add more tests #14

Job	Run time
Override test	3s
Default test	17s
Install test for Rust nightly on Linux	10s
Install test for Rust beta on Linux	10s
Install test for Rust stable on Linux	6s
Install test for Rust 1.62.0 on Linux	10s
Install test for Rust stable 18 months ago on Linux	13s
Install test for Rust stable minus 8 releases on Linux	13s
Install test for Rust nightly on macOS	19s
Install test for Rust beta on macOS	20s
Install test for Rust stable on macOS	8s
Install test for Rust 1.62.0 on macOS	27s
Install test for Rust stable 18 months ago on macOS	1m 2s
Install test for Rust stable minus 8 releases on macOS	17s
Install test for Rust nightly on Windows	33s
Install test for Rust beta on Windows	32s
Install test for Rust stable on Windows	33s
Install test for Rust 1.62.0 on Windows	23s
Install test for Rust stable 18 months ago on Windows	26s
Install test for Rust stable minus 8 releases on Windows	27s
Install test for Rust 1.0.0 on Linux	10s
	6m 59s

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