Added Unit Tests

run-tests.ps1

@@ -0,0 +1,33 @@
+# Run tests for SimpleWindowsNotifications
+
+# Set the configuration
+$Configuration = "Release"
+
+# Check if dotnet CLI is available
+$dotnetPath = Get-Command dotnet -ErrorAction SilentlyContinue | Select-Object -ExpandProperty Source
+if (-not $dotnetPath) {
+    Write-Host "The .NET SDK is not installed or not in the PATH. Please install the .NET SDK." -ForegroundColor Red
+    exit 1
+}
+
+# Build the solution
+Write-Host "Building solution..." -ForegroundColor Cyan
+dotnet build SimpleWindowsNotifications.sln --configuration $Configuration
+
+# Check if the build was successful
+if ($LASTEXITCODE -ne 0) {
+    Write-Host "Build failed with exit code $LASTEXITCODE" -ForegroundColor Red
+    exit $LASTEXITCODE
+}
+
+# Run the tests
+Write-Host "Running tests..." -ForegroundColor Cyan
+dotnet test SimpleWindowsNotifications.sln --configuration $Configuration --no-build
+
+# Check if the tests were successful
+if ($LASTEXITCODE -eq 0) {
+    Write-Host "All tests passed!" -ForegroundColor Green
+} else {
+    Write-Host "Tests failed with exit code $LASTEXITCODE" -ForegroundColor Red
+    exit $LASTEXITCODE
+}