Tests

abstract and read only attributes #1921

Job	Run time
Test suite with py38-ubuntu, mypyc-compiled	24m 16s
Test suite with py38-windows-64	31m 22s
Test suite with py39-ubuntu	30m 47s
Test suite with py310-ubuntu	27m 28s
Test mypyc suite with 32-bit Python	7m 25s
Test suite with py311-ubuntu, mypyc-compiled	21m 0s
Test suite with py312-ubuntu, mypyc-compiled	23m 16s
Test suite with py313-ubuntu, mypyc-compiled	23m 36s
mypyc runtime tests with py39-macos	6m 28s
Type check our own code (py38-ubuntu)	4m 24s
Type check our own code (py38-windows-64)	4m 48s
Formatting and code style with Black + ruff	54s
	3h 25m 44s

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