Fix element positioning

spec/javascript/models/section-element_test.coffee

@@ -0,0 +1,9 @@
+moduleForModel 'section-element', 'Section element model',
+  needs: ['model:section', 'model:table']
+
+test "box_size", ->
+  element = @subject
+    box_width: 155
+    box_height: 310
+    dpm: 200
+  QUnit.close element.get('box_size'), 1.733, 0.01

spec/javascript/test_helper.coffee

@@ -2,6 +2,7 @@
 #= require supplier/app/application
 #= require require
 #= require qunit
+#= require qunit/qunit-close-enough
 #= require ember-qunit/ember-qunit
 #= require_self
 #= require_tree ./components