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                return this.callIds[this.callCount - 1] > spyFn.callIds[spyFn.callCount - 1];
            },

            withArgs: function () {
                var args = slice.call(arguments);

                if (this.fakes) {
                    var match = matchingFake(this.fakes, args, true);

                    if (match) {
                        return match;
                    }
                } else {
                    this.fakes = [];
                }

                var original = this;
                var fake = this._create();
                fake.matchingAguments = args;
                push.call(this.fakes, fake);

                fake.withArgs = function () {
                    return original.withArgs.apply(original, arguments);
                };

                for (var i = 0; i < this.args.length; i++) {
                    if (fake.matches(this.args[i])) {
                        incrementCallCount.call(fake);
                        push.call(fake.thisValues, this.thisValues[i]);
                        push.call(fake.args, this.args[i]);
                        push.call(fake.returnValues, this.returnValues[i]);
                        push.call(fake.exceptions, this.exceptions[i]);
                        push.call(fake.callIds, this.callIds[i]);
                    }
                }
                createCallProperties.call(fake);

                return fake;
            },

            matches: function (args, strict) {
                var margs = this.matchingAguments;

                if (margs.length <= args.length &&
                    sinon.deepEqual(margs, args.slice(0, margs.length))) {
                    return !strict || margs.length == args.length;
                }
            },

            printf: function (format) {
                var spy = this;
                var args = slice.call(arguments, 1);
                var formatter;

                return (format || "").replace(/%(.)/g, function (match, specifyer) {
                    formatter = spyApi.formatters[specifyer];

                    if (typeof formatter == "function") {
                        return formatter.call(null, spy, args);
                    } else if (!isNaN(parseInt(specifyer), 10)) {
                        return sinon.format(args[specifyer - 1]);
                    }

                    return "%" + specifyer;
                });
            }
        };

        delegateToCalls(spyApi, "calledOn", true);
        delegateToCalls(spyApi, "alwaysCalledOn", false, "calledOn");
        delegateToCalls(spyApi, "calledWith", true);
        delegateToCalls(spyApi, "calledWithMatch", true);
        delegateToCalls(spyApi, "alwaysCalledWith", false, "calledWith");
        delegateToCalls(spyApi, "alwaysCalledWithMatch", false, "calledWithMatch");
        delegateToCalls(spyApi, "calledWithExactly", true);
        delegateToCalls(spyApi, "alwaysCalledWithExactly", false, "calledWithExactly");
        delegateToCalls(spyApi, "neverCalledWith", false, "notCalledWith",
            function () { return true; });
        delegateToCalls(spyApi, "neverCalledWithMatch", false, "notCalledWithMatch",
            function () { return true; });
        delegateToCalls(spyApi, "threw", true);
        delegateToCalls(spyApi, "alwaysThrew", false, "threw");
        delegateToCalls(spyApi, "returned", true);
        delegateToCalls(spyApi, "alwaysReturned", false, "returned");
        delegateToCalls(spyApi, "calledWithNew", true);
        delegateToCalls(spyApi, "alwaysCalledWithNew", false, "calledWithNew");
        delegateToCalls(spyApi, "callArg", false, "callArgWith", function () {
            throw new Error(this.toString() + " cannot call arg since it was not yet invoked.");
        });
        spyApi.callArgWith = spyApi.callArg;
        delegateToCalls(spyApi, "callArgOn", false, "callArgOnWith", function () {
            throw new Error(this.toString() + " cannot call arg since it was not yet invoked.");
        });
        spyApi.callArgOnWith = spyApi.callArgOn;
        delegateToCalls(spyApi, "yield", false, "yield", function () {
            throw new Error(this.toString() + " cannot yield since it was not yet invoked.");
        });
        // "invokeCallback" is an alias for "yield" since "yield" is invalid in strict mode.
        spyApi.invokeCallback = spyApi.yield;
        delegateToCalls(spyApi, "yieldOn", false, "yieldOn", function () {
            throw new Error(this.toString() + " cannot yield since it was not yet invoked.");
        });
        delegateToCalls(spyApi, "yieldTo", false, "yieldTo", function (property) {
            throw new Error(this.toString() + " cannot yield to '" + property +
                "' since it was not yet invoked.");
        });
        delegateToCalls(spyApi, "yieldToOn", false, "yieldToOn", function (property) {
            throw new Error(this.toString() + " cannot yield to '" + property +
                "' since it was not yet invoked.");
        });

        spyApi.formatters = {
            "c": function (spy) {
                return sinon.timesInWords(spy.callCount);
            },

            "n": function (spy) {
                return spy.toString();
            },