mock-asap

Mock ASAP (as soon as possible)

Idea

Idea of this package is to get package ready to easily setup http stubs for functional and integration testing.

This package consists of a proxy programmable via Sinon.JS stubs

Install

npm install --save mock-asap

Note: you should have Node.js with support of ES6 (at least v4.0)

Example

Here is an example how you can use mock-asap with Nightmare.js:

const mockAsap = require('./index.js');
const Nightmare = require('nightmare');
const sinon = require('sinon');
const match = sinon.match;
 
const nightmare = Nightmare({
    show: true,
    switches: {
        'proxy-server': '127.0.0.1:8889',
        'ignore-certificate-errors': true
    }
});
 
mockAsap.start()
    .then(function() {
        mockAsap.stub.http.withArgs(
            match.has('url', match('custom-avito.html'))
        ).returns(
            mockAsap.respondWith.file(__dirname + '/custom-avito.html')
        );
 
        return nightmare
            .goto('http://avito.ru/custom-avito.html')
            .evaluate(() => document.body.innerHTML);
    })
    .then(bodyHtml => console.log(bodyHtml))
    .then(() => nightmare.end())
    .then(() => mockAsap.stop());

This package uses port 8889 for communication. In order to work properly it should be free before running. Later this package will have ability to configure occupied port

Docs

mockAsap.start()

mockAsap.start starts stubs proxy server. It returns promise which will be resolved when proxy will listen for incoming messages.

Note: for now system designed in the way that permits running only one instance of mockAsap. So you should not try to run mockAsap.start() several times.

mockAsap.stop()

mockAsap.start stops stubs proxy server and browser. It returns promise which will be resolved when everything was stopped.

mockAsap.stub

mockAsap.stub contains Sinon.JS stubs used for programming proxy server behavior. It contains http and https stubs used in this way:

stub.https.withArgs(
    sinon.match.has('url', sinon.match('/rest/text/terms/'))
).returns(
    ({ proxyToClientResponse: res }) => {
        res.setHeader('Content-Type', 'text/html');
        res.end(htmlText);
    }
);

Stub argument used for getting result function - is an incoming ClientRequest (see Node.js documentation). The result function will with http-mitm-proxy Context object

There is also stubs.reset() synchronous method which resets stubs to their default behavior (i.e. just proxying).

Note: you should not store stubs.https and stubs.http to variables because otherwise everything will be broken after stubs.reset()

mockAsap.match

mockAsap.match contains helpers for simpler matching against often used rules.

mockAsap.match.url(url)

Matches if request contains url as a substring

mockAsap.stub.https.withArgs(
    mockAsap.match.url('logo-avito.svg')
).returns(
    mockAsap.respondWith.file(path.join(__dirname, 'avito/logo-avito.svg'))
);

mockAsap.respondWith

mockAsap.respondWith contains helpers for simpler responding with popular type of responses.

mockAsap.respondWith.text(text)

mockAsap.respondWith.text(text) responds with text as plain text

mockAsap.stub.https.withArgs(
    sinon.match.any
).returns(
    mockAsap.respondWith.text('Hello world!')
);

mockAsap.respondWith.html(html)

mockAsap.respondWith.html(html) responds with html as html document

mockAsap.stub.https.withArgs(
    mockAsap.match.url('index.html')
).returns(
    mockAsap.respondWith.html('<h1>Hello world!</h1>')
);

mockAsap.respondWith.json(jsObject)

mockAsap.respondWith.json(jsObject) stringifies jsObject and sends it as json

mockAsap.stub.https.withArgs(
    mockAsap.match.url('/1.json')
).returns(
    mockAsap.respondWith.json({ hello: 'world' })
);

mockAsap.respondWith.jsonTransformer(responseTransformer[, requestBodyTransformer])

mockAsap.respondWith.jsonTransformer(responseTransformer) firstly tries to get original response from server. After all data has been received, it parses response as JSON and passes it as first argument of responseTransformer function. After responseTransformer was called it passes modified data to browser (i.e. to Chrome). For example, the code below will transform request /1.json {"foo": 1, "baz": 2} to {"foo": "bar", "baz": 2}

mockAsap.stub.https.withArgs(
    mockAsap.match.url('/1.json')
).returns(
    mockAsap.respondWith.jsonTransformer(json => {
        json.foo = 'bar';
    })
);

requestBodyTransformer works in the same way. The only difference is that it tries to transform request body as JSON. For example, you may want to suppress some fields which produce some pollution or computations you would like to avoid. You can do it in this way

mockAsap.stub.https.withArgs(
    mockAsap.match.url('/2.json')
).returns(
    mockAsap.respondWith.jsonTransformer(null, json => {
        delete json.fieldIWantToHide;
    })
);

Note: transformer assumed to be a dirty function, not a pure one

mockAsap.respondWith.file(absolutePathToFile)

mockAsap.respondWith.file(absolutePathToFile) responds with content of absolutePathToFile

stub.https.withArgs(
    mockAsap.match.url('/res/7EiNlv7G_KCvanpivhp5XQ.jpg')
).returns(
    respondWith.file(path.join(__dirname, 'actiagent/meow.jpg'))
);

mockAsap.respondWith.serveStatic(pathToCut, absolutePathToDir)

mockAsap.respondWith.serveStatic(pathToCut, absolutePathToDir) replaces drops pathToCut and prepends absolutePathToDir to the rest

// Here /public/pics/1.jpeg will be answered with content of ../../pictures/1.jpeg
mockAsap.stub.https.withArgs(
    mockAsap.match.url('/public/pics')
).returns(
    mockAsap.respondWith.json('/public/pics', path.join(__dirname, '../../pictures'))
);

License

MIT