Alright I have a component called <TestButton />. Inside the <TestButton /> there are two Semantic UI React component, <Button /> and <Header>.  Basically, when the <Button> is clicked, it toggles display: none; to <H...

I am getting the following error whenever I run jest in commandline:   ? Test suite failed to run  /Users/<USER>/<Project>/src/login/LoginAPI.js:13         ...headers,         ^^^  SyntaxError: Unexpected token ...   The code that it brea...

Here's my callnapply.js file  const callAndApply = {   caller(object, method, nameArg, ageArg, tShirtSizeArg) {     method.call(object, nameArg, ageArg, tShirtSizeArg);   },   applier(object, method, argumentsArr) {     method.apply(object, argum...

I just finished writing my first Reactjs component and I am ready to write some tests (I used material-ui's Table and Toggle). I read about jest and enzyme but I feel that I am still missing something.  My component looks like this (simplified):...

In ChangesFactory-test.js I am importing the class I want to test like so:  import ChangesFactory from 'path/to/src/ChangesFactory'  I am trying to create an instance in a test case like this:  describe('Changes', function () { it (&#...

I have spent a long time looking at other questions about this and looking at other projects on Github but none of the answers seem to work for me.  I am loading a third party library in my project, and when running Jest tests I get the error  export...

class TestObject {   constructor(value) {     if (value === null || value === undefined) {       throw new Error('Expect a value!');     }   } }  describe('test the constructor', () => {   test('it works', () => {     ex...

i have many jest tests, within many test suites, within many test files  i need to isolate and debug a single test  i'm debugging via node --inspect-brk ./node_modules/jest/bin/jest, so other solutions involving watch mode are too complicated  ho...

really battling here.  My Circle CI tests have failed with a  FAIL  ./App.test.js   ? Test suite failed to run      SyntaxError: Unexpected token )   I try to run Jest locally on my machine (a CRNA one) but i get the following error:  TypeError: envi...

Let's say I have a class like following:  class SomeClass {   constructor(a, b) {     this.a = a;     this.b = b;   } }   How can I test through Jest that constructor was initialized the right way? Say... this.a = a and this.b = b and not vice ve...