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Jasmine marbles is a set of RxJS marble testing helpers for writing tests with Jasmine or Jest.
Jest version 27 was recently released, which introduces a completely new default test runner named jest-circus. The previous jest-jasmine2 test runner contained many jasmine-specific APIs that are not in jest-circus.
With the release of version jasmine-marbles 0.8.3, both test runners are supported with RxJS 6.x. RxJS 7.x is supported in versions 0.9.0 and later, but the majority of users are on RxJS 6.x, which is what the latest major releases of Angular, Nx, NgRx, and many other libraries use.
To install the latest version:
npm install jasmine-marbles@latest --save-dev
or
yarn install jasmine-marbles@latest --dev
If you need to revert back to the previous test runner, set the testRunner in your jest.config.js to jest-jasmine2.
To learn more about testing RxJS using marble diagrams in general, check out the marble testing guide in the RxJS docs.
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