Tests

[mypyc] Preserve inherited attribute defaults under separate=True (#2… #22482

Job	Run time
Test mypyc suite with 32-bit Python	12m 0s
Test suite with py311-ubuntu	9m 51s
mypyc runtime tests with py310-ubuntu	7m 3s
Parallel tests with py314-ubuntu, interpreted	28m 2s
Test suite with py312-ubuntu	9m 57s
Test suite with py314t-ubuntu, mypyc-compiled	18m 33s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 13s
Test suite with py313-ubuntu, mypyc-compiled	16m 8s
Test suite with py310-ubuntu, mypyc-compiled	16m 55s
Formatting and code style with Black + ruff	2m 0s
Type check our own code (py310-windows-64)	2m 6s
Type check our own code (py310-ubuntu)	1m 16s
Test suite with py314-windows-64	33m 10s
mypyc runtime tests with py313-macos	5m 28s
Test suite with py314-ubuntu, mypyc-compiled	16m 19s
Test suite with py315-ubuntu, mypyc-compiled	16m 31s
Parallel tests with py314-windows-64, interpreted	12m 27s
	3h 57m 59s

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