Add spec for aliasing $@

library/English/alias_spec.rb

@@ -1,8 +1,14 @@
 require_relative '../../spec_helper'
 require 'English'
 
-describe "alias keyword" do
-  it "aliases $ERROR_INFO to $! in English and $ERROR_INFO still returns a backtrace" do
-    (1 / 0 rescue $ERROR_INFO).should_not == nil
+describe "English" do
+  it "aliases $! to $ERROR_INFO and $ERROR_INFO still returns an Exception with a backtrace" do
+    exception = (1 / 0 rescue $ERROR_INFO)
+    exception.should be_kind_of(Exception)
+    exception.backtrace.should be_kind_of(Array)
+  end
+
+  it "aliases $@ to $ERROR_POSITION and $ERROR_POSITION still returns a backtrace" do
+    (1 / 0 rescue $ERROR_POSITION).should be_kind_of(Array)
   end
 end