Update `renderer_tests.cc` to use ImageComparisonTestFixture

jwmcglynn / donner

Donner SVG, a modern C++20 SVG rendering library supporting the latest SVG2 and CSS3 standards

https://jwmcglynn.github.io/donner/

ISC License

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Open jwmcglynn opened 5 months ago

jwmcglynn commented 5 months ago

Update test fixture to support UPDATE_GOLDEN_IMAGES_DIR (but make it configurable, we only want to use it on this one test)
Make the Renderer tests default to exact match (0 mismatched pixels), with ImageComparisonParams::Exact()