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2130 lines (1896 loc) · 66.5 KB
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'use strict';
/**
* @license AngularJS v1.2.0
* (c) 2010-2012 Google, Inc. http://angularjs.org
* License: MIT
*
* TODO(vojta): wrap whole file into closure during build
*/
/**
* @ngdoc overview
* @name angular.mock
* @description
*
* Namespace from 'angular-mocks.js' which contains testing related code.
*/
angular.mock = {};
/**
* ! This is a private undocumented service !
*
* @name ngMock.$browser
*
* @description
* This service is a mock implementation of {@link ng.$browser}. It provides fake
* implementation for commonly used browser apis that are hard to test, e.g. setTimeout, xhr,
* cookies, etc...
*
* The api of this service is the same as that of the real {@link ng.$browser $browser}, except
* that there are several helper methods available which can be used in tests.
*/
angular.mock.$BrowserProvider = function() {
this.$get = function() {
return new angular.mock.$Browser();
};
};
angular.mock.$Browser = function() {
var self = this;
this.isMock = true;
self.$$url = "http://server/";
self.$$lastUrl = self.$$url; // used by url polling fn
self.pollFns = [];
// TODO(vojta): remove this temporary api
self.$$completeOutstandingRequest = angular.noop;
self.$$incOutstandingRequestCount = angular.noop;
// register url polling fn
self.onUrlChange = function(listener) {
self.pollFns.push(
function() {
if (self.$$lastUrl != self.$$url) {
self.$$lastUrl = self.$$url;
listener(self.$$url);
}
}
);
return listener;
};
self.cookieHash = {};
self.lastCookieHash = {};
self.deferredFns = [];
self.deferredNextId = 0;
self.defer = function(fn, delay) {
delay = delay || 0;
self.deferredFns.push({time:(self.defer.now + delay), fn:fn, id: self.deferredNextId});
self.deferredFns.sort(function(a,b){ return a.time - b.time;});
return self.deferredNextId++;
};
/**
* @name ngMock.$browser#defer.now
* @propertyOf ngMock.$browser
*
* @description
* Current milliseconds mock time.
*/
self.defer.now = 0;
self.defer.cancel = function(deferId) {
var fnIndex;
angular.forEach(self.deferredFns, function(fn, index) {
if (fn.id === deferId) fnIndex = index;
});
if (fnIndex !== undefined) {
self.deferredFns.splice(fnIndex, 1);
return true;
}
return false;
};
/**
* @name ngMock.$browser#defer.flush
* @methodOf ngMock.$browser
*
* @description
* Flushes all pending requests and executes the defer callbacks.
*
* @param {number=} number of milliseconds to flush. See {@link #defer.now}
*/
self.defer.flush = function(delay) {
if (angular.isDefined(delay)) {
self.defer.now += delay;
} else {
if (self.deferredFns.length) {
self.defer.now = self.deferredFns[self.deferredFns.length-1].time;
} else {
throw new Error('No deferred tasks to be flushed');
}
}
while (self.deferredFns.length && self.deferredFns[0].time <= self.defer.now) {
self.deferredFns.shift().fn();
}
};
self.$$baseHref = '';
self.baseHref = function() {
return this.$$baseHref;
};
};
angular.mock.$Browser.prototype = {
/**
* @name ngMock.$browser#poll
* @methodOf ngMock.$browser
*
* @description
* run all fns in pollFns
*/
poll: function poll() {
angular.forEach(this.pollFns, function(pollFn){
pollFn();
});
},
addPollFn: function(pollFn) {
this.pollFns.push(pollFn);
return pollFn;
},
url: function(url, replace) {
if (url) {
this.$$url = url;
return this;
}
return this.$$url;
},
cookies: function(name, value) {
if (name) {
if (angular.isUndefined(value)) {
delete this.cookieHash[name];
} else {
if (angular.isString(value) && //strings only
value.length <= 4096) { //strict cookie storage limits
this.cookieHash[name] = value;
}
}
} else {
if (!angular.equals(this.cookieHash, this.lastCookieHash)) {
this.lastCookieHash = angular.copy(this.cookieHash);
this.cookieHash = angular.copy(this.cookieHash);
}
return this.cookieHash;
}
},
notifyWhenNoOutstandingRequests: function(fn) {
fn();
}
};
/**
* @ngdoc object
* @name ngMock.$exceptionHandlerProvider
*
* @description
* Configures the mock implementation of {@link ng.$exceptionHandler} to rethrow or to log errors
* passed into the `$exceptionHandler`.
*/
/**
* @ngdoc object
* @name ngMock.$exceptionHandler
*
* @description
* Mock implementation of {@link ng.$exceptionHandler} that rethrows or logs errors passed
* into it. See {@link ngMock.$exceptionHandlerProvider $exceptionHandlerProvider} for configuration
* information.
*
*
* <pre>
* describe('$exceptionHandlerProvider', function() {
*
* it('should capture log messages and exceptions', function() {
*
* module(function($exceptionHandlerProvider) {
* $exceptionHandlerProvider.mode('log');
* });
*
* inject(function($log, $exceptionHandler, $timeout) {
* $timeout(function() { $log.log(1); });
* $timeout(function() { $log.log(2); throw 'banana peel'; });
* $timeout(function() { $log.log(3); });
* expect($exceptionHandler.errors).toEqual([]);
* expect($log.assertEmpty());
* $timeout.flush();
* expect($exceptionHandler.errors).toEqual(['banana peel']);
* expect($log.log.logs).toEqual([[1], [2], [3]]);
* });
* });
* });
* </pre>
*/
angular.mock.$ExceptionHandlerProvider = function() {
var handler;
/**
* @ngdoc method
* @name ngMock.$exceptionHandlerProvider#mode
* @methodOf ngMock.$exceptionHandlerProvider
*
* @description
* Sets the logging mode.
*
* @param {string} mode Mode of operation, defaults to `rethrow`.
*
* - `rethrow`: If any errors are passed into the handler in tests, it typically
* means that there is a bug in the application or test, so this mock will
* make these tests fail.
* - `log`: Sometimes it is desirable to test that an error is thrown, for this case the `log`
* mode stores an array of errors in `$exceptionHandler.errors`, to allow later
* assertion of them. See {@link ngMock.$log#assertEmpty assertEmpty()} and
* {@link ngMock.$log#reset reset()}
*/
this.mode = function(mode) {
switch(mode) {
case 'rethrow':
handler = function(e) {
throw e;
};
break;
case 'log':
var errors = [];
handler = function(e) {
if (arguments.length == 1) {
errors.push(e);
} else {
errors.push([].slice.call(arguments, 0));
}
};
handler.errors = errors;
break;
default:
throw new Error("Unknown mode '" + mode + "', only 'log'/'rethrow' modes are allowed!");
}
};
this.$get = function() {
return handler;
};
this.mode('rethrow');
};
/**
* @ngdoc service
* @name ngMock.$log
*
* @description
* Mock implementation of {@link ng.$log} that gathers all logged messages in arrays
* (one array per logging level). These arrays are exposed as `logs` property of each of the
* level-specific log function, e.g. for level `error` the array is exposed as `$log.error.logs`.
*
*/
angular.mock.$LogProvider = function() {
var debug = true;
function concat(array1, array2, index) {
return array1.concat(Array.prototype.slice.call(array2, index));
}
this.debugEnabled = function(flag) {
if (angular.isDefined(flag)) {
debug = flag;
return this;
} else {
return debug;
}
};
this.$get = function () {
var $log = {
log: function() { $log.log.logs.push(concat([], arguments, 0)); },
warn: function() { $log.warn.logs.push(concat([], arguments, 0)); },
info: function() { $log.info.logs.push(concat([], arguments, 0)); },
error: function() { $log.error.logs.push(concat([], arguments, 0)); },
debug: function() {
if (debug) {
$log.debug.logs.push(concat([], arguments, 0));
}
}
};
/**
* @ngdoc method
* @name ngMock.$log#reset
* @methodOf ngMock.$log
*
* @description
* Reset all of the logging arrays to empty.
*/
$log.reset = function () {
/**
* @ngdoc property
* @name ngMock.$log#log.logs
* @propertyOf ngMock.$log
*
* @description
* Array of messages logged using {@link ngMock.$log#log}.
*
* @example
* <pre>
* $log.log('Some Log');
* var first = $log.log.logs.unshift();
* </pre>
*/
$log.log.logs = [];
/**
* @ngdoc property
* @name ngMock.$log#info.logs
* @propertyOf ngMock.$log
*
* @description
* Array of messages logged using {@link ngMock.$log#info}.
*
* @example
* <pre>
* $log.info('Some Info');
* var first = $log.info.logs.unshift();
* </pre>
*/
$log.info.logs = [];
/**
* @ngdoc property
* @name ngMock.$log#warn.logs
* @propertyOf ngMock.$log
*
* @description
* Array of messages logged using {@link ngMock.$log#warn}.
*
* @example
* <pre>
* $log.warn('Some Warning');
* var first = $log.warn.logs.unshift();
* </pre>
*/
$log.warn.logs = [];
/**
* @ngdoc property
* @name ngMock.$log#error.logs
* @propertyOf ngMock.$log
*
* @description
* Array of messages logged using {@link ngMock.$log#error}.
*
* @example
* <pre>
* $log.log('Some Error');
* var first = $log.error.logs.unshift();
* </pre>
*/
$log.error.logs = [];
/**
* @ngdoc property
* @name ngMock.$log#debug.logs
* @propertyOf ngMock.$log
*
* @description
* Array of messages logged using {@link ngMock.$log#debug}.
*
* @example
* <pre>
* $log.debug('Some Error');
* var first = $log.debug.logs.unshift();
* </pre>
*/
$log.debug.logs = [];
};
/**
* @ngdoc method
* @name ngMock.$log#assertEmpty
* @methodOf ngMock.$log
*
* @description
* Assert that the all of the logging methods have no logged messages. If messages present, an
* exception is thrown.
*/
$log.assertEmpty = function() {
var errors = [];
angular.forEach(['error', 'warn', 'info', 'log', 'debug'], function(logLevel) {
angular.forEach($log[logLevel].logs, function(log) {
angular.forEach(log, function (logItem) {
errors.push('MOCK $log (' + logLevel + '): ' + String(logItem) + '\n' +
(logItem.stack || ''));
});
});
});
if (errors.length) {
errors.unshift("Expected $log to be empty! Either a message was logged unexpectedly, or "+
"an expected log message was not checked and removed:");
errors.push('');
throw new Error(errors.join('\n---------\n'));
}
};
$log.reset();
return $log;
};
};
/**
* @ngdoc service
* @name ngMock.$interval
*
* @description
* Mock implementation of the $interval service.
*
* Use {@link ngMock.$interval#methods_flush `$interval.flush(millis)`} to
* move forward by `millis` milliseconds and trigger any functions scheduled to run in that
* time.
*
* @param {function()} fn A function that should be called repeatedly.
* @param {number} delay Number of milliseconds between each function call.
* @param {number=} [count=0] Number of times to repeat. If not set, or 0, will repeat
* indefinitely.
* @param {boolean=} [invokeApply=true] If set to `false` skips model dirty checking, otherwise
* will invoke `fn` within the {@link ng.$rootScope.Scope#methods_$apply $apply} block.
* @returns {promise} A promise which will be notified on each iteration.
*/
angular.mock.$IntervalProvider = function() {
this.$get = ['$rootScope', '$q',
function($rootScope, $q) {
var repeatFns = [],
nextRepeatId = 0,
now = 0;
var $interval = function(fn, delay, count, invokeApply) {
var deferred = $q.defer(),
promise = deferred.promise,
iteration = 0,
skipApply = (angular.isDefined(invokeApply) && !invokeApply);
count = (angular.isDefined(count)) ? count : 0,
promise.then(null, null, fn);
promise.$$intervalId = nextRepeatId;
function tick() {
deferred.notify(iteration++);
if (count > 0 && iteration >= count) {
var fnIndex;
deferred.resolve(iteration);
angular.forEach(repeatFns, function(fn, index) {
if (fn.id === promise.$$intervalId) fnIndex = index;
});
if (fnIndex !== undefined) {
repeatFns.splice(fnIndex, 1);
}
}
if (!skipApply) $rootScope.$apply();
}
repeatFns.push({
nextTime:(now + delay),
delay: delay,
fn: tick,
id: nextRepeatId,
deferred: deferred
});
repeatFns.sort(function(a,b){ return a.nextTime - b.nextTime;});
nextRepeatId++;
return promise;
};
$interval.cancel = function(promise) {
var fnIndex;
angular.forEach(repeatFns, function(fn, index) {
if (fn.id === promise.$$intervalId) fnIndex = index;
});
if (fnIndex !== undefined) {
repeatFns[fnIndex].deferred.reject('canceled');
repeatFns.splice(fnIndex, 1);
return true;
}
return false;
};
/**
* @ngdoc method
* @name ngMock.$interval#flush
* @methodOf ngMock.$interval
* @description
*
* Runs interval tasks scheduled to be run in the next `millis` milliseconds.
*
* @param {number=} millis maximum timeout amount to flush up until.
*
* @return {number} The amount of time moved forward.
*/
$interval.flush = function(millis) {
now += millis;
while (repeatFns.length && repeatFns[0].nextTime <= now) {
var task = repeatFns[0];
task.fn();
task.nextTime += task.delay;
repeatFns.sort(function(a,b){ return a.nextTime - b.nextTime;});
}
return millis;
};
return $interval;
}];
};
/* jshint -W101 */
/* The R_ISO8061_STR regex is never going to fit into the 100 char limit!
* This directive should go inside the anonymous function but a bug in JSHint means that it would
* not be enacted early enough to prevent the warning.
*/
(function() {
var R_ISO8061_STR = /^(\d{4})-?(\d\d)-?(\d\d)(?:T(\d\d)(?:\:?(\d\d)(?:\:?(\d\d)(?:\.(\d{3}))?)?)?(Z|([+-])(\d\d):?(\d\d)))?$/;
function jsonStringToDate(string) {
var match;
if (match = string.match(R_ISO8061_STR)) {
var date = new Date(0),
tzHour = 0,
tzMin = 0;
if (match[9]) {
tzHour = int(match[9] + match[10]);
tzMin = int(match[9] + match[11]);
}
date.setUTCFullYear(int(match[1]), int(match[2]) - 1, int(match[3]));
date.setUTCHours(int(match[4]||0) - tzHour,
int(match[5]||0) - tzMin,
int(match[6]||0),
int(match[7]||0));
return date;
}
return string;
}
function int(str) {
return parseInt(str, 10);
}
function padNumber(num, digits, trim) {
var neg = '';
if (num < 0) {
neg = '-';
num = -num;
}
num = '' + num;
while(num.length < digits) num = '0' + num;
if (trim)
num = num.substr(num.length - digits);
return neg + num;
}
/**
* @ngdoc object
* @name angular.mock.TzDate
* @description
*
* *NOTE*: this is not an injectable instance, just a globally available mock class of `Date`.
*
* Mock of the Date type which has its timezone specified via constructor arg.
*
* The main purpose is to create Date-like instances with timezone fixed to the specified timezone
* offset, so that we can test code that depends on local timezone settings without dependency on
* the time zone settings of the machine where the code is running.
*
* @param {number} offset Offset of the *desired* timezone in hours (fractions will be honored)
* @param {(number|string)} timestamp Timestamp representing the desired time in *UTC*
*
* @example
* !!!! WARNING !!!!!
* This is not a complete Date object so only methods that were implemented can be called safely.
* To make matters worse, TzDate instances inherit stuff from Date via a prototype.
*
* We do our best to intercept calls to "unimplemented" methods, but since the list of methods is
* incomplete we might be missing some non-standard methods. This can result in errors like:
* "Date.prototype.foo called on incompatible Object".
*
* <pre>
* var newYearInBratislava = new TzDate(-1, '2009-12-31T23:00:00Z');
* newYearInBratislava.getTimezoneOffset() => -60;
* newYearInBratislava.getFullYear() => 2010;
* newYearInBratislava.getMonth() => 0;
* newYearInBratislava.getDate() => 1;
* newYearInBratislava.getHours() => 0;
* newYearInBratislava.getMinutes() => 0;
* newYearInBratislava.getSeconds() => 0;
* </pre>
*
*/
angular.mock.TzDate = function (offset, timestamp) {
var self = new Date(0);
if (angular.isString(timestamp)) {
var tsStr = timestamp;
self.origDate = jsonStringToDate(timestamp);
timestamp = self.origDate.getTime();
if (isNaN(timestamp))
throw {
name: "Illegal Argument",
message: "Arg '" + tsStr + "' passed into TzDate constructor is not a valid date string"
};
} else {
self.origDate = new Date(timestamp);
}
var localOffset = new Date(timestamp).getTimezoneOffset();
self.offsetDiff = localOffset*60*1000 - offset*1000*60*60;
self.date = new Date(timestamp + self.offsetDiff);
self.getTime = function() {
return self.date.getTime() - self.offsetDiff;
};
self.toLocaleDateString = function() {
return self.date.toLocaleDateString();
};
self.getFullYear = function() {
return self.date.getFullYear();
};
self.getMonth = function() {
return self.date.getMonth();
};
self.getDate = function() {
return self.date.getDate();
};
self.getHours = function() {
return self.date.getHours();
};
self.getMinutes = function() {
return self.date.getMinutes();
};
self.getSeconds = function() {
return self.date.getSeconds();
};
self.getMilliseconds = function() {
return self.date.getMilliseconds();
};
self.getTimezoneOffset = function() {
return offset * 60;
};
self.getUTCFullYear = function() {
return self.origDate.getUTCFullYear();
};
self.getUTCMonth = function() {
return self.origDate.getUTCMonth();
};
self.getUTCDate = function() {
return self.origDate.getUTCDate();
};
self.getUTCHours = function() {
return self.origDate.getUTCHours();
};
self.getUTCMinutes = function() {
return self.origDate.getUTCMinutes();
};
self.getUTCSeconds = function() {
return self.origDate.getUTCSeconds();
};
self.getUTCMilliseconds = function() {
return self.origDate.getUTCMilliseconds();
};
self.getDay = function() {
return self.date.getDay();
};
// provide this method only on browsers that already have it
if (self.toISOString) {
self.toISOString = function() {
return padNumber(self.origDate.getUTCFullYear(), 4) + '-' +
padNumber(self.origDate.getUTCMonth() + 1, 2) + '-' +
padNumber(self.origDate.getUTCDate(), 2) + 'T' +
padNumber(self.origDate.getUTCHours(), 2) + ':' +
padNumber(self.origDate.getUTCMinutes(), 2) + ':' +
padNumber(self.origDate.getUTCSeconds(), 2) + '.' +
padNumber(self.origDate.getUTCMilliseconds(), 3) + 'Z';
};
}
//hide all methods not implemented in this mock that the Date prototype exposes
var unimplementedMethods = ['getUTCDay',
'getYear', 'setDate', 'setFullYear', 'setHours', 'setMilliseconds',
'setMinutes', 'setMonth', 'setSeconds', 'setTime', 'setUTCDate', 'setUTCFullYear',
'setUTCHours', 'setUTCMilliseconds', 'setUTCMinutes', 'setUTCMonth', 'setUTCSeconds',
'setYear', 'toDateString', 'toGMTString', 'toJSON', 'toLocaleFormat', 'toLocaleString',
'toLocaleTimeString', 'toSource', 'toString', 'toTimeString', 'toUTCString', 'valueOf'];
angular.forEach(unimplementedMethods, function(methodName) {
self[methodName] = function() {
throw new Error("Method '" + methodName + "' is not implemented in the TzDate mock");
};
});
return self;
};
//make "tzDateInstance instanceof Date" return true
angular.mock.TzDate.prototype = Date.prototype;
})();
/* jshint +W101 */
angular.mock.animate = angular.module('mock.animate', ['ng'])
.config(['$provide', function($provide) {
$provide.decorator('$animate', function($delegate) {
var animate = {
queue : [],
enabled : $delegate.enabled,
flushNext : function(name) {
var tick = animate.queue.shift();
if (!tick) throw new Error('No animation to be flushed');
if(tick.method !== name) {
throw new Error('The next animation is not "' + name +
'", but is "' + tick.method + '"');
}
tick.fn();
return tick;
}
};
angular.forEach(['enter','leave','move','addClass','removeClass'], function(method) {
animate[method] = function() {
var params = arguments;
animate.queue.push({
method : method,
params : params,
element : angular.isElement(params[0]) && params[0],
parent : angular.isElement(params[1]) && params[1],
after : angular.isElement(params[2]) && params[2],
fn : function() {
$delegate[method].apply($delegate, params);
}
});
};
});
return animate;
});
}]);
/**
* @ngdoc function
* @name angular.mock.dump
* @description
*
* *NOTE*: this is not an injectable instance, just a globally available function.
*
* Method for serializing common angular objects (scope, elements, etc..) into strings, useful for
* debugging.
*
* This method is also available on window, where it can be used to display objects on debug
* console.
*
* @param {*} object - any object to turn into string.
* @return {string} a serialized string of the argument
*/
angular.mock.dump = function(object) {
return serialize(object);
function serialize(object) {
var out;
if (angular.isElement(object)) {
object = angular.element(object);
out = angular.element('<div></div>');
angular.forEach(object, function(element) {
out.append(angular.element(element).clone());
});
out = out.html();
} else if (angular.isArray(object)) {
out = [];
angular.forEach(object, function(o) {
out.push(serialize(o));
});
out = '[ ' + out.join(', ') + ' ]';
} else if (angular.isObject(object)) {
if (angular.isFunction(object.$eval) && angular.isFunction(object.$apply)) {
out = serializeScope(object);
} else if (object instanceof Error) {
out = object.stack || ('' + object.name + ': ' + object.message);
} else {
// TODO(i): this prevents methods being logged,
// we should have a better way to serialize objects
out = angular.toJson(object, true);
}
} else {
out = String(object);
}
return out;
}
function serializeScope(scope, offset) {
offset = offset || ' ';
var log = [offset + 'Scope(' + scope.$id + '): {'];
for ( var key in scope ) {
if (Object.prototype.hasOwnProperty.call(scope, key) && !key.match(/^(\$|this)/)) {
log.push(' ' + key + ': ' + angular.toJson(scope[key]));
}
}
var child = scope.$$childHead;
while(child) {
log.push(serializeScope(child, offset + ' '));
child = child.$$nextSibling;
}
log.push('}');
return log.join('\n' + offset);
}
};
/**
* @ngdoc object
* @name ngMock.$httpBackend
* @description
* Fake HTTP backend implementation suitable for unit testing applications that use the
* {@link ng.$http $http service}.
*
* *Note*: For fake HTTP backend implementation suitable for end-to-end testing or backend-less
* development please see {@link ngMockE2E.$httpBackend e2e $httpBackend mock}.
*
* During unit testing, we want our unit tests to run quickly and have no external dependencies so
* we don’t want to send {@link https://developer.mozilla.org/en/xmlhttprequest XHR} or
* {@link http://en.wikipedia.org/wiki/JSONP JSONP} requests to a real server. All we really need is
* to verify whether a certain request has been sent or not, or alternatively just let the
* application make requests, respond with pre-trained responses and assert that the end result is
* what we expect it to be.
*
* This mock implementation can be used to respond with static or dynamic responses via the
* `expect` and `when` apis and their shortcuts (`expectGET`, `whenPOST`, etc).
*
* When an Angular application needs some data from a server, it calls the $http service, which
* sends the request to a real server using $httpBackend service. With dependency injection, it is
* easy to inject $httpBackend mock (which has the same API as $httpBackend) and use it to verify
* the requests and respond with some testing data without sending a request to real server.
*
* There are two ways to specify what test data should be returned as http responses by the mock
* backend when the code under test makes http requests:
*
* - `$httpBackend.expect` - specifies a request expectation
* - `$httpBackend.when` - specifies a backend definition
*
*
* # Request Expectations vs Backend Definitions
*
* Request expectations provide a way to make assertions about requests made by the application and
* to define responses for those requests. The test will fail if the expected requests are not made
* or they are made in the wrong order.
*
* Backend definitions allow you to define a fake backend for your application which doesn't assert
* if a particular request was made or not, it just returns a trained response if a request is made.
* The test will pass whether or not the request gets made during testing.
*
*
* <table class="table">
* <tr><th width="220px"></th><th>Request expectations</th><th>Backend definitions</th></tr>
* <tr>
* <th>Syntax</th>
* <td>.expect(...).respond(...)</td>
* <td>.when(...).respond(...)</td>
* </tr>
* <tr>
* <th>Typical usage</th>
* <td>strict unit tests</td>
* <td>loose (black-box) unit testing</td>
* </tr>
* <tr>
* <th>Fulfills multiple requests</th>
* <td>NO</td>
* <td>YES</td>
* </tr>
* <tr>
* <th>Order of requests matters</th>
* <td>YES</td>
* <td>NO</td>
* </tr>
* <tr>
* <th>Request required</th>
* <td>YES</td>
* <td>NO</td>
* </tr>
* <tr>
* <th>Response required</th>
* <td>optional (see below)</td>
* <td>YES</td>
* </tr>
* </table>
*
* In cases where both backend definitions and request expectations are specified during unit
* testing, the request expectations are evaluated first.
*
* If a request expectation has no response specified, the algorithm will search your backend
* definitions for an appropriate response.
*
* If a request didn't match any expectation or if the expectation doesn't have the response
* defined, the backend definitions are evaluated in sequential order to see if any of them match
* the request. The response from the first matched definition is returned.
*
*
* # Flushing HTTP requests
*
* The $httpBackend used in production, always responds to requests with responses asynchronously.
* If we preserved this behavior in unit testing, we'd have to create async unit tests, which are
* hard to write, follow and maintain. At the same time the testing mock, can't respond
* synchronously because that would change the execution of the code under test. For this reason the
* mock $httpBackend has a `flush()` method, which allows the test to explicitly flush pending
* requests and thus preserving the async api of the backend, while allowing the test to execute
* synchronously.
*
*
* # Unit testing with mock $httpBackend
* The following code shows how to setup and use the mock backend in unit testing a controller.
* First we create the controller under test
*
<pre>
// The controller code
function MyController($scope, $http) {
var authToken;
$http.get('/auth.py').success(function(data, status, headers) {
authToken = headers('A-Token');
$scope.user = data;
});
$scope.saveMessage = function(message) {
var headers = { 'Authorization': authToken };
$scope.status = 'Saving...';
$http.post('/add-msg.py', message, { headers: headers } ).success(function(response) {
$scope.status = '';
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