QUnit.specify("postal.js", function(){
    describe("DistinctPredicate", function(){
        describe("When calling the function with the same data multiple times", function() {
            var pred = new DistinctPredicate(),
                data = { name: "Dr Who" },
                results = [];
            results.push(pred(data));
            results.push(pred(data));
            results.push(pred(data));

            it("The first result should be true", function(){
                assert(results[0]).isTrue();
            });
            it("The second result should be false", function(){
                assert(results[1]).isFalse();
            });
            it("The third result should be false", function(){
                assert(results[2]).isFalse();
            });
        });
        describe("When calling the function with different data every time", function() {
            var predA = new DistinctPredicate(),
                data = { name: "Amelia" },
                res = [];
            res.push(predA(data));
            data.name = "Rose";
            res.push(predA(data));
            data.name = "Martha";
            res.push(predA(data));

            it("The first result should be true", function(){
                assert(res[0]).isTrue();
            });
            it("The second result should be true", function(){
                assert(res[1]).isTrue();
            });
            it("The third result should be true", function(){
                assert(res[2]).isTrue();
            });
        });
        describe("When calling the function with different data every two calls", function() {
            var predA = new DistinctPredicate(),
                data = { name: "Amelia" },
                res = [];
            res.push(predA(data));
            res.push(predA(data));
            data.name = "Rose";
            res.push(predA(data));
            res.push(predA(data));
            data.name = "Martha";
            res.push(predA(data));
            res.push(predA(data));

            it("The first result should be true", function(){
                assert(res[0]).isTrue();
            });
            it("The second result should be false", function(){
                assert(res[1]).isFalse();
            });

            it("The third result should be isTrue", function(){
                assert(res[2]).isTrue();
            });
            it("The fourth result should be false", function(){
                assert(res[3]).isFalse();
            });

            it("The fifth result should be true", function(){
                assert(res[4]).isTrue();
            });
            it("The sixth result should be false", function(){
                assert(res[5]).isFalse();
            });
        });
    });
});