test: fix flakiness of stringbytes-external
Pull Request check-list
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Does make -j8 test
(UNIX) orvcbuild test nosign
(Windows) pass with this change (including linting)? -
Is the commit message formatted according to [CONTRIBUTING.md][0]? -
If this change fixes a bug (or a performance problem), is a regression test (or a benchmark) included?
Affected core subsystem(s)
test
Description of change
The tests used to rely on precise timing of when a JavaScript object would be garbage collected to ensure that there is enough memory available on the system. Switch the test to use a malloc/free pair instead.
Ref: https://github.com/nodejs/node/pull/5945
R=@bnoordhuis, @trott
CI: https://ci.nodejs.org/job/node-test-pull-request/2146/
CI: https://ci.nodejs.org/job/node-test-pull-request/2147/
CI: https://ci.nodejs.org/job/node-test-pull-request/2148/