add test for date filtering failure

spec/filter-dates-spec.js

@@ -0,0 +1,91 @@
+describe('dc.filter-dates', function() {
+    // do date filters work correctly?
+    // adapted from a fiddle demonstrating the problem by Matt Traynham
+    // see it fail with 1.7.1: http://jsfiddle.net/gordonwoodhull/Q2H9C/4/
+    // see it win with 2.0: http://jsfiddle.net/gordonwoodhull/Q2H9C/3/
+    // (Thanks!!)
+
+    var group, dateDim1, dateDim2, group1, group2,
+        row1, row2;
+    var width = 400;
+    var height = 200;
+    var margins = {top: 15, right: 10, bottom: 20, left: 40};
+    beforeEach(function () {
+        // Months are 0 indexed...
+        var start = new Date(2013, 10, 1);
+        var end = new Date(2013, 11, 1);
+        var stringLength = 2;
+
+        // Generate Random Data [Date, VowelString, Random Number, Random Measure]
+        var data = [];
+        for(var i = 0; i < 2000; i++) {
+            data[i] = [
+                randomDate(start, end),
+                randomVowelString(stringLength),
+                Math.floor(Math.random() * 20),
+                Math.floor(Math.random() * 30000)
+            ];
+        }
+
+        var ndx = crossfilter(data);
+        dateDim1 = ndx.dimension(function(d) { return d[0]; });
+        dateDim2 = ndx.dimension(function(d) { return d[0]; });
+
+        group1 = dateDim1.group().reduceSum(function(d) { return d[3]; });
+        group2 = dateDim2.group().reduceSum(function(d) { return d[3]; });
+
+        appendChartID(row1);
+        appendChartID(row2);
+
+        row1 = dc.rowChart("row1")
+            .width(width)
+            .height(height)
+            .margins(margins)
+            .dimension(dateDim1)
+            .group(group1)
+            .gap(1)
+            .render();
+
+        row2 = dc.rowChart("row2")
+            .width(width)
+            .height(height)
+            .margins(margins)
+            .dimension(dateDim2)
+            .group(group2)
+            .gap(1)
+            .render();
+    });
+
+    it('filtering on 11/8 should keep only that row', function() {
+        row1.filter(new Date(2013, 10, 8));
+        expect(group1.all()[6].value).not.toEqual(0);
+        expect(group2.all()[6].value).toEqual(0);
+        expect(group2.all()[7]).toEqual(group1.all()[7]);
+        expect(group2.all()[8].value).toEqual(0);
+    });
+
+    it('filtering on 11/17 should keep only that row', function() {
+        row1.filter(new Date(2013, 10, 17));
+        expect(group1.all()[15].value).not.toEqual(0);
+        expect(group2.all()[15].value).toEqual(0);
+        expect(group2.all()[16]).toEqual(group1.all()[16]);
+        expect(group2.all()[17].value).toEqual(0);
+    });
+
+    // Create a Random Date
+    function randomDate(start, end) {
+        var d = new Date(start.getTime() + Math.random() * (end.getTime() - start.getTime()));
+        d.setHours(0,0,0,0);
+        return d;
+    }
+
+    // Create a Random String of vowels
+    var vowels = ["a","e","i","o","u","y"];
+    function randomVowelString(length) {
+        var val = "";
+        for(var i = 0; i < length; i++) {
+            val = val + vowels[Math.floor(Math.random() * (vowels.length - 1))];
+        }
+        return val;
+    }
+});