Error with JEST tests on TRAVIS-CI - continuous-integration

Question

Error
Error: /home/travis/build/ElectronicaGitHub/pictureAvenue/node_modules/jest-
cli/node_modules/jsdom/node_modules/contextify/build/
Release/contextify.node: invalid ELF header
That's happening when i'm trying to start JEST tests, it's just example test from JEST tutorial and looks like
jest.dontMock('../sum');
describe('sum', function() {
it('adds 1 + 2 to equal 3', function() {
var sum = require('../sum');
expect(sum(1, 2)).toBe(3);
});
});
Locally test with JEST runs fine.
Tried to start mocha tests on travis-ci and it's ok!
But my project on ReactJS and i they advise to use JEST for tests.
How to fix that problem?

Answer 1

Found your project on GH: https://github.com/ElectronicaGitHub/pictureAvenue
Almost guaranteed that this is because you checked in the node_modules folder. This should be downloaded by each consumer of the project, using npm install. Add a .gitignore file to the root of your project with the following content:
node_modules
Before you do this, you'll need to do:
rm -fr node_modules && \
git commit -a -m 'remove node_modules from source control' && \
git push origin master
Then add your .gitignore file and do another commit.
While you're at it, it looks like you're also checking in your sass-cache (.sass-cache\*). You'll want to do the same thing.
Final thoughts:
Typically source control is great for any artifact or code, it is not great for things that are often OS dependent (like node_modules) or host dependent (.sass-cache).
Hope that helps.