ReasonML Quick Start Guide

Our first test

Let's create our first test in __tests__/First_test.re with something simple for now:

/* __tests__/First_test.re */open Jest;describe("Expect", () =>  Expect.(test("toBe", () =>            expect(1 + 2) |> toBe(3)          )));

Running npm test now fails with the following error:

 FAIL lib/es6/__tests__/First_test.bs.js  ● Test suite failed to run    Jest encountered an unexpected token    This usually means that you are trying to import a file which Jest    cannot parse, e.g. it's not plain JavaScript.    By default, if Jest sees a Babel config, it will use that to transform    your files, ignoring "node_modules".    Here's what you can do:     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config. ...