test(core/browser/platform): 26 extreme RED/GREEN TDD cycles and full regression hardening (3,235 PASS)

tests/Paca.Tests/Core/SpeedAndBitrateScheduleExtremeRedTests.cs

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+using System;
+using System.Collections.Generic;
+using Paca.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class SpeedAndBitrateScheduleExtremeRedTests
+{
+    private const string SampleInput = "C:\\Media\\input.mp4";
+    private const string SampleOutput = "C:\\Media\\output.mp4";
+
+    // ==========================================
+    // 1. MediaPlaybackSpeedPitchEngine
+    // ==========================================
+
+    [Fact]
+    public void MediaPlaybackSpeedPitchEngine_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        Assert.Throws<InvalidOperationException>(() =>
+            MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(SampleInput, SampleInput, 1.5));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    [InlineData("", SampleOutput)]
+    [InlineData(SampleInput, "   ")]
+    public void MediaPlaybackSpeedPitchEngine_BuildCommandLine_NullOrWhitespacePaths_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        Assert.Throws<ArgumentException>(() =>
+            MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(inPath!, outPath!, 1.5));
+    }
+
+    [Fact]
+    public void MediaPlaybackSpeedPitchEngine_BuildCommandLine_PathsWithQuotes_EscapedOrStripped()
+    {
+        string maliciousIn = "C:\\Media\\in\"put.mp4";
+        string maliciousOut = "C:\\Media\\out\"put.mp4";
+
+        var cmd = MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(maliciousIn, maliciousOut, 2.0);
+        Assert.NotNull(cmd);
+        Assert.DoesNotContain("in\"put", cmd);
+        Assert.DoesNotContain("out\"put", cmd);
+    }
+
+    // ==========================================
+    // 2. MediaBitrateEstimator
+    // ==========================================
+
+    [Fact]
+    public void MediaBitrateEstimator_BuildTwoPassCommands_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        var plan = new BitrateEstimationResult(true, 2500, 128, 50_000_000);
+        Assert.Throws<InvalidOperationException>(() =>
+            MediaBitrateEstimator.BuildTwoPassCommands(SampleInput, SampleInput, plan));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    [InlineData("", SampleOutput)]
+    [InlineData(SampleInput, "   ")]
+    public void MediaBitrateEstimator_BuildTwoPassCommands_NullOrWhitespacePaths_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        var plan = new BitrateEstimationResult(true, 2500, 128, 50_000_000);
+        Assert.Throws<ArgumentException>(() =>
+            MediaBitrateEstimator.BuildTwoPassCommands(inPath!, outPath!, plan));
+    }
+
+    [Fact]
+    public void MediaBitrateEstimator_BuildTwoPassCommands_PathsWithQuotes_EscapedOrStripped()
+    {
+        var plan = new BitrateEstimationResult(true, 2500, 128, 50_000_000);
+        string maliciousIn = "C:\\Media\\in\"put.mp4";
+        string maliciousOut = "C:\\Media\\out\"put.mp4";
+
+        var (p1, p2) = MediaBitrateEstimator.BuildTwoPassCommands(maliciousIn, maliciousOut, plan);
+        Assert.NotNull(p1);
+        Assert.NotNull(p2);
+        Assert.DoesNotContain("in\"put", p1);
+        Assert.DoesNotContain("out\"put", p2);
+    }
+
+    [Theory]
+    [InlineData(0)]
+    [InlineData(-1024)]
+    public void MediaBitrateEstimator_CalculateBitrate_ZeroOrNegativeTarget_ReturnsNotPossible(long badTarget)
+    {
+        var result = MediaBitrateEstimator.CalculateBitrate(60.0, badTarget);
+        Assert.NotNull(result);
+        Assert.False(result.IsPossible);
+    }
+
+    // ==========================================
+    // 3. BandwidthScheduleProfileEngine
+    // ==========================================
+
+    [Fact]
+    public void BandwidthScheduleProfileEngine_GetActiveProfile_NullConfig_ReturnsSafeDefault()
+    {
+        var profile = BandwidthScheduleProfileEngine.GetActiveProfile(DateTime.UtcNow, null!);
+        Assert.NotNull(profile);
+        Assert.Equal("Default", profile.ProfileName);
+    }
+
+    [Fact]
+    public void BandwidthScheduleProfileEngine_GetActiveProfile_ConfigWithNullRules_SkipsNullRulesSafely()
+    {
+        var config = new BandwidthScheduleConfig
+        {
+            IsEnabled = true,
+            DefaultProfile = new BandwidthProfile("Default", 0, 4),
+            Rules = new List<BandwidthTimeRule>
+            {
+                null!,
+                new(TimeSpan.FromHours(1), TimeSpan.FromHours(2), null!)
+            }
+        };
+
+        var ex = Record.Exception(() => BandwidthScheduleProfileEngine.GetActiveProfile(DateTime.UtcNow, config));
+        Assert.Null(ex);
+    }
+
+    // ==========================================
+    // 4. HlsManifestValidator
+    // ==========================================
+
+    [Fact]
+    public void HlsManifestValidator_Analyze_NullManifest_ReturnsSafeEmptyResult()
+    {
+        var result = HlsManifestValidator.Analyze(null!);
+        Assert.NotNull(result);
+        Assert.False(result.IsMasterPlaylist);
+        Assert.Equal(0, result.SegmentCount);
+    }
+
+    [Fact]
+    public void HlsManifestValidator_StripAdBlocks_NullManifest_ReturnsEmptyString()
+    {
+        var stripped = HlsManifestValidator.StripAdBlocks(null!);
+        Assert.NotNull(stripped);
+    }
+}