promise-mock-test
v1.0.1
Published
Promise mock library for synchronous Promise testing
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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)
Don't Promises need to be async or else my code will break?
Nope
Use with Node and Webpack/Browserify
npm install promise-mock
Simple use with Mocha or Jasmine
Get the result of a Promise PromiseMock.getResult
var PromiseMock = require('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
var PromiseMock = require('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
var PromiseMock = require('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
var PromiseMock = require('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');
});
});
Testing
npm install
npm test
License
MIT