gistfile1.txt

========= a.js =============
#!/usr/bin/env node

module.exports = function A() {
    init();
}


========= test/test.js =============
var A = require('../a.js');
var assert = require('assert');

describe('A', function() {
    it('should not throw error', function() {
        global.init = function(){};
        assert.doesNotThrow(A);
    });
});


mocha --globals init

> 1 test complete (5 ms)