element-web/test/mock-request.js

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"use strict";
var q = require("q");
var expect = require('expect');
/**
* Construct a mock HTTP backend, heavily inspired by Angular.js.
* @constructor
*/
function HttpBackend() {
this.requests = [];
this.expectedRequests = [];
var self = this;
// the request function dependency that the SDK needs.
this.requestFn = function(opts, callback) {
var realReq = new Request(opts.method, opts.uri, opts.body, opts.qs);
realReq.callback = callback;
console.log("HTTP backend received request: %s %s", opts.method, opts.uri);
self.requests.push(realReq);
var abort = function() {
var idx = self.requests.indexOf(realReq);
if (idx >= 0) {
console.log("Aborting HTTP request: %s %s", opts.method, opts.uri);
self.requests.splice(idx, 1);
}
}
return {
abort: abort
};
};
}
HttpBackend.prototype = {
/**
* Respond to all of the requests (flush the queue).
* @param {string} path The path to flush (optional) default: all.
* @param {integer} numToFlush The number of things to flush (optional), default: all.
* @return {Promise} resolved when there is nothing left to flush.
*/
flush: function(path, numToFlush) {
var defer = q.defer();
var self = this;
var flushed = 0;
var triedWaiting = false;
console.log(
"HTTP backend flushing... (path=%s numToFlush=%s)", path, numToFlush
);
var tryFlush = function() {
// if there's more real requests and more expected requests, flush 'em.
console.log(
" trying to flush queue => reqs=%s expected=%s [%s]",
self.requests.length, self.expectedRequests.length, path
);
if (self._takeFromQueue(path)) {
// try again on the next tick.
console.log(" flushed. Trying for more. [%s]", path);
flushed += 1;
if (numToFlush && flushed === numToFlush) {
console.log(" [%s] Flushed assigned amount: %s", path, numToFlush);
defer.resolve();
}
else {
setTimeout(tryFlush, 0);
}
}
else if (flushed === 0 && !triedWaiting) {
// we may not have made the request yet, wait a generous amount of
// time before giving up.
setTimeout(tryFlush, 5);
triedWaiting = true;
}
else {
console.log(" no more flushes. [%s]", path);
defer.resolve();
}
};
setTimeout(tryFlush, 0);
return defer.promise;
},
/**
* Attempts to resolve requests/expected requests.
* @param {string} path The path to flush (optional) default: all.
* @return {boolean} true if something was resolved.
*/
_takeFromQueue: function(path) {
var req = null;
var i, j;
var matchingReq, expectedReq, testResponse = null;
for (i = 0; i < this.requests.length; i++) {
req = this.requests[i];
for (j = 0; j < this.expectedRequests.length; j++) {
expectedReq = this.expectedRequests[j];
if (path && path !== expectedReq.path) { continue; }
if (expectedReq.method === req.method &&
req.path.indexOf(expectedReq.path) !== -1) {
if (!expectedReq.data || (JSON.stringify(expectedReq.data) ===
JSON.stringify(req.data))) {
matchingReq = expectedReq;
this.expectedRequests.splice(j, 1);
break;
}
}
}
if (matchingReq) {
// remove from request queue
this.requests.splice(i, 1);
i--;
for (j = 0; j < matchingReq.checks.length; j++) {
matchingReq.checks[j](req);
}
testResponse = matchingReq.response;
console.log(" responding to %s", matchingReq.path);
var body = testResponse.body;
if (Object.prototype.toString.call(body) == "[object Function]") {
body = body(req.path, req.data);
}
req.callback(
testResponse.err, testResponse.response, body
);
matchingReq = null;
}
}
if (testResponse) { // flushed something
return true;
}
return false;
},
/**
* Makes sure that the SDK hasn't sent any more requests to the backend.
*/
verifyNoOutstandingRequests: function() {
var firstOutstandingReq = this.requests[0] || {};
expect(this.requests.length).toEqual(0,
"Expected no more HTTP requests but received request to " +
firstOutstandingReq.path
);
},
/**
* Makes sure that the test doesn't have any unresolved requests.
*/
verifyNoOutstandingExpectation: function() {
var firstOutstandingExpectation = this.expectedRequests[0] || {};
expect(this.expectedRequests.length).toEqual(
0,
"Expected to see HTTP request for "
+ firstOutstandingExpectation.method
+ " " + firstOutstandingExpectation.path
);
},
/**
* Create an expected request.
* @param {string} method The HTTP method
* @param {string} path The path (which can be partial)
* @param {Object} data The expected data.
* @return {Request} An expected request.
*/
when: function(method, path, data) {
var pendingReq = new Request(method, path, data);
this.expectedRequests.push(pendingReq);
return pendingReq;
}
};
function Request(method, path, data, queryParams) {
this.method = method;
this.path = path;
this.data = data;
this.queryParams = queryParams;
this.callback = null;
this.response = null;
this.checks = [];
}
Request.prototype = {
/**
* Execute a check when this request has been satisfied.
* @param {Function} fn The function to execute.
* @return {Request} for chaining calls.
*/
check: function(fn) {
this.checks.push(fn);
return this;
},
/**
* Respond with the given data when this request is satisfied.
* @param {Number} code The HTTP status code.
* @param {Object|Function} data The HTTP JSON body. If this is a function,
* it will be invoked when the JSON body is required (which should be returned).
*/
respond: function(code, data) {
this.response = {
response: {
statusCode: code,
headers: {}
},
body: data,
err: null
};
},
/**
* Fail with an Error when this request is satisfied.
* @param {Number} code The HTTP status code.
* @param {Error} err The error to throw (e.g. Network Error)
*/
fail: function(code, err) {
this.response = {
response: {
statusCode: code,
headers: {}
},
body: null,
err: err
};
},
};
/**
* The HttpBackend class.
*/
module.exports = HttpBackend;