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behavior.js
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behavior.js
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"use strict";
var extend = require("./util/core/extend");
var functionName = require("./util/core/function-name");
var valueToString = require("./util/core/value-to-string");
var slice = Array.prototype.slice;
var join = Array.prototype.join;
var useLeftMostCallback = -1;
var useRightMostCallback = -2;
var nextTick = (function () {
if (typeof process === "object" && typeof process.nextTick === "function") {
return process.nextTick;
}
if (typeof setImmediate === "function") {
return setImmediate;
}
return function (callback) {
setTimeout(callback, 0);
};
})();
function getCallback(behavior, args) {
var callArgAt = behavior.callArgAt;
if (callArgAt >= 0) {
return args[callArgAt];
}
var argumentList;
if (callArgAt === useLeftMostCallback) {
argumentList = args;
}
if (callArgAt === useRightMostCallback) {
argumentList = slice.call(args).reverse();
}
var callArgProp = behavior.callArgProp;
for (var i = 0, l = argumentList.length; i < l; ++i) {
if (!callArgProp && typeof argumentList[i] === "function") {
return argumentList[i];
}
if (callArgProp && argumentList[i] &&
typeof argumentList[i][callArgProp] === "function") {
return argumentList[i][callArgProp];
}
}
return null;
}
function getCallbackError(behavior, func, args) {
if (behavior.callArgAt < 0) {
var msg;
if (behavior.callArgProp) {
msg = functionName(behavior.stub) +
" expected to yield to '" + valueToString(behavior.callArgProp) +
"', but no object with such a property was passed.";
} else {
msg = functionName(behavior.stub) +
" expected to yield, but no callback was passed.";
}
if (args.length > 0) {
msg += " Received [" + join.call(args, ", ") + "]";
}
return msg;
}
return "argument at index " + behavior.callArgAt + " is not a function: " + func;
}
function callCallback(behavior, args) {
if (typeof behavior.callArgAt === "number") {
var func = getCallback(behavior, args);
if (typeof func !== "function") {
throw new TypeError(getCallbackError(behavior, func, args));
}
if (behavior.callbackAsync) {
nextTick(function () {
func.apply(behavior.callbackContext, behavior.callbackArguments);
});
} else {
func.apply(behavior.callbackContext, behavior.callbackArguments);
}
}
}
var proto = {
create: function create(stub) {
var behavior = extend({}, proto);
delete behavior.create;
delete behavior.addBehavior;
delete behavior.createBehavior;
behavior.stub = stub;
return behavior;
},
isPresent: function isPresent() {
return (typeof this.callArgAt === "number" ||
this.exception ||
typeof this.returnArgAt === "number" ||
this.returnThis ||
this.fakeFn ||
this.returnValueDefined);
},
invoke: function invoke(context, args) {
callCallback(this, args);
if (this.exception) {
throw this.exception;
} else if (typeof this.returnArgAt === "number") {
return args[this.returnArgAt];
} else if (this.returnThis) {
return context;
} else if (this.fakeFn) {
return this.fakeFn.apply(context, args);
} else if (this.resolve) {
return (this.promiseLibrary || Promise).resolve(this.returnValue);
} else if (this.reject) {
return (this.promiseLibrary || Promise).reject(this.returnValue);
} else if (this.callsThrough) {
return this.stub.wrappedMethod.apply(context, args);
}
return this.returnValue;
},
onCall: function onCall(index) {
return this.stub.onCall(index);
},
onFirstCall: function onFirstCall() {
return this.stub.onFirstCall();
},
onSecondCall: function onSecondCall() {
return this.stub.onSecondCall();
},
onThirdCall: function onThirdCall() {
return this.stub.onThirdCall();
},
withArgs: function withArgs(/* arguments */) {
throw new Error(
"Defining a stub by invoking \"stub.onCall(...).withArgs(...)\" " +
"is not supported. Use \"stub.withArgs(...).onCall(...)\" " +
"to define sequential behavior for calls with certain arguments."
);
}
};
function createAsyncVersion(syncFnName) {
return function () {
var result = this[syncFnName].apply(this, arguments);
this.callbackAsync = true;
return result;
};
}
// create asynchronous versions of callsArg* and yields* methods
Object.keys(proto).forEach(function (method) {
// need to avoid creating anotherasync versions of the newly added async methods
if (method.match(/^(callsArg|yields)/) && !method.match(/Async/)) {
proto[method + "Async"] = createAsyncVersion(method);
}
});
function createBehavior(behaviorMethod) {
return function () {
this.defaultBehavior = this.defaultBehavior || proto.create(this);
this.defaultBehavior[behaviorMethod].apply(this.defaultBehavior, arguments);
return this;
};
}
function addBehavior(stub, name, fn) {
proto[name] = function () {
fn.apply(this, [this].concat([].slice.call(arguments)));
return this.stub || this;
};
stub[name] = createBehavior(name);
}
proto.addBehavior = addBehavior;
proto.createBehavior = createBehavior;
module.exports = proto;