[mshima]

Summary

Run the tests with expect-node, node:test with the expect and mock API esmocha gives over mocha, in place of esmocha and c8.

• The environment tests a lot how modules load (require of ES modules, the import() fallback, .cjs/.mjs/.ts fixtures, sibling modules): with node:test they load as node loads them, without a transform, the TypeScript run by the type stripping of node.
• The API stays the one of esmocha: the imports of esmocha become the ones of expect-node, esmocha becoming exnode; the expect of Jest and jest-mock are the same, and the snapshot file is read as it is.
• The module mocks: every export mocked without an implementation (exnode.mock<typeof import('execa')>('execa')), the exports given merged over the module (fly-import), all with reimport: a worker keeps the modules the previous test files imported, so the module under test imported by one of them would keep the module itself (with 2 or 4 workers, the actual fly-import installed a generator, the run taking about 110 s).
• compatibility: 'mocha' keeps this.timeout, this.skip and the done tests; xit becomes it.skip.
• workers run the test files by processes reused, like mocha --parallel; the coverage of src is node's. The run takes 7.9 to 9.6 s with 1 to 8 workers or a process per test file, test/resolver.ts alone taking about 6 s.
• generator failing task emits error is skipped with yeoman-generator 4: it leaves the rejection of a failing task unhandled after the environment emits the error, which node:test reports and mocha ignored. The other versions cover the behavior.

Comparison

	esmocha + c8	expect-node
tests	994 passing, 17 pending	993 passing, 18 skipped
time	9.8 s	8.3–8.5 s
statements / lines	93.5%	94.0%
branches	88.9%	89.2%
functions	92.1%	91.1% (counted otherwise by node)

Test plan

• npm test (eslint, prettier, tsc, the tests with coverage)

🤖 Generated with Claude Code

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	expect-node@​0.3.3

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