Add tests for ToHarfBuzzBlob disposal behavior (#3466)

[Copilot]

Description of Change

Add test coverage for PR #3466's behavioral change where ToHarfBuzzBlob no longer disposes the SKStreamAsset parameter.

Tests Added (6 methods in SKShaperTest.cs)

• ToHarfBuzzBlobDoesNotDisposeStream - Stream remains accessible after blob creation
• ToHarfBuzzBlobStreamMustBeDisposedByCaller - Validates caller disposal responsibility
• ToHarfBuzzBlobBlobCanBeUsedWithinStreamLifetime - Safe usage pattern: using (stream) using (blob)
• ToHarfBuzzBlobWorksWithNonMemoryMappedStream - Memory copy fallback path (when GetMemoryBase() returns zero)
• SKShaperConstructorSucceeds - Integration test for SKShaper with new behavior
• ToHarfBuzzBlobCanCreateMultipleBlobsFromSameStream - Stream reusability validation

Test Expectations

Current code (before #3466): Tests fail - blob incorrectly disposes stream via destroy callback
After #3466 merge: Tests pass - caller manages stream lifecycle

Bugs Fixed

None. (Test-only PR supporting #3466)

API Changes

None.

Behavioral Changes

None.

Required skia PR

None.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 0t3vsblobprodcus362.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• 1k9vsblobprodcus379.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• 1s1vsblobprodcus386.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• 4myvsblobprodcus32.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• 4vyvsblobprodcus361.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• 7devsblobprodcus323.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• 7k6vsblobprodcus337.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• c50vsblobprodcus330.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• c78vsblobprodcus322.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• cflvsblobprodcus383.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• frdvsblobprodcus327.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• jd4vsblobprodcus366.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• kh4vsblobprodcus325.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• l49vsblobprodcus358.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• l7avsblobprodcus319.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet tool restore (dns block)
• lylvsblobprodcus31.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• m6xvsblobprodcus342.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• pc2vsblobprodcus360.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• rcxvsblobprodcus328.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• u3hvsblobprodcus371.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• u6ovsblobprodcus377.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• uy6vsblobprodcus34.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)
• yluvsblobprodcus367.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build tests/SkiaSharp.Tests.Console/SkiaSharp.Tests.Console.csproj (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

please look at #3466 and write some tests for this change.

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