Minor improvement to test coverage of CSS transition polyfill

[necolas]

No description provided.

[github-actions]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.

Results	Base	Patch	Ratio
react-strict-dom/dist/dom/index.js
· compressed	2,515	2,515	1.00
· minified	8,688	8,688	1.00
react-strict-dom/dist/dom/runtime.js
· compressed	855	855	1.00
· minified	2,435	2,435	1.00
react-strict-dom/dist/native/index.js
· compressed	15,824	15,824	1.00
· minified	59,086	59,086	1.00

[github-actions]

workflow: benchmarks/perf (native)

Comparison of performance test results, measured in operations per second. Larger is better.

Results	Base	Patch	Ratio
css.create
· small	1,139,700	1,190,815	1.04	+
· small with units	442,606	448,546	1.01	+
· small with variables	674,068	689,604	1.02	+
· several small	329,804	329,424	1.00	-
· large	215,503	211,304	0.98	-
· large with polyfills	147,583	150,839	1.02	+
· complex	101,367	102,196	1.01	+
· unsupported	226,960	225,593	0.99	-
css.createTheme
· simple theme	225,494	225,537	1.00	+
· polyfill theme	214,785	213,303	0.99	-
css.props
· small	245,848	246,178	1.00	+
· small with units	192,428	192,381	1.00	-
· small with variables	106,706	106,637	1.00	-
· small with variables of units	76,136	75,534	0.99	-
· large	104,760	104,515	1.00	-
· large with polyfills	37,685	37,572	1.00	-
· complex	24,023	24,066	1.00	+
· unsupported	154,296	153,776	1.00	-
· simple merge	165,181	164,490	1.00	-
· wide merge	18,236	18,161	1.00	-
· deep merge	17,896	17,390	0.97	-
· themed merge	32,453	32,549	1.00	+