node-mock-fun 
Mock functions
Install
npm install mock-fun
Usage
Use with mocha :3
.override(obj, prop[, glob])
Without glob function:
Returns a hook(fun) function, that can override prop in obj
with a wrapper function that calls fun transparently
(keeping context¶meters). The wrapper function manages the
called and calledTimes property.
fun defaults to noop.
With glob:
Returns a hook function that overrides prop in obj
with a wrapper function that calls glob transparently. Same as above.
You should use this as a before/beforeEach hook.
.restore(obj, prop[, full])
Returns a hook function that restores the original function.
You should use it as an after/afterEach hook.
Set full to restore nested overrides.
Example
var override = require('mock-fun').override;
var restore = require('mock-fun').restore;
// Override per `it`
describe('My library method `fun`', function() {
var o = override(mylib, 'otherFun');
afterEach(restore(mylib, 'otherFun'));
it('should call `otherFun`', function() {
o(); // default override function is noop
mylib.fun();
mylib.otherFun.called.should.be.true;
});
it('should call `otherFun` with correct parameter', function() {
o(function(a) {
a.should.equal('foobar');
});
mylib.fun();
});
it('should call `otherFun` with the context of `mylib`', function() {
o(function() {
this.should.equal(mylib);
});
mylib.fun();
});
});
// Override per `describe`
describe('My library method `fun`', function() {
before(override(mylib, 'findById', function(id, cb) {
cb(null, new User({ foo: 'bar' }));
}));
after(restore(mylib, 'findById'));
it('should query for a user', function() {
mylib.fun(1337, function(err, user) {
user.foo.should.equal('bar');
});
});
});License
MIT
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent