add toBeApproximately

khoama · Nov 21, 2014 · f446af1 · f446af1
1 parent 16827d4
commit f446af1
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/test/helpers/matchers.coffee b/test/helpers/matchers.coffee
@@ -60,5 +60,15 @@ beforeEach( ->
           return { message: message, pass: pass }
       }
 
+    toBeApproximately: ->
+      return {
+        compare: (actual, expected, tolerance) ->
+          pass = Math.abs(actual - expected) <= tolerance
+          return {
+            pass: pass
+            message: "#{actual} is #{if pass then '' else 'not'} approximately #{expected}"
+          }
+      }
+
   jasmine.addMatchers(matchers)
 )