Tags: Add MDX test cases

[shilman]

Add test cases for MDX handling, which is already supported in the code.

🦋 Canary release

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core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

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buildSize	7.19 MB	7.19 MB	0 B	-1.18	0%
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buildSbPreviewSize	0 B	0 B	0 B	-	-
buildStaticSize	0 B	0 B	0 B	-	-
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buildPreviewSize	3.28 MB	3.28 MB	0 B	-	0%
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name	before	after	diff	z	%
createTime	7s	23.9s	16.9s	2.65	🔺70.8%
generateTime	19.7s	21.6s	1.9s	0.49	8.8%
initTime	13.2s	13.8s	645ms	-0.26	4.7%
buildTime	9.4s	9.1s	-359ms	-0.22	-3.9%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	4.5s	5s	455ms	-0.34	9.1%
devManagerResponsive	3.3s	3.8s	513ms	0.06	13.2%
devManagerHeaderVisible	558ms	535ms	-23ms	-0.84	-4.3%
devManagerIndexVisible	569ms	546ms	-23ms	-0.92	-4.2%
devStoryVisibleUncached	1.9s	1.8s	-73ms	-0.29	-3.9%
devStoryVisible	588ms	565ms	-23ms	-0.89	-4.1%
devAutodocsVisible	534ms	481ms	-53ms	-0.97	-11%
devMDXVisible	459ms	472ms	13ms	-0.77	2.8%
buildManagerHeaderVisible	548ms	565ms	17ms	-0.52	3%
buildManagerIndexVisible	687ms	661ms	-26ms	-0.43	-3.9%
buildStoryVisible	536ms	553ms	17ms	-0.52	3.1%
buildAutodocsVisible	427ms	437ms	10ms	-0.89	2.3%
buildMDXVisible	423ms	465ms	42ms	-0.44	9%

Greptile Summary

Added test cases to verify MDX tag handling functionality in Storybook's documentation system, ensuring proper indexing and processing of custom tags in MDX files.

• Added code/addons/docs/template/stories/docs2/Tags.mdx demonstrating Meta component with tags property
• Added test case in StoryIndexGenerator.test.ts to verify MDX files with tags are properly indexed
• Added mock data file __mockdata__/src/docs2/Tags.mdx for testing tag handling
• Modified stories-json.test.ts to validate custom tags ('foo', 'bar') are preserved alongside default tags

[greptile-apps]

LGTM

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit bc1ba19.

Command	Status	Duration	Result
nx run-many -t build --parallel=3	✅ Succeeded	1m 37s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-01-02 09:00:16 UTC

[storybook-pr-benchmarking]

Package Benchmarks

^{Commit: bc1ba19, ran on 2 January 2025 at 09:08:45 UTC}

No significant changes detected, all good. 👏