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Chris Tate
05cb9bd609
node:test changes, matching Node 24.22:
- { concurrency } on describe, suite, test, it and t.test sets how many
subtests run at once: a number, true for os.availableParallelism() - 1,
or false for 1. Subtests inherit the parent's value.
- Above 1, each subtest runs on its own fiber. Subtests start in
declaration order as slots free up, and t.test and test() calls inside a
concurrent test start the subtest at once; t.test's promise settles when
it finishes. The parent finishes after all of them.
- Results, diagnostics and failures are reported in declaration order.
- A concurrent subtest waits after its beforeEach hooks, and a concurrent
suite before its children, for as many turns as Node's runner does, so
sibling bodies interleave as they do there.
- A concurrency that is not an integer from 1 to 4294967295 throws Node's
ERR_OUT_OF_RANGE RangeError when the test or suite is created.
- Nested test() calls and hooks inside a concurrent subtest attach to the
subtest that runs on the calling fiber.
The concurrency fixture compares the reporter output, the order of the
bodies' side effects, and the range errors with Node, plain and with
SCRIPTC_SAN=1.