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

tests/Paca.Tests/Core/VideoEnginesExtremeRedTests.cs

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+using System;
+using Paca.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class VideoEnginesExtremeRedTests
+{
+    private const string SampleInput = "C:\\Videos\\input.mp4";
+    private const string SampleOutput = "C:\\Videos\\output.mp4";
+
+    // ==========================================
+    // 1. VideoAspectAutoCropper
+    // ==========================================
+
+    [Fact]
+    public void VideoAspectAutoCropper_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        Assert.Throws<InvalidOperationException>(() =>
+            VideoAspectAutoCropper.BuildReframingCommandLine(SampleInput, SampleInput, ReframingMode.CenterCrop));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    [InlineData("", SampleOutput)]
+    [InlineData(SampleInput, "   ")]
+    public void VideoAspectAutoCropper_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        Assert.Throws<ArgumentException>(() =>
+            VideoAspectAutoCropper.BuildReframingCommandLine(inPath!, outPath!, ReframingMode.CenterCrop));
+    }
+
+    // ==========================================
+    // 2. VideoIntroOutroTrimmer
+    // ==========================================
+
+    [Fact]
+    public void VideoIntroOutroTrimmer_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        Assert.Throws<InvalidOperationException>(() =>
+            VideoIntroOutroTrimmer.BuildLosslessTrimCommandLine(SampleInput, SampleInput, 0, 10));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    public void VideoIntroOutroTrimmer_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        Assert.Throws<ArgumentException>(() =>
+            VideoIntroOutroTrimmer.BuildLosslessTrimCommandLine(inPath!, outPath!, 0, 10));
+    }
+
+    [Fact]
+    public void VideoIntroOutroTrimmer_BuildCommandLine_NegativeStartOrDuration_ClampsToSafeBounds()
+    {
+        var cmd = VideoIntroOutroTrimmer.BuildLosslessTrimCommandLine(SampleInput, SampleOutput, -10.5, -5.0);
+        Assert.NotNull(cmd);
+        Assert.Contains("-ss 0.00", cmd);
+        Assert.DoesNotContain("-t -", cmd);
+    }
+
+    // ==========================================
+    // 3. VideoPosterExtractor
+    // ==========================================
+
+    [Fact]
+    public void VideoPosterExtractor_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        var spec = new PosterExtractionSpec(5.0, 640, 360, PosterFormat.Jpeg);
+        Assert.Throws<InvalidOperationException>(() =>
+            VideoPosterExtractor.BuildPosterCommandLine(SampleInput, SampleInput, spec));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    public void VideoPosterExtractor_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        var spec = new PosterExtractionSpec(5.0, 640, 360, PosterFormat.Jpeg);
+        Assert.Throws<ArgumentException>(() =>
+            VideoPosterExtractor.BuildPosterCommandLine(inPath!, outPath!, spec));
+    }
+
+    // ==========================================
+    // 4. VideoSpriteSheetGenerator
+    // ==========================================
+
+    [Fact]
+    public void VideoSpriteSheetGenerator_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        var config = new SpriteSheetConfig(5, 5, 160, 90, 10);
+        Assert.Throws<InvalidOperationException>(() =>
+            VideoSpriteSheetGenerator.BuildFfmpegSpriteCommandLine(SampleInput, SampleInput, config));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    public void VideoSpriteSheetGenerator_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        var config = new SpriteSheetConfig(5, 5, 160, 90, 10);
+        Assert.Throws<ArgumentException>(() =>
+            VideoSpriteSheetGenerator.BuildFfmpegSpriteCommandLine(inPath!, outPath!, config));
+    }
+
+    // ==========================================
+    // 5. VideoFrameRateConverter
+    // ==========================================
+
+    [Fact]
+    public void VideoFrameRateConverter_BuildFfmpegArgs_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        Assert.Throws<InvalidOperationException>(() =>
+            VideoFrameRateConverter.BuildFfmpegArgs(SampleInput, SampleInput, 60, FrameRateConversionMode.Simple));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    public void VideoFrameRateConverter_BuildFfmpegArgs_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        Assert.Throws<ArgumentException>(() =>
+            VideoFrameRateConverter.BuildFfmpegArgs(inPath!, outPath!, 60, FrameRateConversionMode.Simple));
+    }
+
+    [Fact]
+    public void VideoFrameRateConverter_BuildFfmpegArgs_ExtremeFpsAndCrf_ClampedToValidRange()
+    {
+        var cmd = VideoFrameRateConverter.BuildFfmpegArgs(SampleInput, SampleOutput, 1000, FrameRateConversionMode.Simple, crf: 99);
+        Assert.NotNull(cmd);
+        Assert.Contains("fps=240", cmd);
+        Assert.Contains("-crf 51", cmd);
+    }
+
+    // ==========================================
+    // 6. VideoDenoiseEnhancer
+    // ==========================================
+
+    [Fact]
+    public void VideoDenoiseEnhancer_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
+    {
+        Assert.Throws<InvalidOperationException>(() =>
+            VideoDenoiseEnhancer.BuildDenoiseCommandLine(SampleInput, SampleInput, true, true));
+    }
+
+    [Theory]
+    [InlineData(null, SampleOutput)]
+    [InlineData(SampleInput, null)]
+    public void VideoDenoiseEnhancer_BuildCommandLine_NullOrWhitespace_ThrowsArgumentException(string? inPath, string? outPath)
+    {
+        Assert.Throws<ArgumentException>(() =>
+            VideoDenoiseEnhancer.BuildDenoiseCommandLine(inPath!, outPath!, true, true));
+    }
+
+    [Fact]
+    public void VideoEngines_PathsWithQuotes_EscapedOrStrippedSafely()
+    {
+        string maliciousIn = "C:\\test\\in\"jection.mp4";
+        string maliciousOut = "C:\\test\\out\"jection.mp4";
+
+        var cmd = VideoAspectAutoCropper.BuildReframingCommandLine(maliciousIn, maliciousOut, ReframingMode.CenterCrop);
+        Assert.NotNull(cmd);
+        Assert.DoesNotContain("in\"jection", cmd);
+        Assert.DoesNotContain("out\"jection", cmd);
+    }
+}