_OR_EQUAL(2u, mock->m_setCurrentCategoryCallCount);
            VERIFY_ARE_EQUAL((UINT)3, vm.Units->Size);
            VERIFY_IS_TRUE(UNIT7 == vm.Units->GetAt(0)->GetModelUnit());
            VERIFY_IS_TRUE(UNIT8 == vm.Units->GetAt(1)->GetModelUnit());
            VERIFY_IS_TRUE(UNIT9 == vm.Units->GetAt(2)->GetModelUnit());
        }

        // Test that changing categories updates the current unit types
        // in the model
        TEST_METHOD(TestCategorySelectionChangeUpdatesModel)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vm.CurrentCategory = vm.Categories->GetAt(2);   // Change from cat1 to cat3
                                                            // counts will be 2 here since the first call should have happened during init
            VERIFY_IS_GREATER_THAN_OR_EQUAL(2u, mock->m_setCurrentCategoryCallCount);
            VERIFY_IS_TRUE(UNIT9 == vm.Unit1->GetModelUnit());
            VERIFY_IS_TRUE(UNIT7 == vm.Unit2->GetModelUnit());
            VERIFY_IS_GREATER_THAN_OR_EQUAL(2u, mock->m_setCurUnitTypesCallCount);
            VERIFY_IS_TRUE(UNIT9 == mock->m_curFrom);
            VERIFY_IS_TRUE(UNIT7 == mock->m_curTo);
        }

        // Test that the displaycallback updates the display values
        TEST_METHOD(TestDisplayCallbackUpdatesDisplayValues)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1234", *vTo = L"56.78";
            vm.UpdateDisplay(vFrom, vTo);
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(L"1,234"));
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(vTo));
        }

        // Test that the calculator button command correctly fires
        // commands to the model.
        TEST_METHOD(TestButtonCommandFiresModelCommands)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            // Call count is being set to 1 because we send 'CE' command as the first call 
            UINT callCount = 1;

            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Zero);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Zero == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::One);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::One == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Two);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Two == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Three);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Three == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Four);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Four == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Five);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Five == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Six);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Six == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Seven);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Seven == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Eight);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Eight == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Nine);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Nine == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Decimal);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Decimal == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Negate);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Negate == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Backspace);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Backspace == mock->m_lastCommand);
            vm.ButtonPressed->Execute(CalculatorApp::NumbersAndOperatorsEnum::Clear);
            VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Clear == mock->m_lastCommand);

            for (NumbersAndOperatorsEnum button = NumbersAndOperatorsEnum::Add; button <= NumbersAndOperatorsEnum::None; button++)
            {
                if (button == NumbersAndOperatorsEnum::Decimal ||
                    button == NumbersAndOperatorsEnum::Negate ||
                    button == NumbersAndOperatorsEnum::Backspace)
                {
                    continue;
                }
                vm.ButtonPressed->Execute(button);
                VERIFY_ARE_EQUAL(++callCount, mock->m_sendCommandCallCount);
                VERIFY_IS_TRUE(UCM::Command::None == mock->m_lastCommand);
            }
        }

        // Tests that when we fire the OnGotFocus, it activates the given control
        TEST_METHOD(TestOnValueGotFocusActivatesControl)
        {
            //shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            //VM::UnitConverterViewModel vm(mock);
            //MockActivatable^ activatable = ref new MockActivatable(false);
            //vm.OnValueGotFocus(AsActivatable(activatable));
            //VERIFY_IS_TRUE(activatable->IsActive);
            //vm.OnValueGotFocus(AsActivatable(activatable)); // try again, starting with true
            //VERIFY_IS_TRUE(activatable->IsActive);
        }

        // Tests that when we select the currently active value, nothing
        // happens
        TEST_METHOD(TestReselectCurrentlyActiveValueDoesNothing)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            // Establish base condition
            VERIFY_ARE_EQUAL((UINT)0, mock->m_switchActiveCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_sendCommandCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurUnitTypesCallCount);
            vm.Value1Active = true;
            VERIFY_ARE_EQUAL((UINT)0, mock->m_switchActiveCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_sendCommandCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurUnitTypesCallCount);
        }

        // Tests that when we set switch the active value, it sets the oppsite value
        // to inactive
        TEST_METHOD(TestActivatingValueDeactivatesOther)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vm.Value1Active = true; // base
            VERIFY_IS_TRUE(vm.Value1Active);
            VERIFY_IS_FALSE(vm.Value2Active);
            vm.Value2Active = true; // change
            VERIFY_IS_TRUE(vm.Value2Active);
            VERIFY_IS_FALSE(vm.Value1Active);
            vm.Value2Active = true; // setting it to true again doesnt change anything
            VERIFY_IS_TRUE(vm.Value2Active);
            VERIFY_IS_FALSE(vm.Value1Active);
            vm.Value1Active = true; // back to 1
            VERIFY_IS_TRUE(vm.Value1Active);
            VERIFY_IS_FALSE(vm.Value2Active);
        }

        // Tests that when we switch the active value, the active value
        // gets updated in the model
        TEST_METHOD(TestSwitchActiveValueUpdatesActiveValueInModel)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            VERIFY_ARE_EQUAL((UINT)1, mock->m_switchActiveCallCount);
            VERIFY_ARE_EQUAL(0, mock->m_curValue.compare(vTo));
        }

        // Tests that the suggested visibility value gets updated correctly
        TEST_METHOD(TestSuggestedVisibilityIsUpdated)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            VERIFY_IS_TRUE(Visibility::Collapsed == vm.SupplementaryVisibility);
            vector<tuple<wstring, UCM::Unit>> supp;
            supp.push_back(tuple<wstring, UCM::Unit>(L"1", UNIT1));
            vm.UpdateSupplementaryResults(supp);
            WaitForSingleObjectEx(GetCurrentThread(), 1100, FALSE);
            VERIFY_IS_TRUE(Visibility::Visible == vm.SupplementaryVisibility);
            vm.UpdateSupplementaryResults(vector<tuple<wstring, UCM::Unit>>());
            WaitForSingleObjectEx(GetCurrentThread(), 1100, FALSE);
            VERIFY_IS_TRUE(Visibility::Collapsed == vm.SupplementaryVisibility);
        }

        // Tests that when we switch the active field and get display
        // updates, the correct values are being updated.
        TEST_METHOD(TestDisplayValueUpdatesAfterSwitchingActiveUpdateTheRightDisplay)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            const WCHAR * newvFrom = L"3", *newvTo = L"57";
            vm.UpdateDisplay(newvFrom, newvTo);
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(newvFrom));
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(newvTo));
        }

        // Tests that when we switch the active field and get change units,
        // the correct unit values are being passed.
        TEST_METHOD(TestUnitChangeAfterSwitchingActiveUpdateUnitsCorrectly)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            vm.Unit2 = vm.Units->GetAt(0);
            VERIFY_IS_TRUE(UNIT4 == mock->m_curFrom);
            vm.Unit1 = vm.Units->GetAt(2);
            VERIFY_IS_TRUE(UNIT6 == mock->m_curTo);
        }

        // Test that if we switch categories and come back, our first
        // and second units are still the same
        TEST_METHOD(TestCategorySwitchAndBackKeepsUnitsUnchanged)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.CurrentCategory = vm.Categories->GetAt(2);
            vm.CurrentCategory = vm.Categories->GetAt(0);
            VERIFY_IS_TRUE(UNIT1 == vm.Unit1->GetModelUnit());
            VERIFY_IS_TRUE(UNIT2 == vm.Unit2->GetModelUnit());
        }

        // Test that if we switch categories and active, and then
        // come back, our first and second units are swapped
        // and second unit is active
        TEST_METHOD(TestCategoryAndActiveSwitchAndBack)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.CurrentCategory = vm.Categories->GetAt(2);
            vm.Value2Active = true;
            vm.CurrentCategory = vm.Categories->GetAt(0);
            VERIFY_IS_TRUE(UNIT2 == vm.Unit1->GetModelUnit());
            VERIFY_IS_TRUE(UNIT1 == vm.Unit2->GetModelUnit());
            VERIFY_IS_TRUE(vm.Value2Active);
        }

        // Tests that when we switch the active field and then change
        // category, the correct units are displayed.
        TEST_METHOD(TestCategoryChangeAfterSwitchingActiveUpdatesDisplayCorrectly)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            vm.CurrentCategory = vm.Categories->GetAt(2);
            VERIFY_IS_TRUE(UNIT7 == vm.Unit1->GetModelUnit());
            VERIFY_IS_TRUE(UNIT9 == vm.Unit2->GetModelUnit());
            VERIFY_IS_TRUE(UNIT9 == mock->m_curFrom);
            VERIFY_IS_TRUE(UNIT7 == mock->m_curTo);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_switchActiveCallCount);
            const wchar_t * newvFrom = L"5", *newvTo = L"7";
            vm.UpdateDisplay(newvFrom, newvTo);
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(newvFrom));
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(newvTo));
        }

        // Repeat above active switch tests but with a second switch to ensure
        // transitions work both ways.
        TEST_METHOD(TestSwitchAndReselectCurrentlyActiveValueDoesNothing)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            // Establish base condition
            VERIFY_ARE_EQUAL((UINT)1, mock->m_switchActiveCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_sendCommandCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurUnitTypesCallCount);
            vm.Value2Active = true;
            VERIFY_ARE_EQUAL((UINT)1, mock->m_switchActiveCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_sendCommandCallCount);
            VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurUnitTypesCallCount);
        }

        TEST_METHOD(TestSwitchActiveValueTwiceUpdatesActiveValueInModel)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            vm.Value1Active = true;
            VERIFY_ARE_EQUAL((UINT)2, mock->m_switchActiveCallCount);
            VERIFY_ARE_EQUAL(0, mock->m_curValue.compare(vFrom));
        }

        TEST_METHOD(TestDisplayValueUpdatesAfterSwitchingActiveTwiceUpdateTheRightDisplay)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            vm.Value1Active = true;
            const WCHAR * newvFrom = L"3", *newvTo = L"57";
            vm.UpdateDisplay(newvFrom, newvTo);
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(newvFrom));
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(newvTo));
        }

        TEST_METHOD(TestUnitChangeAfterSwitchingActiveTwiceUpdateUnitsCorrectly)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            vm.Value1Active = true;
            vm.Unit2 = vm.Units->GetAt(0);
            VERIFY_IS_TRUE(UNIT4 == mock->m_curTo);
            vm.Unit1 = vm.Units->GetAt(2);
            VERIFY_IS_TRUE(UNIT6 == mock->m_curFrom);
        }

        TEST_METHOD(TestCategoryChangeAfterSwitchingActiveTwiceUpdatesDisplayCorrectly)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"1", *vTo = L"234";
            vm.UpdateDisplay(vFrom, vTo);
            vm.Value2Active = true;
            vm.Value1Active = true;
            vm.CurrentCategory = vm.Categories->GetAt(2);
            VERIFY_IS_TRUE(UNIT9 == vm.Unit1->GetModelUnit());
            VERIFY_IS_TRUE(UNIT7 == vm.Unit2->GetModelUnit());
            VERIFY_IS_TRUE(UNIT9 == mock->m_curFrom);
            VERIFY_IS_TRUE(UNIT7 == mock->m_curTo);
            VERIFY_ARE_EQUAL((UINT)2, mock->m_switchActiveCallCount);
            const wchar_t * newvFrom = L"5", *newvTo = L"7";
            vm.UpdateDisplay(newvFrom, newvTo);
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(newvFrom));
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(newvTo));
        }

        // There is a 100 ms fudge time for the time based tests below

        // Test that UpdateSupplementaryResults updates the supplementary results
        // after a delay
        TEST_METHOD(TestSuggestedValuesCallbackUpdatesSupplementaryResults)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vector<tuple<wstring, UCM::Unit>> supp;
            supp.push_back(tuple<wstring, UCM::Unit>(L"1", UNIT1));
            supp.push_back(tuple<wstring, UCM::Unit>(L"2", UNIT2));
            supp.push_back(tuple<wstring, UCM::Unit>(L"3", UNIT3));
            vm.UpdateSupplementaryResults(supp);
            VERIFY_ARE_EQUAL((UINT)0, vm.SupplementaryResults->Size);
            WaitForSingleObjectEx(GetCurrentThread(), 200, FALSE);
            // Now we should see it
            VERIFY_ARE_EQUAL((UINT)3, vm.SupplementaryResults->Size);
            VERIFY_IS_TRUE((AddUnicodeLTRMarkers(L"1")) == vm.SupplementaryResults->GetAt(0)->Value);
            VERIFY_IS_TRUE(UNIT1 == vm.SupplementaryResults->GetAt(0)->Unit->GetModelUnit());
            VERIFY_IS_TRUE((AddUnicodeLTRMarkers(L"2")) == vm.SupplementaryResults->GetAt(1)->Value);
            VERIFY_IS_TRUE(UNIT2 == vm.SupplementaryResults->GetAt(1)->Unit->GetModelUnit());
            VERIFY_IS_TRUE((AddUnicodeLTRMarkers(L"3")) == vm.SupplementaryResults->GetAt(2)->Value);
            VERIFY_IS_TRUE(UNIT3 == vm.SupplementaryResults->GetAt(2)->Unit->GetModelUnit());
        }

        // Test that changing category immediately updates supplementary results
        TEST_METHOD(TestCategoryChangeImmediatelyUpdatesSupplementaryResults)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vector<tuple<wstring, UCM::Unit>> supp;
            supp.push_back(tuple<wstring, UCM::Unit>(L"1", UNIT1));
            supp.push_back(tuple<wstring, UCM::Unit>(L"2", UNIT2));
            supp.push_back(tuple<wstring, UCM::Unit>(L"3", UNIT3));
            vm.UpdateSupplementaryResults(supp);
            WaitForSingleObjectEx(GetCurrentThread(), 1100, FALSE);
            VERIFY_ARE_EQUAL((UINT)3, vm.SupplementaryResults->Size);   // Verify we're in the state we expect as a pre condition

            vm.CurrentCategory = vm.Categories->GetAt(2);
            VERIFY_ARE_EQUAL((UINT)0, vm.SupplementaryResults->Size);
        }

        // Test that changing category immediately updates supplementary results
        TEST_METHOD(TestCategoryChangeImmediatelyUpdatesSupplementaryResultsWhimsy)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vector<tuple<wstring, UCM::Unit>> supp;
            supp.push_back(tuple<wstring, UCM::Unit>(L"1", UNIT1));
            supp.push_back(tuple<wstring, UCM::Unit>(L"2", UNIT2));
            supp.push_back(tuple<wstring, UCM::Unit>(L"3", UNIT3));
            supp.push_back(tuple<wstring, UCM::Unit>(L"4", UNITWHIMSY));
            vm.UpdateSupplementaryResults(supp);
            WaitForSingleObjectEx(GetCurrentThread(), 1100, FALSE);
            VERIFY_ARE_EQUAL((UINT)4, vm.SupplementaryResults->Size);   // Verify we're in the state we expect as a pre condition

            VERIFY_IS_TRUE(vm.SupplementaryResults->GetAt(3)->Unit->GetModelUnit().isWhimsical);
            VERIFY_IS_FALSE(vm.SupplementaryResults->GetAt(0)->Unit->GetModelUnit().isWhimsical);
        }

        // Test that changing units immediately updates supplementary results
        TEST_METHOD(TestUnitChangeImmediatelyUpdatesSupplementaryResults)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vector<tuple<wstring, UCM::Unit>> supp;
            supp.push_back(tuple<wstring, UCM::Unit>(L"1", UNIT1));
            supp.push_back(tuple<wstring, UCM::Unit>(L"2", UNIT2));
            supp.push_back(tuple<wstring, UCM::Unit>(L"3", UNIT3));
            vm.UpdateSupplementaryResults(supp);
            WaitForSingleObjectEx(GetCurrentThread(), 1100, FALSE);
            VERIFY_ARE_EQUAL((UINT)3, vm.SupplementaryResults->Size);   // Verify we're in the state we expect as a pre condition

            vm.Unit1 = vm.Units->GetAt(2);
            VERIFY_ARE_EQUAL((UINT)0, vm.SupplementaryResults->Size);

            // Reset and try with other unit
            vm.UpdateSupplementaryResults(supp);
            WaitForSingleObjectEx(GetCurrentThread(), 1100, FALSE);
            VERIFY_ARE_EQUAL((UINT)3, vm.SupplementaryResults->Size);   // Verify we're in the state we expect as a pre condition

            vm.Unit2 = vm.Units->GetAt(0);
            VERIFY_ARE_EQUAL((UINT)0, vm.SupplementaryResults->Size);
        }

        // Test that only the first whimsical unit is selected and is appended
        // to end of supplementary results.
        TEST_METHOD(TestSupplementaryResultsWhimsicalUnits)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            UCM::Unit unit;
            unit.isWhimsical = false;

            UCM::Unit unitWhimSubsequent;
            unitWhimSubsequent.isWhimsical = true;

            vector<tuple<std::wstring, UCM::Unit>> suggestedList;
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", unit));
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", unit));
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", UNITWHIMSY));
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", unitWhimSubsequent));
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", unit));
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", unit));
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", unitWhimSubsequent));
            suggestedList.push_back(tuple<wstring, UCM::Unit>(L"", unit));

            vm.UpdateSupplementaryResults(suggestedList);
            WaitForSingleObjectEx(GetCurrentThread(), 1100, FALSE);
            VERIFY_ARE_EQUAL((UINT)6, vm.SupplementaryResults->Size);
            while (vm.SupplementaryResults->Size > 1)
            {
                VERIFY_IS_FALSE(vm.SupplementaryResults->GetAt(0)->IsWhimsical());
                vm.SupplementaryResults->RemoveAt(0);
            }
            // Last item
            VERIFY_IS_TRUE(vm.SupplementaryResults->GetAt(0)->Unit->GetModelUnit() == UNITWHIMSY);
        }

        // Test deserialization
        TEST_METHOD(TestUnitConverterViewModelDeserialization)
        {
            String ^ serializedTest = L"0[;;;]0[;;;]0[;;;]1[;;;]1.5[;;;]25[;;;]1.5[;;;]25[;;;][###][###]";
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vm.Deserialize(serializedTest);
            VERIFY_IS_TRUE(vm.Value1 == L"1.5");
            VERIFY_IS_TRUE(vm.Value2 == L"25");
            VERIFY_IS_TRUE(vm.GetValueFromUnlocalized() == L"1.5");
            VERIFY_IS_TRUE(vm.GetValueToUnlocalized() == L"25");
            VERIFY_ARE_EQUAL(vm.Value1Active, false);
            VERIFY_ARE_EQUAL(vm.Value2Active, true);
            VERIFY_IS_TRUE(mock->m_deSerializeCallCount == 1);
        }

        // Test serialization
        /*TEST_METHOD(TestUnitConverterViewModelSerialization)
        {
            String ^ serializedTest = L"0[;;;]0[;;;]0[;;;]1[;;;];;;]1.5[;;;[;;;]25[###[;;;]0[;;;]0[;;;][###][###]";
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vm.Value1 = L";;;]1.5[;;;";
            vm.Value2 = L"25[###";
            vm.Value1Active = false;
            vm.Value2Active = true;
            String ^ test = vm.Serialize();
            VERIFY_IS_TRUE(serializedTest == test);
            VERIFY_IS_TRUE(mock->m_serializeCallCount == 1);
        }*/

        TEST_METHOD(TestOnPaste)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            // Call count is being set to 1 because we send 'CE' command as the first call in OnPaste method of the ViewModel
            UINT callCount = 1;
            ViewMode mode = ViewMode::Volume; // Some temp mode for UnitConverter

            // Paste an invalid character - verify that call count doesn't increment
            vm.OnPaste("z", mode);
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);


            // Test all valid characters. Verify that two commands are sent for each character
            vm.OnPaste("0", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Zero == mock->m_lastCommand);

            vm.OnPaste("1", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::One == mock->m_lastCommand);

            vm.OnPaste("2", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Two == mock->m_lastCommand);

            vm.OnPaste("3", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Three == mock->m_lastCommand);

            vm.OnPaste("4", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Four == mock->m_lastCommand);

            vm.OnPaste("5", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Five == mock->m_lastCommand);

            vm.OnPaste("6", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Six == mock->m_lastCommand);

            vm.OnPaste("7", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Seven == mock->m_lastCommand);

            vm.OnPaste("8", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Eight == mock->m_lastCommand);

            vm.OnPaste("9", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Nine == mock->m_lastCommand);

            vm.OnPaste(".", mode);
            callCount += 2;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            VERIFY_IS_TRUE(UCM::Command::Decimal == mock->m_lastCommand);

            vm.OnPaste("-", mode);
            // Call count should increment by one (the Clear command) since negate isn't
            // sent by itself, only after another legal character
            ++callCount;
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);

            // Send an invalid character

            vm.OnPaste("a", mode);
            // Count should remain the same
            VERIFY_ARE_EQUAL(callCount, mock->m_sendCommandCallCount);
            // Last command should remain the same
            VERIFY_IS_TRUE(UCM::Command::Clear == mock->m_lastCommand);
        }

        TEST_METHOD(TestDecimalFormattingLogic)
        {
            // verify that a dangling decimal is left alone until the user switches active fields, and that trailing zeroes
            // entered by the user remain in the display even after a switch.

            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            const WCHAR * vFrom = L"3.", *vTo = L"2.50";
            vm.UpdateDisplay(vFrom, vTo);
            // Establish base condition
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(L"3."));
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(L"2.50"));
            vm.SwitchActive->Execute(nullptr);
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(L"3")); // dangling decimal now removed
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(L"2.50"));
            vm.SwitchActive->Execute(nullptr);
            VERIFY_IS_TRUE(vm.Value1 == AddUnicodeLTRMarkers(L"3"));
            VERIFY_IS_TRUE(vm.Value2 == AddUnicodeLTRMarkers(L"2.50"));
        }
        // Tests that when we switch the active field and get display
        // updates, the correct automation names are are being updated.
        TEST_METHOD(TestValue1AndValue2AutomationNameChanges)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);
            vm.Value1 = L"1";
            vm.Unit1 = vm.Units->GetAt(1);
            VERIFY_IS_TRUE(vm.Value1AutomationName == L"Convert from 1 UNIT5");
            VERIFY_IS_TRUE(vm.Value2AutomationName == L"Converts into 0 UNIT6");
            vm.Value2 = L"234";
            vm.Value2Active = true;
            VERIFY_IS_TRUE(vm.Value2AutomationName == L"Convert from 234 UNIT6");
            VERIFY_IS_TRUE(vm.Value1AutomationName == L"Converts into 1 UNIT5");
            vm.Value2 = L"3";
            vm.Unit2 = vm.Units->GetAt(0);
            VERIFY_IS_TRUE(vm.Value2AutomationName == L"Convert from 3 UNIT4");
            VERIFY_IS_TRUE(vm.Value1AutomationName == L"Converts into 1 UNIT5");
            vm.Value1Active = true;
            VERIFY_IS_TRUE(vm.Value1AutomationName == L"Convert from 1 UNIT5");
            VERIFY_IS_TRUE(vm.Value2AutomationName == L"Converts into 3 UNIT4");
        }

        // Test that an invalid model unit list results in a Units list of size 1
        // containing EMPTY_UNIT.
        TEST_METHOD(TestUnitsListBuildsFromEmptyModelUnitList)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vm.BuildUnitList({});

            VERIFY_ARE_EQUAL(1u, vm.Units->Size);
            VERIFY_ARE_EQUAL((UCM::EMPTY_UNIT).id, (vm.Units->GetAt(0)->GetModelUnit()).id);
        }

        // Test that a valid model unit list vuilds 
        TEST_METHOD(TestUnitsListBuildsFromValidModelUnitList)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vm.BuildUnitList({
                UNIT1,
                UNIT2,
                UNIT3
            });

            VERIFY_ARE_EQUAL(3u, vm.Units->Size);
            VERIFY_ARE_EQUAL(UNIT1.id, (vm.Units->GetAt(0)->GetModelUnit()).id);
            VERIFY_ARE_EQUAL(UNIT2.id, (vm.Units->GetAt(1)->GetModelUnit()).id);
            VERIFY_ARE_EQUAL(UNIT3.id, (vm.Units->GetAt(2)->GetModelUnit()).id);
        }

        TEST_METHOD(TestFindInListWhenListIsValid)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vm.BuildUnitList({
                UNIT1,
                UNIT2,
                UNIT3
            });

            Unit^ foundUnit = vm.FindUnitInList(UNIT1);
            VERIFY_ARE_EQUAL(UNIT1.id, foundUnit->GetModelUnit().id);
        }

        TEST_METHOD(TestFindInListWhenListIsInvalid)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vm.BuildUnitList({});

            Unit^ foundUnit = vm.FindUnitInList(UNIT1);

            VERIFY_ARE_EQUAL(UCM::EMPTY_UNIT.id, foundUnit->GetModelUnit().id);
        }

        TEST_METHOD(TestSetSelectedUnits)
        {
            shared_ptr<UnitConverterMock> mock = make_shared<UnitConverterMock>();
            VM::UnitConverterViewModel vm(mock);

            vm.CurrentCategory = vm.Categories->GetAt(0);

            vm.SetSelectedUnits();
            VERIFY_ARE_NOT_EQUAL(UCM::EMPTY_UNIT.id, vm.Unit1->GetModelUnit().id);
            VERIFY_ARE_NOT_EQUAL(UCM::EMPTY_UNIT.id, vm.Unit2->GetModelUnit().id);
        }
    };
}