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By setting a device pixel ratio of 1.0 and increasing the tolerance for raster reprojection tests, the render tests now also run from the console on OSX devices with retina display.
Rendering tests
This directory contains rendering tests which compare a rendered map with a reference image using resemble.js.
Similar to the unit tests, there are two ways to run the tests: directly in the browser or using SlimerJS from the command-line.
To run the tests in the browser, make sure the development server is running
(make serve) and open the URL
http://localhost:3000/test_rendering/index.html.
From the command-line the tests can be run with the build target make test-rendering.
Adding new tests
When creating a new test case, a reference image has to be created. By appending ?generate
to the URL, a canvas with the rendered map will be shown on the page when calling
expectResemble. Then the reference image can simply be created with a right-click
and "Save image as".
It is recommended to only run a single test case when generating the reference image.
Image difference
When a test fails, an image showing the difference between the reference image and the
rendered map can be displayed by appending ?showdiff to the URL.