postal.js/spec/DistinctPredicate.spec.js

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();
			});
		});
	});
});