test: add tests for rack 2.0 #152

Job	Run time
test-with-rack-2 (3.2, ubuntu-latest)	31s
test-with-active-support (2.7, ubuntu-latest)	33s
test-with-rack-2 (3.2, windows-latest)	4m 19s
test (2.7, ubuntu-latest)	44s
test-with-rack-2 (3.2, macos-latest)	1m 4s
test-with-active-support (2.7, windows-latest)	3m 54s
test (2.7, windows-latest)	3m 12s
test-with-active-support (2.7, macos-latest)	54s
test (2.7, macos-latest)	1m 19s
test-with-active-support (3.0, ubuntu-latest)	22s
test (3.0, ubuntu-latest)	29s
test-with-active-support (3.0, windows-latest)	2m 0s
test (3.0, windows-latest)	2m 32s
test-with-active-support (3.0, macos-latest)	26s
test (3.0, macos-latest)	48s
test-with-active-support (3.1, ubuntu-latest)	27s
test (3.1, ubuntu-latest)	29s
test-with-active-support (3.1, windows-latest)	2m 39s
test (3.1, windows-latest)	2m 37s
test-with-active-support (3.1, macos-latest)	42s
test (3.1, macos-latest)	51s
test-with-active-support (3.2, ubuntu-latest)	21s
test (3.2, ubuntu-latest)	34s
test-with-active-support (3.2, windows-latest)	4m 6s
test (3.2, windows-latest)	3m 20s
test-with-active-support (3.2, macos-latest)	38s
test (3.2, macos-latest)	44s
	40m 35s

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