test: improve test coverage for font styles #68

Job	Run time
cargo clippy (windows-2022, stable)	4m 15s
cargo build (windows-2022, stable)	1m 8s
cargo fmt (windows-2022, stable)	20s
cargo clippy (windows-2022, nightly)	1m 46s
cargo build (windows-2022, nightly)	1m 35s
cargo fmt (windows-2022, nightly)	24s
cargo clippy (macos-latest, stable)	1m 9s
cargo build (macos-latest, stable)	20s
cargo fmt (macos-latest, stable)	7s
cargo test (windows-2022, stable)	6m 28s
cargo build (macos-latest, nightly)	35s
cargo fmt (macos-latest, nightly)	13s
cargo test (windows-2022, nightly)	5m 58s
cargo build (ubuntu-22.04, stable)	12s
cargo fmt (ubuntu-22.04, stable)	3s
cargo clippy (macos-latest, nightly)	25s
cargo test (macos-latest, stable)	1m 24s
cargo build (ubuntu-22.04, nightly)	23s
cargo fmt (ubuntu-22.04, nightly)	14s
cargo clippy (ubuntu-22.04, stable)	1m 5s
cargo test (macos-latest, nightly)	3m 2s
cargo clippy (ubuntu-22.04, nightly)	25s
cargo test (ubuntu-22.04, stable)	2m 49s
cargo test (ubuntu-22.04, nightly)	1m 20s
Upload Test Event	0s
	35m 40s

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