Remove unnecessary TestCask references

test/Casks/compliance_test.rb

@@ -1,7 +1,7 @@
 require 'test_helper'
 
 describe "Casks" do
-  Cask.all.reject {|c| c.is_a?(TestCask) }.each do |cask|
+  Cask.all.each do |cask|
     describe "#{cask}" do
       it "passes audit" do
         audit = Cask::Audit.new(cask)

test/test_helper.rb

@@ -33,6 +33,3 @@ FileUtils.mkdir_p taps_dest
 HOMEBREW_PREFIX.join('bin').mkdir
 
 FileUtils.ln_s project_root, taps_dest/"homebrew-cask"
-
-# Common superclass for tests casks for when we need to filter them out
-class TestCask < Cask; end