add infinity test for #1177

Changelog.md

@@ -9,6 +9,7 @@
 * Do not allow pie slices to overlap pie labels, by Michael Dougherty ([#664](https://github.com/dc-js/dc.js/issues/664) / [#1167](https://github.com/dc-js/dc.js/pull/1167))
 * Highlight pie slices when hovering labels and paths. (addressing a concern raised in commit [0a35ef61](https://github.com/dc-js/dc.js/pull/1167/commits/0a35ef61568baf8e84e0bc489f678df560dc7f31) in PR [#1167](https://github.com/dc-js/dc.js/pull/1167), but in a more robust way)
 * Transition dots in line chart, by Paul Mach ([#1181](https://github.com/dc-js/dc.js/pull/1181))
+* Number display was getting stuck on Infinity, by Xaser Acheron ([#1176](https://github.com/dc-js/dc.js/issues/1176) / [#1177](https://github.com/dc-js/dc.js/pull/1177))
 
 ## 2.0.0 beta 31
 * Brush was sometimes not displaying, fix by Paul Briton ([#1134](https://github.com/dc-js/dc.js/issues/1134))

spec/number-display-spec.js

@@ -165,4 +165,30 @@ describe('dc.numberDisplay', function () {
             d3.select('#number-display-test-section').remove();
         });
     });
+    describe('Infinity', function () {
+        var chart;
+        beforeEach(function () {
+            var id = 'empty-div';
+            appendChartID(id);
+            chart = buildChart('#' + id);
+            chart.valueAccessor(function (x) { return x; })
+                .group({value: function () { return Infinity; }})
+                .formatNumber(function (d) { return d; })
+                .render();
+            d3.timer.flush();
+        });
+        it('should display as Infinity', function () {
+            expect(chart.root().text()).toEqual('Infinity');
+        });
+        describe('returning to finite', function () {
+            beforeEach(function () {
+                chart.group({value: function () { return 17; }})
+                    .render();
+                d3.timer.flush();
+            });
+            it('should display finite', function () {
+                expect(chart.root().text()).toEqual('17');
+            });
+        });
+    });
 });