test: improve test coverage for frames

[huster-zhangpeng]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 99.66887% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
qbase/src/frame/padding.rs	83.33%	1 Missing ⚠️

Files with missing lines	Coverage Δ
h3-shim/src/tests.rs	100.00% <100.00%> (ø)
qbase/src/frame/ack.rs	96.05% <100.00%> (+15.28%)	⬆️
qbase/src/frame/connection_close.rs	96.18% <100.00%> (+13.13%)	⬆️
qbase/src/frame/crypto.rs	96.33% <100.00%> (+11.18%)	⬆️
qbase/src/frame/data_blocked.rs	100.00% <100.00%> (+27.27%)	⬆️
qbase/src/frame/datagram.rs	100.00% <100.00%> (+5.26%)	⬆️
qbase/src/frame/error.rs	97.53% <100.00%> (+97.53%)	⬆️
qbase/src/frame/handshake_done.rs	96.66% <100.00%> (+12.66%)	⬆️
qbase/src/frame/max_data.rs	97.87% <100.00%> (+23.51%)	⬆️
qbase/src/frame/max_stream_data.rs	100.00% <100.00%> (+32.60%)	⬆️
... and 13 more

... and 5 files with indirect coverage changes