Silence clippy lint for test code #2778

Job	Run time
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	23s
check-docs	23s
cross-targets (x86_64-sun-solaris)	1m 20s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	20s
cross-tests (ubuntu-latest)	2m 16s
alternative_targets (ubuntu-latest, aarch64-linux-android)	21s
features_check (ubuntu-latest)	6m 9s
no_std (ubuntu-latest, thumbv6m-none-eabi)	16s
features_check (macos-latest)	12m 12s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	18s
rust_msrv (ubuntu-latest)	1m 27s
rust_versions (ubuntu-latest, stable)	1m 20s
features_check (windows-latest)	9m 32s
rust_versions (ubuntu-latest, beta)	1m 10s
test_wasi (ubuntu-latest, wasm32-wasi)	38s
rust_versions (ubuntu-latest, nightly)	1m 22s
test_wasm (ubuntu-latest)	31s
timezones (ubuntu-latest, ACST-9:30)	1m 37s
timezones (ubuntu-latest, EST4)	1m 35s
timezones (ubuntu-latest, UTC0)	1m 44s
timezones (ubuntu-latest, Asia/Katmandu)	1m 38s
timezones (macos-latest, ACST-9:30)	1m 14s
timezones (macos-latest, EST4)	1m 56s
timezones (macos-latest, UTC0)	1m 10s
timezones (macos-latest, Asia/Katmandu)	2m 2s
timezones (windows-latest, ACST-9:30)	1m 48s
timezones (windows-latest, EST4)	2m 18s
timezones (windows-latest, UTC0)	1m 44s
timezones (windows-latest, Asia/Katmandu)	2m 18s
	1h 1m 2s

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