Add 48 C++ MSTest tests for LightSwitch

.github/actions/spell-check/allow/names.txt

@@ -235,6 +235,7 @@ Skia
 Spotify
 taskmgr
 tldr
+Troms
 Vanara
 wangyi
 WEX

.github/actions/spell-check/expect.txt

@@ -2341,3 +2341,4 @@ YTimer
 zamora
 zonability
 Zorder
+Bluelight

PowerToys.slnx

@@ -707,6 +707,7 @@
       <Platform Solution="*|x64" Project="x64" />
       <Deploy />
     </Project>
+    <Project Path="src/modules/LightSwitch/UnitTests/UnitTests-LightSwitch.vcxproj" Id="b1a2c3d4-1111-2222-3333-444455556666" />
   </Folder>
   <Folder Name="/modules/PowerDisplay/">
     <Project Path="src/modules/powerdisplay/PowerDisplay.Models/PowerDisplay.Models.csproj">

src/modules/LightSwitch/LightSwitchService/LightSwitchSettings.h

@@ -13,66 +13,9 @@
 #include <common/SettingsAPI/settings_objects.h>
 #include <SettingsConstants.h>
 
-class SettingsObserver;
-
-enum class ScheduleMode
-{
-    Off,
-    FixedHours,
-    SunsetToSunrise,
-    FollowNightLight,
-    // Add more in the future
-};
-
-inline std::wstring ToString(ScheduleMode mode)
-{
-    switch (mode)
-    {
-    case ScheduleMode::FixedHours:
-        return L"FixedHours";
-    case ScheduleMode::SunsetToSunrise:
-        return L"SunsetToSunrise";
-    case ScheduleMode::FollowNightLight:
-        return L"FollowNightLight";
-    default:
-        return L"Off";
-    }
-}
-
-inline ScheduleMode FromString(const std::wstring& str)
-{
-    if (str == L"SunsetToSunrise")
-        return ScheduleMode::SunsetToSunrise;
-    if (str == L"FixedHours")
-        return ScheduleMode::FixedHours;
-    if (str == L"FollowNightLight")
-        return ScheduleMode::FollowNightLight;
-    else
-        return ScheduleMode::Off;
-}
-
-struct LightSwitchConfig
-{
-    ScheduleMode scheduleMode = ScheduleMode::FixedHours;
-
-    std::wstring latitude = L"0.0";
-    std::wstring longitude = L"0.0";
-
-    // Stored as minutes since midnight
-    int lightTime = 8 * 60; // 08:00 default
-    int darkTime = 20 * 60; // 20:00 default
+#include "../LightSwitchTypes.h"
 
-    int sunrise_offset = 0;
-    int sunset_offset = 0;
-
-    bool changeSystem = false;
-    bool changeApps = false;
-
-    bool enableDarkModeProfile = false;
-    bool enableLightModeProfile = false;
-    std::wstring darkModeProfile = L"";
-    std::wstring lightModeProfile = L"";
-};
+class SettingsObserver;
 
 class LightSwitchSettings
 {

src/modules/LightSwitch/LightSwitchService/LightSwitchStateManager.cpp

@@ -94,20 +94,7 @@ void LightSwitchStateManager::OnNightLightChange()
     EvaluateAndApplyIfNeeded();
 }
 
-// Helpers
-bool LightSwitchStateManager::CoordinatesAreValid(const std::wstring& lat, const std::wstring& lon)
-{
-    try
-    {
-        double latVal = std::stod(lat);
-        double lonVal = std::stod(lon);
-        return !(latVal == 0 && lonVal == 0) && (latVal >= -90.0 && latVal <= 90.0) && (lonVal >= -180.0 && lonVal <= 180.0);
-    }
-    catch (...)
-    {
-        return false;
-    }
-}
+// CoordinatesAreValid is now a free function in LightSwitchUtils.h
 
 void LightSwitchStateManager::SyncInitialThemeState()
 {

src/modules/LightSwitch/LightSwitchService/LightSwitchStateManager.h

@@ -47,7 +47,6 @@ class LightSwitchStateManager
     std::mutex _stateMutex;
 
     void EvaluateAndApplyIfNeeded();
-    bool CoordinatesAreValid(const std::wstring& lat, const std::wstring& lon);
 
     // Notify PowerDisplay module about theme change to apply display profiles
     void NotifyPowerDisplay(bool isLight);

src/modules/LightSwitch/LightSwitchService/LightSwitchUtils.h

@@ -1,5 +1,24 @@
 #pragma once
 #include <windows.h>
+#include <string>
+
+// Validates that lat/lon strings represent non-sentinel, in-range coordinates.
+// Rejects (0,0) as a sentinel for "not configured".
+inline bool CoordinatesAreValid(const std::wstring& lat, const std::wstring& lon)
+{
+    try
+    {
+        double latVal = std::stod(lat);
+        double lonVal = std::stod(lon);
+        return !(latVal == 0 && lonVal == 0) &&
+               (latVal >= -90.0 && latVal <= 90.0) &&
+               (lonVal >= -180.0 && lonVal <= 180.0);
+    }
+    catch (...)
+    {
+        return false;
+    }
+}
 
 constexpr bool ShouldBeLight(int nowMinutes, int lightTime, int darkTime)
 {

src/modules/LightSwitch/LightSwitchTypes.h

@@ -0,0 +1,68 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#pragma once
+
+#include <string>
+
+// Shared lightweight types for LightSwitch — no heavy dependencies.
+// Consumed by both the service (LightSwitchSettings.h) and unit tests.
+
+enum class ScheduleMode
+{
+    Off,
+    FixedHours,
+    SunsetToSunrise,
+    FollowNightLight,
+};
+
+inline std::wstring ToString(ScheduleMode mode)
+{
+    switch (mode)
+    {
+    case ScheduleMode::FixedHours:
+        return L"FixedHours";
+    case ScheduleMode::SunsetToSunrise:
+        return L"SunsetToSunrise";
+    case ScheduleMode::FollowNightLight:
+        return L"FollowNightLight";
+    default:
+        return L"Off";
+    }
+}
+
+inline ScheduleMode FromString(const std::wstring& str)
+{
+    if (str == L"SunsetToSunrise")
+        return ScheduleMode::SunsetToSunrise;
+    if (str == L"FixedHours")
+        return ScheduleMode::FixedHours;
+    if (str == L"FollowNightLight")
+        return ScheduleMode::FollowNightLight;
+    else
+        return ScheduleMode::Off;
+}
+
+struct LightSwitchConfig
+{
+    ScheduleMode scheduleMode = ScheduleMode::FixedHours;
+
+    std::wstring latitude = L"0.0";
+    std::wstring longitude = L"0.0";
+
+    // Stored as minutes since midnight
+    int lightTime = 8 * 60; // 08:00 default
+    int darkTime = 20 * 60; // 20:00 default
+
+    int sunrise_offset = 0;
+    int sunset_offset = 0;
+
+    bool changeSystem = false;
+    bool changeApps = false;
+
+    bool enableDarkModeProfile = false;
+    bool enableLightModeProfile = false;
+    std::wstring darkModeProfile = L"";
+    std::wstring lightModeProfile = L"";
+};