How to access and test an internal (non-exports) function in a node.js module?

Question

I\'m trying to figure out on how to test internal (i.e. not exported) functions in nodejs (preferably with mocha or jasmine). And i have no idea!

Let say I have a mo

Answer 1

Essentially you need to merge the source context with the test cases - one way to do this would be using a small helper function wrapping the tests.

demo.js

const internalVar = 1;

demo.test.js

const importing = (sourceFile, tests) => eval(`${require('fs').readFileSync(sourceFile)};(${String(tests)})();`);


importing('./demo.js', () => {
    it('should have context access', () => {
        expect(internalVar).toBe(1);
    });
});