eips: add missing unit test for `MIN_PROTOCOL_BASE_FEE` #4747

Job	Run time
docs	1m 4s
check no_std	51s
clippy	1m 24s
cfg-check	31s
doctest	2m 42s
feature-checks	7m 58s
fmt	13s
test ubuntu-latest stable --no-default-features	2m 17s
wasm-wasi	3m 18s
wasm-unknown	2m 11s
test ubuntu-latest stable	2m 21s
test ubuntu-latest stable --all-features	2m 47s
test ubuntu-latest nightly --no-default-features	1m 44s
test ubuntu-latest nightly	1m 42s
test ubuntu-latest nightly --all-features	2m 24s
test ubuntu-latest 1.79 --no-default-features	1m 36s
test ubuntu-latest 1.79	1m 43s
test windows-latest stable --no-default-features	5m 50s
test windows-latest stable	5m 36s
test windows-latest stable --all-features	6m 9s
test windows-latest nightly --no-default-features	3m 29s
test windows-latest nightly	3m 49s
test windows-latest nightly --all-features	4m 48s
test windows-latest 1.79 --no-default-features	3m 3s
test windows-latest 1.79	3m 51s
	1h 13m 21s

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