fix(hydration): don't error if data-allow-mismatch provided for fragment

[dmitryuk]

Fixes hydrateFragment method throws hydration mismatch error despite of data-allow-mismatch attribute exists in parent node.

fragment not enough children test was wrong since Hydration completed but contains mismatches. error was ignored in test environment and not checked at all

__TEST__ flag prevented to catch error for testing

added toHaveBeenErrored method that looks same as toHaveBeenWarned, but error level

Summary by CodeRabbit

• Tests

  • Enhanced hydration mismatch scenario test coverage with improved error assertions.
  • Added custom error assertion matcher for testing utilities.

• Chores

  • Improved hydration error logging to conditionally suppress messages when appropriate.
  • Updated test infrastructure for better error tracking and validation.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[github-actions[bot]]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+9 B)	37.9 kB (-1 B)	34.2 kB (+22 B)
vue.global.prod.js	158 kB (+9 B)	57.8 kB (+1 B)	51.5 kB (+87 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.6 kB	18.3 kB	16.7 kB
createApp	54.6 kB	21.3 kB	19.4 kB
createSSRApp	58.7 kB (+9 B)	23 kB (+4 B)	20.9 kB (-2 B)
defineCustomElement	59.4 kB	22.8 kB	20.8 kB
overall	68.4 kB	26.4 kB	24 kB

[pkg-pr-new[bot]]

Open in Stackblitz

@vue/compiler-core

npm i https://pkg.pr.new/@vue/compiler-core@12505

@vue/compiler-dom

npm i https://pkg.pr.new/@vue/compiler-dom@12505

@vue/compiler-ssr

npm i https://pkg.pr.new/@vue/compiler-ssr@12505

@vue/compiler-sfc

npm i https://pkg.pr.new/@vue/compiler-sfc@12505

@vue/reactivity

npm i https://pkg.pr.new/@vue/reactivity@12505

@vue/runtime-core

npm i https://pkg.pr.new/@vue/runtime-core@12505

@vue/runtime-dom

npm i https://pkg.pr.new/@vue/runtime-dom@12505

@vue/server-renderer

npm i https://pkg.pr.new/@vue/server-renderer@12505

@vue/shared

npm i https://pkg.pr.new/@vue/shared@12505

vue

npm i https://pkg.pr.new/vue@12505

@vue/compat

npm i https://pkg.pr.new/@vue/compat@12505

commit: 9e90946

[edison1105]

Thanks for the PR. I've made some minor tweaks https://github.com/vuejs/core/pull/12505/commits/9e909466d103658fac2604f72e9287e8559edc90 LGTM

[dmitryuk]

@edison1105 thanks you so much for instant help!

I very hope the PR will be merged next release

[dmitryuk]

@edison1105 can you merge this PR, please?