From 71f8958a069208b08a4bcca207956ef8a15238ab Mon Sep 17 00:00:00 2001
From: Robert Schumacher <roschuma@microsoft.com>
Date: Fri, 1 Dec 2017 16:08:09 -0800
Subject: [PATCH] [vcpkg-contact-survey] Add monthly survey prompt

---
 toolsrc/include/pch.h                       |  1 +
 toolsrc/include/tests.pch.h                 |  1 +
 toolsrc/include/vcpkg/base/chrono.h         | 19 +++++
 toolsrc/include/vcpkg/globalstate.h         |  2 +
 toolsrc/include/vcpkg/userconfig.h          | 20 +++++
 toolsrc/src/tests.chrono.cpp                | 41 +++++++++
 toolsrc/src/vcpkg.cpp                       | 95 +++++++++------------
 toolsrc/src/vcpkg/base/chrono.cpp           | 62 ++++++++++++++
 toolsrc/src/vcpkg/commands.contact.cpp      | 13 +++
 toolsrc/src/vcpkg/globalstate.cpp           |  2 +
 toolsrc/src/vcpkg/metrics.cpp               | 28 ++----
 toolsrc/src/vcpkg/userconfig.cpp            | 83 ++++++++++++++++++
 toolsrc/vcpkglib/vcpkglib.vcxproj           |  2 +
 toolsrc/vcpkglib/vcpkglib.vcxproj.filters   |  6 ++
 toolsrc/vcpkgtest/vcpkgtest.vcxproj         |  1 +
 toolsrc/vcpkgtest/vcpkgtest.vcxproj.filters |  3 +
 16 files changed, 301 insertions(+), 78 deletions(-)
 create mode 100644 toolsrc/include/vcpkg/userconfig.h
 create mode 100644 toolsrc/src/tests.chrono.cpp
 create mode 100644 toolsrc/src/vcpkg/userconfig.cpp

diff --git a/toolsrc/include/pch.h b/toolsrc/include/pch.h
index 5c31fbbd1d6..683bef171b8 100644
--- a/toolsrc/include/pch.h
+++ b/toolsrc/include/pch.h
@@ -41,6 +41,7 @@
 #include <map>
 #include <memory>
 #include <mutex>
+#include <random>
 #include <regex>
 #include <set>
 #include <stdexcept>
diff --git a/toolsrc/include/tests.pch.h b/toolsrc/include/tests.pch.h
index 0037af585dc..5c00fca4aa0 100644
--- a/toolsrc/include/tests.pch.h
+++ b/toolsrc/include/tests.pch.h
@@ -2,6 +2,7 @@
 
 #include <CppUnitTest.h>
 
+#include <vcpkg/base/chrono.h>
 #include <vcpkg/base/sortedvector.h>
 #include <vcpkg/base/strings.h>
 #include <vcpkg/base/util.h>
diff --git a/toolsrc/include/vcpkg/base/chrono.h b/toolsrc/include/vcpkg/base/chrono.h
index c791f53fa1c..4291115f72a 100644
--- a/toolsrc/include/vcpkg/base/chrono.h
+++ b/toolsrc/include/vcpkg/base/chrono.h
@@ -2,6 +2,8 @@
 
 #include <chrono>
 #include <string>
+#include <time.h>
+#include <vcpkg/base/optional.h>
 
 namespace vcpkg::Chrono
 {
@@ -44,4 +46,21 @@ namespace vcpkg::Chrono
     private:
         std::chrono::high_resolution_clock::time_point m_start_tick;
     };
+
+    class CTime
+    {
+    public:
+        static Optional<CTime> get_current_date_time();
+        static Optional<CTime> parse(CStringView str);
+
+        constexpr CTime() : m_tm{0} {}
+        explicit constexpr CTime(tm t) : m_tm{t} {}
+
+        std::string to_string() const;
+
+        std::chrono::system_clock::time_point to_time_point() const;
+
+    private:
+        mutable tm m_tm;
+    };
 }
diff --git a/toolsrc/include/vcpkg/globalstate.h b/toolsrc/include/vcpkg/globalstate.h
index 40ec7958e88..360d3f43e07 100644
--- a/toolsrc/include/vcpkg/globalstate.h
+++ b/toolsrc/include/vcpkg/globalstate.h
@@ -10,6 +10,8 @@ namespace vcpkg
     struct GlobalState
     {
         static Util::LockGuarded<Chrono::ElapsedTimer> timer;
+        static Util::LockGuarded<std::string> g_surveydate;
+
         static std::atomic<bool> debugging;
         static std::atomic<bool> feature_packages;
 
diff --git a/toolsrc/include/vcpkg/userconfig.h b/toolsrc/include/vcpkg/userconfig.h
new file mode 100644
index 00000000000..63b8e54818f
--- /dev/null
+++ b/toolsrc/include/vcpkg/userconfig.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string>
+#include <vcpkg/base/files.h>
+
+namespace vcpkg
+{
+    struct UserConfig
+    {
+        std::string user_id;
+        std::string user_time;
+        std::string user_mac;
+
+        std::string last_completed_survey;
+
+        static UserConfig try_read_data(const Files::Filesystem& fs);
+
+        void try_write_data(Files::Filesystem& fs) const;
+    };
+}
diff --git a/toolsrc/src/tests.chrono.cpp b/toolsrc/src/tests.chrono.cpp
new file mode 100644
index 00000000000..269cdca5804
--- /dev/null
+++ b/toolsrc/src/tests.chrono.cpp
@@ -0,0 +1,41 @@
+#include "tests.pch.h"
+
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace Chrono = vcpkg::Chrono;
+
+namespace UnitTest1
+{
+    class ChronoTests : public TestClass<ChronoTests>
+    {
+        TEST_METHOD(parse_time)
+        {
+            auto timestring = "1990-02-03T04:05:06.0Z";
+            auto maybe_time = Chrono::CTime::parse(timestring);
+
+            Assert::IsTrue(maybe_time.has_value());
+
+            Assert::AreEqual(timestring, maybe_time.get()->to_string().c_str());
+        }
+
+        TEST_METHOD(parse_time_blank)
+        {
+            auto maybe_time = Chrono::CTime::parse("");
+
+            Assert::IsFalse(maybe_time.has_value());
+        }
+
+        TEST_METHOD(time_difference)
+        {
+            auto maybe_time1 = Chrono::CTime::parse("1990-02-03T04:05:06.0Z");
+            auto maybe_time2 = Chrono::CTime::parse("1990-02-10T04:05:06.0Z");
+
+            Assert::IsTrue(maybe_time1.has_value());
+            Assert::IsTrue(maybe_time2.has_value());
+
+            auto delta = maybe_time2.get()->to_time_point() - maybe_time1.get()->to_time_point();
+
+            Assert::AreEqual(24 * 7, std::chrono::duration_cast<std::chrono::hours>(delta).count());
+        }
+    };
+}
diff --git a/toolsrc/src/vcpkg.cpp b/toolsrc/src/vcpkg.cpp
index 04d44c414ba..094ea1dc5d1 100644
--- a/toolsrc/src/vcpkg.cpp
+++ b/toolsrc/src/vcpkg.cpp
@@ -20,11 +20,13 @@
 #include <vcpkg/input.h>
 #include <vcpkg/metrics.h>
 #include <vcpkg/paragraphs.h>
+#include <vcpkg/userconfig.h>
 #include <vcpkg/vcpkglib.h>
 
 #include <cassert>
 #include <fstream>
 #include <memory>
+#include <random>
 
 #pragma comment(lib, "ole32")
 #pragma comment(lib, "shell32")
@@ -110,6 +112,28 @@ static void inner(const VcpkgCmdArguments& args)
     if (args.command != "autocomplete")
     {
         Commands::Version::warn_if_vcpkg_version_mismatch(paths);
+        std::string surveydate = *GlobalState::g_surveydate.lock();
+        auto maybe_surveydate = Chrono::CTime::parse(surveydate);
+        if (auto p_surveydate = maybe_surveydate.get())
+        {
+            auto delta = std::chrono::system_clock::now() - p_surveydate->to_time_point();
+            // 24 hours/day * 30 days/month
+            if (std::chrono::duration_cast<std::chrono::hours>(delta).count() > 24 * 30)
+            {
+                std::default_random_engine generator(
+                    static_cast<unsigned int>(std::chrono::system_clock::now().time_since_epoch().count()));
+                std::uniform_int_distribution<int> distribution(1, 4);
+
+                if (distribution(generator) == 1)
+                {
+                    Metrics::g_metrics.lock()->track_property("surveyprompt", "true");
+                    System::println(
+                        System::Color::success,
+                        "Your feedback is important to improve Vcpkg! Please take 3 minutes to complete our survey "
+                        "by running: vcpkg contact --survey");
+                }
+            }
+        }
     }
 
     if (const auto command_function = find_command(Commands::get_available_commands_type_b()))
@@ -148,80 +172,41 @@ static void inner(const VcpkgCmdArguments& args)
 static void load_config()
 {
 #if defined(_WIN32)
-    fs::path localappdata;
-    {
-        // Config path in AppDataLocal
-        wchar_t* localappdatapath = nullptr;
-        if (S_OK != SHGetKnownFolderPath(FOLDERID_LocalAppData, 0, nullptr, &localappdatapath)) __fastfail(1);
-        localappdata = localappdatapath;
-        CoTaskMemFree(localappdatapath);
-    }
+    auto& fs = Files::get_real_filesystem();
 
-    std::string user_id, user_time, user_mac;
-    try
-    {
-        auto maybe_pghs = Paragraphs::get_paragraphs(Files::get_real_filesystem(), localappdata / "vcpkg" / "config");
-        if (const auto p_pghs = maybe_pghs.get())
-        {
-            const auto& pghs = *p_pghs;
-
-            std::unordered_map<std::string, std::string> keys;
-            if (pghs.size() > 0) keys = pghs[0];
-
-            for (size_t x = 1; x < pghs.size(); ++x)
-            {
-                for (auto&& p : pghs[x])
-                    keys.insert(p);
-            }
-
-            user_id = keys["User-Id"];
-            user_time = keys["User-Since"];
-            user_mac = keys["Mac-Hash"];
-        }
-    }
-    catch (...)
-    {
-    }
+    auto config = UserConfig::try_read_data(fs);
 
     bool write_config = false;
 
     // config file not found, could not be read, or invalid
-    if (user_id.empty() || user_time.empty())
+    if (config.user_id.empty() || config.user_time.empty())
     {
-        ::vcpkg::Metrics::Metrics::init_user_information(user_id, user_time);
+        ::vcpkg::Metrics::Metrics::init_user_information(config.user_id, config.user_time);
         write_config = true;
     }
 
-    if (user_mac.empty())
+    if (config.user_mac.empty())
     {
-        user_mac = Metrics::get_MAC_user();
+        config.user_mac = Metrics::get_MAC_user();
         write_config = true;
     }
 
     {
         auto locked_metrics = Metrics::g_metrics.lock();
-        locked_metrics->set_user_information(user_id, user_time);
-        locked_metrics->track_property("user_mac", user_mac);
+        locked_metrics->set_user_information(config.user_id, config.user_time);
+        locked_metrics->track_property("user_mac", config.user_mac);
     }
 
+    if (config.last_completed_survey.empty())
+    {
+        config.last_completed_survey = config.user_time;
+    }
+
+    GlobalState::g_surveydate.lock()->assign(config.last_completed_survey);
+
     if (write_config)
     {
-        try
-        {
-            std::error_code ec;
-            auto& fs = Files::get_real_filesystem();
-            fs.create_directory(localappdata / "vcpkg", ec);
-            fs.write_contents(localappdata / "vcpkg" / "config",
-                              Strings::format("User-Id: %s\n"
-                                              "User-Since: %s\n"
-                                              "Mac-Hash: %s\n",
-                                              user_id,
-                                              user_time,
-                                              user_mac));
-        }
-        catch (...)
-        {
-        }
+        config.try_write_data(fs);
     }
 #endif
 }
diff --git a/toolsrc/src/vcpkg/base/chrono.cpp b/toolsrc/src/vcpkg/base/chrono.cpp
index f0e45023128..03c1ecce942 100644
--- a/toolsrc/src/vcpkg/base/chrono.cpp
+++ b/toolsrc/src/vcpkg/base/chrono.cpp
@@ -60,4 +60,66 @@ namespace vcpkg::Chrono
     std::string ElapsedTime::to_string() const { return format_time_userfriendly(as<std::chrono::nanoseconds>()); }
 
     std::string ElapsedTimer::to_string() const { return elapsed().to_string(); }
+
+    Optional<CTime> CTime::get_current_date_time()
+    {
+        CTime ret;
+
+#if defined(_WIN32)
+        struct _timeb timebuffer;
+
+        _ftime_s(&timebuffer);
+
+        const errno_t err = gmtime_s(&ret.m_tm, &timebuffer.time);
+
+        if (err)
+        {
+            return nullopt;
+        }
+#else
+        time_t now = {0};
+        time(&now);
+        auto null_if_failed = gmtime_r(&now, &ret.m_tm);
+        if (null_if_failed == nullptr)
+        {
+            return nullopt;
+        }
+#endif
+
+        return ret;
+    }
+
+    Optional<CTime> CTime::parse(CStringView str)
+    {
+        CTime ret;
+        auto assigned = sscanf_s(str.c_str(),
+                                 "%d-%d-%dT%d:%d:%d.",
+                                 &ret.m_tm.tm_year,
+                                 &ret.m_tm.tm_mon,
+                                 &ret.m_tm.tm_mday,
+                                 &ret.m_tm.tm_hour,
+                                 &ret.m_tm.tm_min,
+                                 &ret.m_tm.tm_sec);
+        if (assigned != 6) return nullopt;
+        if (ret.m_tm.tm_year < 1900) return nullopt;
+        ret.m_tm.tm_year -= 1900;
+        if (ret.m_tm.tm_mon < 1) return nullopt;
+        ret.m_tm.tm_mon -= 1;
+        mktime(&ret.m_tm);
+        return ret;
+    }
+
+    std::string CTime::to_string() const
+    {
+        std::array<char, 80> date;
+        date.fill(0);
+
+        strftime(&date[0], date.size(), "%Y-%m-%dT%H:%M:%S.0Z", &m_tm);
+        return &date[0];
+    }
+    std::chrono::system_clock::time_point CTime::to_time_point() const
+    {
+        auto t = mktime(&m_tm);
+        return std::chrono::system_clock::from_time_t(t);
+    }
 }
diff --git a/toolsrc/src/vcpkg/commands.contact.cpp b/toolsrc/src/vcpkg/commands.contact.cpp
index 07dcea80ef9..8063fe31733 100644
--- a/toolsrc/src/vcpkg/commands.contact.cpp
+++ b/toolsrc/src/vcpkg/commands.contact.cpp
@@ -1,8 +1,10 @@
 #include "pch.h"
 
+#include <vcpkg/base/chrono.h>
 #include <vcpkg/base/system.h>
 #include <vcpkg/commands.h>
 #include <vcpkg/help.h>
+#include <vcpkg/userconfig.h>
 
 namespace vcpkg::Commands::Contact
 {
@@ -28,6 +30,17 @@ namespace vcpkg::Commands::Contact
 
         if (Util::Sets::contains(parsed_args.switches, switches[0].name))
         {
+#if defined(_WIN32)
+            auto maybe_now = Chrono::CTime::get_current_date_time();
+            if (auto p_now = maybe_now.get())
+            {
+                auto& fs = Files::get_real_filesystem();
+                auto config = UserConfig::try_read_data(fs);
+                config.last_completed_survey = p_now->to_string();
+                config.try_write_data(fs);
+            }
+#endif
+
             System::cmd_execute("start https://aka.ms/NPS_vcpkg");
             System::println("Default browser launched to https://aka.ms/NPS_vcpkg, thank you for your feedback!");
         }
diff --git a/toolsrc/src/vcpkg/globalstate.cpp b/toolsrc/src/vcpkg/globalstate.cpp
index 149401b2c14..123c77d46ad 100644
--- a/toolsrc/src/vcpkg/globalstate.cpp
+++ b/toolsrc/src/vcpkg/globalstate.cpp
@@ -5,6 +5,8 @@
 namespace vcpkg
 {
     Util::LockGuarded<Chrono::ElapsedTimer> GlobalState::timer;
+    Util::LockGuarded<std::string> GlobalState::g_surveydate;
+
     std::atomic<bool> GlobalState::debugging(false);
     std::atomic<bool> GlobalState::feature_packages(false);
 
diff --git a/toolsrc/src/vcpkg/metrics.cpp b/toolsrc/src/vcpkg/metrics.cpp
index 69160705cf8..a0d40e7d306 100644
--- a/toolsrc/src/vcpkg/metrics.cpp
+++ b/toolsrc/src/vcpkg/metrics.cpp
@@ -2,6 +2,7 @@
 
 #include <vcpkg/metrics.h>
 
+#include <vcpkg/base/chrono.h>
 #include <vcpkg/base/files.h>
 #include <vcpkg/base/strings.h>
 #include <vcpkg/base/system.h>
@@ -15,32 +16,13 @@ namespace vcpkg::Metrics
 
     static std::string get_current_date_time()
     {
-        struct tm newtime;
-        std::array<char, 80> date;
-        date.fill(0);
-
-#if defined(_WIN32)
-        struct _timeb timebuffer;
-
-        _ftime_s(&timebuffer);
-        time_t now = timebuffer.time;
-        const int milli = timebuffer.millitm;
-
-        const errno_t err = gmtime_s(&newtime, &now);
-
-        if (err)
+        auto maybe_time = Chrono::CTime::get_current_date_time();
+        if (auto ptime = maybe_time.get())
         {
-            return "";
+            return ptime->to_string();
         }
-#else
-        time_t now;
-        time(&now);
-        gmtime_r(&now, &newtime);
-        const int milli = 0;
-#endif
 
-        strftime(&date[0], date.size(), "%Y-%m-%dT%H:%M:%S", &newtime);
-        return std::string(&date[0]) + "." + std::to_string(milli) + "Z";
+        return "";
     }
 
     static std::string generate_random_UUID()
diff --git a/toolsrc/src/vcpkg/userconfig.cpp b/toolsrc/src/vcpkg/userconfig.cpp
new file mode 100644
index 00000000000..d13a46f4137
--- /dev/null
+++ b/toolsrc/src/vcpkg/userconfig.cpp
@@ -0,0 +1,83 @@
+#include "pch.h"
+
+#include <vcpkg/base/files.h>
+#include <vcpkg/base/lazy.h>
+#include <vcpkg/paragraphs.h>
+#include <vcpkg/userconfig.h>
+
+namespace
+{
+    static vcpkg::Lazy<fs::path> s_localappdata;
+
+    static const fs::path& get_localappdata()
+    {
+        return s_localappdata.get_lazy([]() {
+            fs::path localappdata;
+            {
+                // Config path in AppDataLocal
+                wchar_t* localappdatapath = nullptr;
+                if (S_OK != SHGetKnownFolderPath(FOLDERID_LocalAppData, 0, nullptr, &localappdatapath)) __fastfail(1);
+                localappdata = localappdatapath;
+                CoTaskMemFree(localappdatapath);
+            }
+            return localappdata;
+        });
+    }
+}
+
+namespace vcpkg
+{
+    UserConfig UserConfig::try_read_data(const Files::Filesystem& fs)
+    {
+        UserConfig ret;
+
+        try
+        {
+            auto maybe_pghs = Paragraphs::get_paragraphs(fs, get_localappdata() / "vcpkg" / "config");
+            if (const auto p_pghs = maybe_pghs.get())
+            {
+                const auto& pghs = *p_pghs;
+
+                std::unordered_map<std::string, std::string> keys;
+                if (pghs.size() > 0) keys = pghs[0];
+
+                for (size_t x = 1; x < pghs.size(); ++x)
+                {
+                    for (auto&& p : pghs[x])
+                        keys.insert(p);
+                }
+
+                ret.user_id = keys["User-Id"];
+                ret.user_time = keys["User-Since"];
+                ret.user_mac = keys["Mac-Hash"];
+                ret.last_completed_survey = keys["Survey-Completed"];
+            }
+        }
+        catch (...)
+        {
+        }
+
+        return ret;
+    }
+
+    void UserConfig::try_write_data(Files::Filesystem& fs) const
+    {
+        try
+        {
+            std::error_code ec;
+            fs.create_directory(get_localappdata() / "vcpkg", ec);
+            fs.write_contents(get_localappdata() / "vcpkg" / "config",
+                              Strings::format("User-Id: %s\n"
+                                              "User-Since: %s\n"
+                                              "Mac-Hash: %s\n"
+                                              "Survey-Completed: %s\n",
+                                              user_id,
+                                              user_time,
+                                              user_mac,
+                                              last_completed_survey));
+        }
+        catch (...)
+        {
+        }
+    }
+}
diff --git a/toolsrc/vcpkglib/vcpkglib.vcxproj b/toolsrc/vcpkglib/vcpkglib.vcxproj
index ae332e01565..9a7ad6dc0ae 100644
--- a/toolsrc/vcpkglib/vcpkglib.vcxproj
+++ b/toolsrc/vcpkglib/vcpkglib.vcxproj
@@ -178,6 +178,7 @@
     <ClInclude Include="..\include\vcpkg\statusparagraphs.h" />
     <ClInclude Include="..\include\vcpkg\triplet.h" />
     <ClInclude Include="..\include\vcpkg\update.h" />
+    <ClInclude Include="..\include\vcpkg\userconfig.h" />
     <ClInclude Include="..\include\vcpkg\vcpkgcmdarguments.h" />
     <ClInclude Include="..\include\vcpkg\vcpkglib.h" />
     <ClInclude Include="..\include\vcpkg\vcpkgpaths.h" />
@@ -240,6 +241,7 @@
     <ClCompile Include="..\src\vcpkg\statusparagraphs.cpp" />
     <ClCompile Include="..\src\vcpkg\triplet.cpp" />
     <ClCompile Include="..\src\vcpkg\update.cpp" />
+    <ClCompile Include="..\src\vcpkg\userconfig.cpp" />
     <ClCompile Include="..\src\vcpkg\vcpkgcmdarguments.cpp" />
     <ClCompile Include="..\src\vcpkg\vcpkglib.cpp" />
     <ClCompile Include="..\src\vcpkg\vcpkgpaths.cpp" />
diff --git a/toolsrc/vcpkglib/vcpkglib.vcxproj.filters b/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
index e902bffbbf4..966fc7fb952 100644
--- a/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
+++ b/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
@@ -192,6 +192,9 @@
     <ClCompile Include="..\src\vcpkg\base\system.cpp">
       <Filter>Source Files\vcpkg\base</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\vcpkg\userconfig.cpp">
+      <Filter>Source Files\vcpkg</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\include\pch.h">
@@ -332,5 +335,8 @@
     <ClInclude Include="..\include\vcpkg\export.ifw.h">
       <Filter>Header Files\vcpkg</Filter>
     </ClInclude>
+    <ClInclude Include="..\include\vcpkg\userconfig.h">
+      <Filter>Header Files\vcpkg</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/toolsrc/vcpkgtest/vcpkgtest.vcxproj b/toolsrc/vcpkgtest/vcpkgtest.vcxproj
index 9eafc1adad0..166216c4520 100644
--- a/toolsrc/vcpkgtest/vcpkgtest.vcxproj
+++ b/toolsrc/vcpkgtest/vcpkgtest.vcxproj
@@ -20,6 +20,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\src\tests.arguments.cpp" />
+    <ClCompile Include="..\src\tests.chrono.cpp" />
     <ClCompile Include="..\src\tests.dependencies.cpp" />
     <ClCompile Include="..\src\tests.packagespec.cpp" />
     <ClCompile Include="..\src\tests.paragraph.cpp" />
diff --git a/toolsrc/vcpkgtest/vcpkgtest.vcxproj.filters b/toolsrc/vcpkgtest/vcpkgtest.vcxproj.filters
index 2121f97824c..422f9298e98 100644
--- a/toolsrc/vcpkgtest/vcpkgtest.vcxproj.filters
+++ b/toolsrc/vcpkgtest/vcpkgtest.vcxproj.filters
@@ -42,6 +42,9 @@
     <ClCompile Include="..\src\tests.utils.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\tests.chrono.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\include\tests.pch.h">