Adding unit tests for skipped attributes #588

Job	Run time
audit	13s
style	41s
compile (stable, thumbv7em-none-eabihf)	1m 15s
documentation	45s
compile (1.65.0, thumbv7em-none-eabihf)	6m 15s
examples (mqtt)	57s
test (stable)	31s
examples (readback)	46s
test (stable, --all-features)	32s
test (stable, --no-default-features)	22s
test (stable, --no-default-features --features json-core)	29s
test (1.65.0)	34s
test (1.65.0, --all-features)	32s
test (1.65.0, --no-default-features)	31s
test (1.65.0, --no-default-features --features json-core)	32s
	14m 55s

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