From ba263143f97cdb7f7cd978ca3fe0af791dd6287f Mon Sep 17 00:00:00 2001
From: Rudy Huyn <rudyhuyn@gmail.com>
Date: Thu, 7 Mar 2019 22:06:16 -0800
Subject: [PATCH] Add unit tests

---
 .../DateCalculatorUnitTests.cpp               | 61 ++++++++++++++++++-
 1 file changed, 60 insertions(+), 1 deletion(-)

diff --git a/src/CalculatorUnitTests/DateCalculatorUnitTests.cpp b/src/CalculatorUnitTests/DateCalculatorUnitTests.cpp
index 7371a26d..335b7b34 100644
--- a/src/CalculatorUnitTests/DateCalculatorUnitTests.cpp
+++ b/src/CalculatorUnitTests/DateCalculatorUnitTests.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 #include "pch.h"
@@ -387,6 +387,65 @@ namespace DateCalculationUnitTests
             VERIFY_IS_TRUE(StringReference(L"") != viewModel->StrDateResult);
         }
 
+        TEST_METHOD(DateCalcViewModelDateDiffDaylightSavingTimeTest)
+        {
+          auto viewModel = ref new DateCalculatorViewModel();
+
+          viewModel->IsDateDiffMode = true;
+          VERIFY_IS_TRUE(viewModel->IsDateDiffMode);
+
+          /*29.02.2008*/
+          viewModel->FromDate = DateUtils::SystemTimeToDateTime(datetimeDifftest[5].startDate);
+          /*31.03.2008*/
+          viewModel->ToDate = DateUtils::SystemTimeToDateTime(datetimeDifftest[5].endDate);
+
+          //// Assert for the result
+          VERIFY_IS_FALSE(viewModel->IsDiffInDays);
+          VERIFY_ARE_EQUAL(StringReference(L"31 days"), viewModel->StrDateDiffResultInDays);
+          VERIFY_ARE_EQUAL(StringReference(L"1 month, 2 days"), viewModel->StrDateDiffResult);
+
+          // Daylight saving time - Clock Forward
+          /*10.03.2019*/
+          SYSTEMTIME startDate;
+          startDate.wYear = 2019;
+          startDate.wMonth = 03;
+          startDate.wDay = 10;
+          startDate.wDayOfWeek = 0;
+          startDate.wHour = startDate.wMinute = 0;
+          startDate.wSecond = startDate.wMilliseconds = 0;
+          viewModel->FromDate = DateUtils::SystemTimeToDateTime(startDate);
+          /*11.03.2019*/
+          SYSTEMTIME endDate;
+          endDate.wYear = 2019;
+          endDate.wMonth = 03;
+          endDate.wDay = 11;
+          endDate.wDayOfWeek = 0;
+          endDate.wHour = endDate.wMinute = 0;
+          endDate.wSecond = endDate.wMilliseconds = 0;
+          viewModel->ToDate = DateUtils::SystemTimeToDateTime(endDate);
+          //// Assert for the result
+          VERIFY_IS_TRUE(viewModel->IsDiffInDays);
+          VERIFY_ARE_EQUAL(StringReference(L"1 day"), viewModel->StrDateDiffResult);
+
+          endDate.wDay += 6;
+          viewModel->ToDate = DateUtils::SystemTimeToDateTime(endDate);
+          //// Assert for the result
+          VERIFY_IS_FALSE(viewModel->IsDiffInDays);
+          VERIFY_ARE_EQUAL(StringReference(L"1 week"), viewModel->StrDateDiffResult);
+
+          // Daylight saving time - Clock Backward
+          /*03.11.2019*/
+          startDate.wMonth = 11;
+          startDate.wDay = 03;
+          viewModel->FromDate = DateUtils::SystemTimeToDateTime(startDate);
+          /*04.11.2019*/
+          endDate.wMonth = 11;
+          endDate.wDay = 04;
+          viewModel->ToDate = DateUtils::SystemTimeToDateTime(endDate);
+          VERIFY_IS_TRUE(viewModel->IsDiffInDays);
+          VERIFY_ARE_EQUAL(StringReference(L"1 day"), viewModel->StrDateDiffResult);
+        }
+
         TEST_METHOD(DateCalcViewModelAddTest)
         {
             // TODO - MSFT 10331900, fix this test