The Jest demo shows how to use Jest for unit testing a yFiles for HTML application.
To run the unit tests:
- Go to the demo's directory
- Run the unit tests with
npm run test.
yFiles and Jest
support for native es-modules is still experimental. For this reason, es-modules code is
transpiled. Due to its size, transpiling the yFiles es-modules library is rather slow.
As workaround, it is possible to map the es-modules variant of yFiles to its UMD
variant, which does not need to be transpiled. This can be achieved with Jest's
moduleNameMapper configuration option.
Some parts of yFiles require a complete DOM implementation, which Jest's JSDOM
environment does not provide. To still be able to test code that uses yFiles API that
require a DOM, it is necessary to mock yFiles. See the
tests/ItemFactoryWithMock.test.js file for details.