Tests

feat: implement `Neg` for `AffinePoint` #1091

Job	Run time
no-std build	1m 34s
no-std build	1m 34s
Unix tests (ubuntu-latest, stable)	1m 46s
Unix tests (ubuntu-latest, stable)	1m 46s
Unix tests (ubuntu-latest, nightly)	1m 50s
Unix tests (ubuntu-latest, nightly)	1m 50s
Unix tests (macos-11, stable)	15m 1s
Unix tests (macos-11, stable)	6m 52s
Unix tests (macos-11, nightly)	4m 41s
Unix tests (macos-11, nightly)	4m 41s
WASM tests	3m 52s
WASM tests	3m 52s
Windows tests (stable, x86_64-pc-windows-gnu)	14m 1s
Windows tests (stable, x86_64-pc-windows-gnu)	14m 1s
Windows tests (stable, x86_64-pc-windows-msvc)	7m 55s
Windows tests (stable, x86_64-pc-windows-msvc)	7m 55s
Windows tests (nightly, x86_64-pc-windows-gnu)	15m 0s
Windows tests (nightly, x86_64-pc-windows-gnu)	10m 7s
Windows tests (nightly, x86_64-pc-windows-msvc)	14m 58s
Windows tests (nightly, x86_64-pc-windows-msvc)	3m 51s
	2h 17m 7s

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