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Revisiting this project as it may help with [attribute] X [rendering op] matrix testing of Impeller. It's not an exhaustive combinatorial test of all combinations of rendering attributes, but it attempts each op with each attribute both default and non-default. For Impeller it only tests that the rendering produced output (i.e wasn't a NOP due to missing implementation), that the output changed if the given attribute was supposed to change the output, and that it rendered within the computed bounds that the rest of the engine will be assuming. These changes will not result in any automatic CI testing of Impeller as is since they are only run on the Metal backend which is not enabled by default. Running `out/host_[variant]/display_list_rendertests --enable-metal` manually on a Mac host, though, will run the tests through Impeller and there will be a lot of error output. Also, there is one known crash as reported in https://github.com/flutter/flutter/issues/135766