Swirly Diagram Testrunner

Provides an easy-to-use way to generate a marble diagram from unit tests. The Swirly library is used to generate the diagrams.

At the moment it can only be used with Chai. In the future other assertion libraries will be supported.

Example unit test

import { DiagramTestScheduler } from "swirly-diagram-testrunner"
import { renderMarbleDiagram } from '@swirly/renderer-node';
import { styles } from '@swirly/theme-default-light';
import { DiagramSpecification } from '@swirly/types';

describe('DiagramTestScheduler', () => {
    let scheduler: DiagramTestScheduler;
    let diagram: DiagramSpecification;

    beforeEach(() => {
        scheduler = new DiagramTestScheduler();
    })

    it('should give a diagram', () => {
        diagram = scheduler.runAsDiagram('filter(n => n % 2 != 0)', ({ cold, expectObservable }) => {
            const source = cold<number>("-1-2-3|", { 1: 1, 2: 2, 3: 3 });
            const testee = source.pipe(filter(n => n % 2 !== 0));

            expectObservable(testee).toBe("-1---3|", { 1: 1, 3: 3 })
        })
        console.log("diagram %o", diagram);
    });

    afterEach(() => {
        const r = renderMarbleDiagram(diagram, { styles })
        console.log(r.xml);
    })
})