Moquire is a node.js module for mocking modules. Native modules such as 'fs', 'http' etc cannot be mocked with this module.
Consider following directory structure:
/src
/utils
foo.js
bar.js
/test
/utils
foo.test.js
bar.test.js
bar.js contains dependency for foo.js and installed lodash modules:
const foo = require('./utils/foo');
const lodash = require('lodash');
...
In order to load bar.js with mocked foo module in bar.test.js you can do:
//define mocks
const fooMock = {};
const lodashMock = {};
//remove previously loaded bar module in order
//to next require invocation load module from scratch
moquire.removeModuleFromCache('./../src/bar');
//replace needed module with mock
const fooRestore = moquire.replaceModuleInCache('./../src/utils/foo', fooMock);
const lodashMock = moquire.replaceModuleInCache('lodash', lodashMock);
//require bar module
const bar = require('./../src/bar');
//do the tests
//restore foo module
fooRestore.restore();
lodashMock.restore();
//remove bar module with mock from cache
moquire.removeModuleFromCache('./../src/bar');
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