can/util/array/diff_test.js

MIT-licensed, client-side, JavaScript framework that makes building rich web applications easy.

steal('can/util/array/diff.js', 'can/test', 'steal-qunit', function (diff) {

	QUnit.test("diff", function(){
		
		var patches = diff([], [1,2,3]);
		deepEqual(patches, [{
			index: 0,
			deleteCount: 0,
			insert: [1,2,3]
		}], "insert many at end");
		
		patches = diff([1,2,3], [1,2,3]);
		deepEqual(patches,[],"no changes");
		
		patches = diff([1,2,3],[1,2,3,4]);
		deepEqual(patches, [{
			index: 3,
			deleteCount: 0,
			insert: [4]
		}],"add one at the end");
		
		patches = diff([1,2,3,4], [1,2,4]);
		
		deepEqual(patches, [{
			index: 2,
			deleteCount: 1,
			insert: []
		}],"remove one in the middle");
		
		patches = diff(["a","b","z","f","x"],["a","b","f","w","z"]);
		deepEqual(patches, [{
			index: 2,
			insert: [],
			deleteCount: 1
		},{
			index: 3,
			deleteCount: 1,
			insert: ["w","z"]
		}]);
		
		patches = diff(["a","b","b"],["c","a","b"]);
		deepEqual(patches, [{
			index: 0,
			insert: ["c"],
			deleteCount: 0
		},{
			index: 3,
			deleteCount: 1,
			insert: []
		}]);
		
		// a, b, c, d, e, f, g
		// a, c, d, e, f, g
		// a, c, e, f, g
		// a, c, e, g
		patches = diff(["a","b","c","d","e","f","g"],["a","c","e","g"]);
		deepEqual(patches, [{
			index: 1,
			insert: [],
			deleteCount: 1
		},{
			index: 2,
			deleteCount: 1,
			insert: []
		},
		{
			index: 3,
			deleteCount: 1,
			insert: []
		}]);
		
	});

});