test(compiler-sfc): add assertion for template functional

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	90.2 kB (-8.24 kB)	34.6 kB (-2.75 kB)	31.2 kB (-2.41 kB)
vue.global.prod.js	147 kB (-9.21 kB)	54.1 kB (-3 kB)	48.1 kB (-2.63 kB)

Usages

Name	Size	Gzip	Brotli
createApp	49.7 kB (-4.3 kB)	19.5 kB (-1.44 kB)	17.8 kB (-1.27 kB)
createSSRApp	53.2 kB (-4.66 kB)	21 kB (-1.57 kB)	19.1 kB (-1.42 kB)
defineCustomElement	51.9 kB (-6.62 kB)	20.2 kB (-2.15 kB)	18.5 kB (-1.89 kB)
overall	63.2 kB (-4.35 kB)	24.5 kB (-1.45 kB)	22.3 kB (-1.27 kB)