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doc: improve common.mustCall() explanation

PR-URL: #10390
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Julian Duque <julianduquej@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Italo A. Casas <me@italoacasas.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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Trott authored and evanlucas committed Dec 21, 2016
1 parent 826decf commit 8a9d68ad7ca061fdf40fb2ce6861a7cf086bf9e5
Showing with 4 additions and 1 deletion.
  1. +4 −1 test/README.md
@@ -290,8 +290,11 @@ Array of IPV6 hosts.
### mustCall(fn[, expected])
* fn [&lt;Function>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function)
* expected [&lt;Number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) default = 1
* return [&lt;Function>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function)

Number of times `fn` should be called.
Returns a function that calls `fn`. If the returned function has not been called
exactly `expected` number of times when the test is complete, then the test will
fail.

### nodeProcessAborted(exitCode, signal)
* `exitCode` [&lt;Number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type)

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