promise-mock

promise-mock 
=============
Promise mocking library to make Promises resolve synchronously

Why

- Tests are faster
- Don't need done() function
- Stack traces are preserved / Easier debugging
- Can be easier to write tests (depends)

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Nope

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``
npm install promise-mock
`

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Get the result of a Promise PromiseMock.getResult
`js
import PromiseMock from 'promise-mock';

describe('testing', function() {
beforeEach(function() {
PromiseMock.install()
});
afterEach(function() {
PromiseMock.uninstall();
});
it('Sync Promise test', function() {
var result = PromiseMock.getResult(Promise.resolve('hello')));
expect(result).toBe('hello');
});

});
`

Handle errors synchronously
`js
import PromiseMock from 'promise-mock';

describe('testing', function() {
beforeEach(function() {
PromiseMock.install()
});
afterEach(function() {
PromiseMock.uninstall();
});
it('Sync Promise test', function() {
expect(function() {
PromiseMock.getResult(Promise.reject(new Error('An error')));
}).toThrow(new Error('An Error'));
});
});
`

Execute a single async callback
`js
import PromiseMock from 'promise-mock';

describe('testing', function() {
beforeEach(function() {
PromiseMock.install()
});
afterEach(function() {
PromiseMock.uninstall();
});
it('Sync Promise test', function() {
var result;
Promise.resolve('hello').then(function(data) {
result = data;
});
Promise.run();
expect(result).toBe('hello');
});

});
`
Resolve all pending Promises
`js
import PromiseMock from 'promise-mock';

describe('testing', function() {
beforeEach(function() {
PromiseMock.install()
});
afterEach(function() {
PromiseMock.uninstall();
});
it('Sync Promise test', function() {
var result1, result2, result3;
Promise.resolve('hello1').then(function(data) {
result1 = data;
return 'hello2';
}).then(function(data) {
result2 = data;
return 'hello3';
}).then(function(data) {
result3 = data;
});;
Promise.runAll();
expect(result1).toBe('hello1');
expect(result2).toBe('hello2');
expect(result3).toBe('hello3');
});

});
`

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Since the move to ES6 modules. You need to add .default
`js
const PromiseMock = require('promise-mock').default;

`

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`
npm install
npm test
``

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MIT