1 files changed, 12 insertions, 2 deletions
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 740577ba7..2a9e4e704 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -26,6 +26,7 @@ class Formula
     set_instance_variable :bottle
     set_instance_variable :devel
     set_instance_variable :head
+    set_instance_variable :test
 
     @name = name
     validate_variable :name
@@ -590,12 +591,16 @@ public
     ret = nil
     mktemp do
       @testpath = Pathname.pwd
-      ret = instance_eval(&self.class.test)
+      ret = instance_eval(&@test)
       @testpath = nil
     end
     ret
   end
 
+  def test_defined?
+    not @test.nil?
+  end
+
 private
 
   def stage
@@ -642,7 +647,12 @@ private
   end
 
   def self.method_added method
-    raise 'You cannot override Formula.brew' if method == :brew
+    case method
+    when :brew
+      raise "You cannot override Formula#brew"
+    when :test
+      @test = method
+    end
   end
 
   class << self