fix: should respect config.root option

[9aoy]

Summary

fix: should respect config.root option. support run sub-project tests with specified config & root configuration in monorepo's root.

https://rstest.rs/config/test/root

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull request overview

This PR fixes config.root handling to support running sub-project tests with specified config in monorepo setups. Previously, the CLI's root option would override the config file's root setting. Now, the config file's root is properly respected.

Key changes:

• Separated the concept of cwd (where to look for config) from root (project root from config)
• Added fallback logic to set config.root to cwd if not specified in config
• Updated example configs to explicitly set root: __dirname

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/cli/init.ts	Refactored resolveConfig to accept cwd instead of root, added fallback logic for config.root
examples/node/rstest.config.ts	Added explicit root: __dirname to example config
e2e/projects/fixtures/packages/client/rstest.config.ts	Added root: __dirname to each project configuration
e2e/projects/index.test.ts	Added test to verify config root is respected when specified via -c flag

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[Copilot]

The mergeWithCLIOptions function includes 'root' in its keys array (line 52), which causes it to override config.root with options.root when the --root CLI flag is provided. This defeats the purpose of this PR, which is to respect the config file's root setting.

The issue: when options.root is provided via CLI (e.g., --root packages/client), it's still a relative string that gets copied into config.root, potentially overriding an absolute path like __dirname from the config. Later, in RstestCore, this relative path would be resolved using the wrong base, resulting in incorrect paths like /monorepo/packages/client/packages/client.

The solution: Remove 'root' from the keys array in mergeWithCLIOptions (line 52). This way:

• If the config has a root, it's preserved
• If the config doesn't have a root, the fallback at lines 120-122 sets it to options.cwd
• The CLI --root only affects where to look for the config file (via options.cwd), not the final config.root

This aligns with the PR's intent to respect the config file's root setting while allowing --root to control where configs are loaded from.