Add a js spec for admin/report model, and find a bug too

app/assets/javascripts/admin/models/report.js

@@ -16,8 +16,8 @@ Discourse.Report = Discourse.Model.extend({
 
   sumDays: function(startDaysAgo, endDaysAgo) {
     if (this.data) {
-      var earliestDate = Date.create(endDaysAgo + ' days ago', 'en');
-      var latestDate = Date.create(startDaysAgo + ' days ago', 'en');
+      var earliestDate = Date.create(endDaysAgo + ' days ago', 'en').beginningOfDay();
+      var latestDate = Date.create(startDaysAgo + ' days ago', 'en').beginningOfDay();
       var d, sum = 0;
       this.data.each(function(datum){
         d = Date.create(datum.x);

spec/javascripts/models/report_spec.js

@@ -0,0 +1,41 @@
+/*global waitsFor:true expect:true describe:true beforeEach:true it:true */
+
+describe("Discourse.Report", function() {
+
+  function dateString(arg) {
+    return Date.create(arg, 'en').format('{yyyy}-{MM}-{dd}');
+  }
+
+  function reportWithData(data) {
+    var arr = [];
+    data.each(function(val, index) {
+      arr.push({x: dateString(index + ' days ago'), y: val});
+    });
+    return Discourse.Report.create({ type: 'topics', data: arr });
+  }
+
+  describe("todayCount", function() {
+    it("displays the correct value", function() {
+      expect( reportWithData([5,4,3,2,1]).get('todayCount') ).toBe(5);
+    });
+  });
+
+  describe("yesterdayCount", function() {
+    it("displays the correct value", function() {
+      expect( reportWithData([5,4,3,2,1]).get('yesterdayCount') ).toBe(4);
+    });
+  });
+
+  describe("sumDays", function() {
+    it("adds the values for the given range of days, inclusive", function() {
+      expect( reportWithData([1,2,3,5,8,13]).sumDays(2,4) ).toBe(16);
+    });
+  });
+
+  describe("lastSevenDaysCount", function() {
+    it("displays the correct value", function() {
+      expect( reportWithData([100,9,8,7,6,5,4,3,200,300,400]).get('lastSevenDaysCount') ).toBe(42);
+    });
+  });
+
+});

spec/javascripts/spec.js

@@ -39,6 +39,7 @@
 //= require_tree ../../app/assets/javascripts/discourse/helpers
 //= require_tree ../../app/assets/javascripts/discourse/templates
 //= require_tree ../../app/assets/javascripts/discourse/routes
+//= require_tree ../../app/assets/javascripts/admin/models
 
 //= require_tree ../../app/assets/javascripts/defer