Tests

Prevent assignment to None for non-Optional class variables (#20054) #667

Job	Run time
Test mypyc suite with 32-bit Python	10m 48s
mypyc runtime tests with py310-ubuntu	6m 35s
Test suite with py310-ubuntu, mypyc-compiled	16m 25s
Test suite with py313-ubuntu, mypyc-compiled	15m 34s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 52s
Test suite with py314-windows-64	27m 21s
Test suite with py311-ubuntu	8m 58s
Parallel tests with py314-windows-64, interpreted	8m 46s
Test suite with py312-ubuntu	9m 14s
Parallel tests with py314-ubuntu, interpreted	24m 54s
mypyc runtime tests with py313-macos	6m 9s
Test suite with py314t-ubuntu, mypyc-compiled	17m 57s
Test suite with py314-ubuntu, mypyc-compiled	15m 27s
Formatting and code style with Black + ruff	1m 53s
Type check our own code (py310-windows-64)	1m 43s
Type check our own code (py310-ubuntu)	1m 11s
	3h 20m 47s

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