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docs(testing): describe coverage blackboxing rules (#7483)

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Casper Beyer 2020-09-15 09:23:20 +08:00 • committed by GitHub
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@ -209,8 +209,11 @@ deno test --failfast
Deno will automatically determine test coverage for your code if you specify the
`--coverage` flag when starting `deno test`. Coverage is determined on a line by
line basis, and is acquired directly from the JavaScript runtime (V8). Because
of this, this coverage is very accurate.
line basis for modules that share the parent directory with at-least one test
module that is being executed.
This coverage information is acquired directly from the JavaScript runtime (V8).
Because of this, the coverage reports are very accurate.
When all tests are done running a summary of coverage per file is printed to
stdout. In the future there will be support for `lcov` output too.