Remove unused test fixture: rsc-caching

[Copilot]

Investigated all fixtures in __fixtures__/ to identify unused projects that can be removed. After merging with main branch (which removed esm-fragment-test-project and fragment-test-project in PR #551), this PR removes the remaining unused fixture.

Changes

• Removed rsc-caching (376K) - zero references in code, tests, CI/CD, or rebuild scripts
• Added __fixtures__/README.md documenting the 7 remaining fixtures, their purposes, CI/CD dependencies, and removal guidelines
• Documented why example-todo-main-with-errors cannot be replaced with example-todo-main

Combined Results (with PR #551)

Total fixtures removed: 3

• esm-fragment-test-project (1.1M) - removed in PR chore(ci): Remove unused projects from __fixtures__ #551 and this PR
• fragment-test-project (1.1M) - removed in PR chore(ci): Remove unused projects from __fixtures__ #551
• rsc-caching (376K) - removed in this PR

Total space saved: ~2.5MB

Analysis: example-todo-main-with-errors

This fixture cannot be replaced with example-todo-main because it contains unique error conditions that are specifically tested:

1. SDL validation errors - 8 SDL files with intentional auth directive errors (missing directives, invalid roles, missing attributes, etc.)
2. Duplicate routes - Identical route definitions in Routes.js for testing route conflict detection
3. Unnamed QUERY - Cell without operation name for testing validation warnings
4. Missing vite config - Tests path detection when vite is not configured
5. JavaScript variant - Different from TypeScript-based example-todo-main

All 16 test references specifically rely on these error conditions that don't exist in example-todo-main.

Remaining Fixtures

All 7 remaining fixtures are actively used:

Core infrastructure (high usage):

• test-project - primary test fixture, used extensively
• example-todo-main - 56+ references across packages
• example-todo-main-with-errors - 16 references for error testing (cannot be replaced)

CI/CD dependencies:

• test-project-rsa - RSC smoke tests workflow
• esm-test-project - ESM smoke tests workflow
• test-project-rsc-kitchen-sink - RSC kitchen sink workflow

Specialized:

• empty-project - minimal project path/config tests

Total: ~4.2MB across 7 fixtures

No further consolidation recommended - each serves a distinct testing purpose.

Original prompt

Please investigate if any project under fixtures can be removed

If it's only used in a few places, consider copying it closer to where it's used instead

Or, can perhaps one or more project be consolidated into just one, and we use that single project in more places instead

Or, maybe, instead of having one of the separate test projects, could we perhaps use a base test project, and then just make local/temporary changes to it to fit specific test cases?

fixtures/test-project is the main project most tests use, so please be very careful before suggesting any changes to that one.

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[Tobbe]

@copilot I've merged the latest changes from the main branch. Can you please re-run your analysis? Also, can any of the uses of example-todo-main-with-errors be changed to using example-todo-main instead? Or do they all test error states only available in the example-todo-main-with-errors project?

[Copilot]

@copilot I've merged the latest changes from the main branch. Can you please re-run your analysis? Also, can any of the uses of example-todo-main-with-errors be changed to using `example-todo-main...

Re-analysis complete after merging main (commit 0b9ea55).

Current state: After the merge, 3 fixtures have been removed total:

• esm-fragment-test-project (removed in both PRs)
• fragment-test-project (removed in main PR chore(ci): Remove unused projects from __fixtures__ #551)
• rsc-caching (removed in this PR)

Regarding example-todo-main-with-errors: It cannot be replaced with example-todo-main. This fixture contains intentional errors that are specifically tested:

1. SDL validation errors - 8 different SDL files with auth directive errors (missing directives, invalid roles, missing attributes, etc.)
2. Duplicate routes - Two identical route definitions in Routes.js for testing route conflict detection
3. Unnamed QUERY - Cell without a QUERY operation name to test validation warnings
4. Missing vite config - Tests path detection when vite is not configured
5. JavaScript vs TypeScript - Different language variant

All 16 test references specifically rely on these error conditions that don't exist in example-todo-main. Updated the README with detailed documentation of these unique features.