feat(spy): warn if mock used with a missing attribute #862

Job	Run time
Lint and type checks	40s
Test Python 3.7 on Ubuntu	23s
Test Python 3.8 on Ubuntu	30s
Test Python 3.9 on Ubuntu	22s
Test Python 3.10 on Ubuntu	57s
Test Python 3.11 on Ubuntu	26s
Test Python 3.12 on Ubuntu	2m 11s
Test Python 3.7 on Windows	48s
Test Python 3.8 on Windows	1m 13s
Test Python 3.9 on Windows	1m 6s
Test Python 3.10 on Windows	1m 15s
Test Python 3.11 on Windows	49s
Test Python 3.12 on Windows	6m 47s
Test Python 3.7 on macOS	50s
Test Python 3.8 on macOS	44s
Test Python 3.9 on macOS	1m 52s
Test Python 3.10 on macOS	48s
Test Python 3.11 on macOS	1m 23s
Test Python 3.12 on macOS	4m 2s
Build assets and deploy on tags	15s
	27m 21s

Provide feedback