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Apr 17, 2018
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Add tips for writing selection tests #2567

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Add tips for writing selection tests
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21 changes: 21 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -177,6 +177,27 @@ which shows the baseline image, the generated image, the diff and the json mocks

To view the results of a run on CircleCI, download the `build/test_images/` and `build/test_images_diff/` artifacts into your local repo and then run `npm run start-image_viewer`.

### Writing interaction tests
Keep in mind that the interaction coordinates are relative to the top-left corner of the plot, including the margins. To produce a reliable interaction test,
it may be necessary to fix the width, height, margins, X axis range and Y axis range of the plot. For example:

```
Plotly.newPlot(gd, [{
x: [1, 1, 1, 2, 2, 2, 3, 3, 3],
y: [1, 2, 3, 1, 2, 3, 1, 2, 3],
mode: 'markers'
}], {
width: 400, height: 400,
margin: {l: 100, r: 100, t: 100, b: 100},
xaxis: {range: [0, 4]},
yaxis: {range: [0, 4]}
});
```

This will produce the following plot, and say you want to simulate a selection path of (175, 175) to (225, 225):

<img src="https://user-images.githubusercontent.com/31989842/38890553-0bc6190c-4282-11e8-8efc-077bf05ca565.png">


## Repo organization

Expand Down