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gaia/apps/costcontrol/test/unit/mock_date.js

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+/* exported MockDateFactory */
+
+'use strict';
+
+/*
+ * To construct a Date mockup specifying what date to return for "now / today".
+ *
+ * Use it by replacing Date constructor with that returned by the factory:
+ *   window.Date = new MockDateFactory(new window.Date(2012, 0, 1));
+ *
+ * Subsequents uses of `new Date()` will return January, 1st 2012. Real Date
+ * constructor is kept safe in `MockDateFactory.realDate`.
+ */
+var MockDateFactory = (function(realDate) {
+
+  function buildFakeDateConstructor(now) {
+    function FakeDate(year, month, day) {
+      if (this instanceof FakeDate) {
+        if (arguments.length === 1) {
+          return new realDate(year);
+        } else if (arguments.length === 3) {
+          return new realDate(year, month, day);
+        } else if (typeof now !== 'undefined') {
+          return new realDate(now);
+        } else {
+          return new realDate();
+        }
+
+      } else {
+        return realDate.apply(this, arguments);
+      }
+    }
+
+    FakeDate.prototype.toUTCString = function() {
+      return realDate.prototype.toUTCString.apply(this, arguments);
+    };
+
+    return FakeDate;
+  }
+  buildFakeDateConstructor.realDate = realDate;
+
+  return buildFakeDateConstructor;
+
+}(window.Date));