1c5fd62e43
This commit aims to simplify the computation of zoom and resolution in the View class. Previously zoom levels and resolution computations were mixed in different places, ie resolution constraints, initial values, etc. Now the View class only has the `getZoomForResolution` and `getResolutionForZoom` methods to convert from one system to another. Other than that, most computations use the resolution system internally. The `constrainResolution` method also does not exist anymore, and is replaced by `getValidResolution` and `getValidZoomLevel` public methods.
Included in this directory
-
index.html - the web page used to run the test suite.
-
spec - includes the OpenLayers test/spec files.
-
test-extensions.js - includes OpenLayers-specific extensions to the testing frameworks.
Run the test suite
Install the test dependencies (from the root of the repository):
npm install
Run the tests once:
npm test
This will run tests in Chrome. If you do not have Chrome installed, you can run tests on Firefox instead:
npm test -- --browsers Firefox
To run tests in other browsers, you need to install additional Karma launchers.
To run the tests continuously:
npm run karma
After this, the test server is listening on http://localhost:9876/, and you can attach any number of browsers for testing (during development, tests will run in Chrome by default).
Rendering tests
The test/rendering directory contains rendering tests which compare a rendered map with a
reference image using pixelmatch.
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.