26 lines
1.2 KiB
Markdown
26 lines
1.2 KiB
Markdown
# Rendering tests
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This directory contains rendering tests which compare a rendered map with a
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reference image using [resemble.js](http://huddle.github.io/Resemble.js/).
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Similar to the unit tests, there are two ways to run the tests: directly in the
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browser or using [SlimerJS](http://slimerjs.org/) from the command-line.
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To run the tests in the browser, make sure the development server is running
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(`make serve`) and open the URL
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[http://localhost:3000/test_rendering/index.html](http://localhost:3000/test_rendering/index.html).
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From the command-line the tests can be run with the build target `make test-rendering`.
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## Adding new tests
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When creating a new test case, a reference image has to be created. By appending `?generate`
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to the URL, a canvas with the rendered map will be shown on the page when calling
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`expectResemble`. Then the reference image can simply be created with a right-click
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and "Save image as".
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It is recommended to only run a single test case when generating the reference image.
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## Image difference
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When a test fails, an image showing the difference between the reference image and the
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rendered map can be displayed by appending `?showdiff` to the URL.
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