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update slow description #3466

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Dec 4, 2018
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update slow description #3466

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500e638
update slow description
finfin Aug 21, 2018
5806a28
wordsmithing
finfin Aug 25, 2018
efb2061
add threshold explanation image
finfin Nov 7, 2018
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10 changes: 9 additions & 1 deletion docs/index.md
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Expand Up @@ -665,10 +665,18 @@ $ mocha

<h2 id="test-duration">Test duration</h2>

Many reporters will display test duration, as well as flagging tests that are slow, as shown here with the "spec" reporter:
Many reporters will display test duration and flag tests that are slow (default: 75ms), as shown here with the "spec" reporter:

![test duration](images/reporter-spec-duration.png?withoutEnlargement&resize=920,9999){:class="screenshot"}

There are three levels of test duration (depicted in the following image):

1. FAST: Tests that run within half of the "slow" threshold will show the duration in green (if at all).
2. NORMAL: Tests that run exceeding half of the threshold (but still within it) will show the duration in yellow.
3. SLOW: Tests that run exceeding the threshold will show the duration in red.

![test duration range](images/test-duration-range.png?withoutEnlargement&resize=920,9999){:class="screenshot"}

To tweak what's considered "slow", you can use the `slow()` method:

```js
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