diff --git a/test/helper.rb b/test/helper.rb
index c256da6..e4b9123 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -1,6 +1,7 @@
 require 'test/unit'
 require 'rubygems'
 require 'shoulda'
+require 'quietbacktrace'
 require 'mocha'
 require File.join(File.dirname(__FILE__),'boot') unless defined?(ActiveRecord)
 require 'grouped_scope'
@@ -9,55 +10,65 @@
 ActiveRecord::Base.colorize_logging = false
 ActiveRecord::Base.establish_connection :adapter => 'sqlite3', :database => ':memory:'
 
-def setup_environment(options={})
-  options.reverse_merge! :group_column => :group_id
-  setup_database(options)
-  setup_models(options)
-end
-
-def setup_database(options)
-  ActiveRecord::Base.connection.create_table :employees, :force => true do |t|
-    t.column :name,         :string
-    t.column :email,        :string
-    t.column options[:group_column],  :integer
-  end
-  ActiveRecord::Base.connection.create_table :reports, :force => true do |t|
-    t.column :title,        :string
-    t.column :body,         :string
-    t.column :employee_id,  :integer
+class Test::Unit::TestCase
+  
+  self.new_backtrace_silencer(:shoulda) { |line| line.include? 'lib/shoulda' }
+  self.new_backtrace_silencer(:mocha) { |line| line.include? 'lib/mocha' }
+  self.backtrace_silencers << :shoulda << :mocha
+  
+  def setup_environment(options={})
+    options.reverse_merge! :group_column => :group_id
+    setup_database(options)
+    setup_models(options)
   end
-  ActiveRecord::Base.connection.create_table :legacy_employees, :force => true, :id => false do |t|
-    t.column :name,         :string
-    t.column :email,        :string
-    t.column options[:group_column],  :integer
+  
+  protected
+  
+  def setup_database(options)
+    ActiveRecord::Base.connection.create_table :employees, :force => true do |t|
+      t.column :name,         :string
+      t.column :email,        :string
+      t.column options[:group_column],  :integer
+    end
+    ActiveRecord::Base.connection.create_table :reports, :force => true do |t|
+      t.column :title,        :string
+      t.column :body,         :string
+      t.column :employee_id,  :integer
+    end
+    ActiveRecord::Base.connection.create_table :legacy_employees, :force => true, :id => false do |t|
+      t.column :name,         :string
+      t.column :email,        :string
+      t.column options[:group_column],  :integer
+    end
+    ActiveRecord::Base.connection.create_table :legacy_reports, :force => true do |t|
+      t.column :title,        :string
+      t.column :body,         :string
+      t.column :email,        :string
+    end
   end
-  ActiveRecord::Base.connection.create_table :legacy_reports, :force => true do |t|
-    t.column :title,        :string
-    t.column :body,         :string
-    t.column :email,        :string
+  
+  def setup_models(options)
+    ['Employee','Report','LegacyEmployee','LegacyReport'].each do |klass|
+      Object.send(:remove_const,klass) rescue nil
+      Object.const_set klass, Class.new(ActiveRecord::Base)
+    end
+    Employee.class_eval do
+      has_many :reports
+      grouped_scope :reports
+    end
+    Report.class_eval do
+      belongs_to :employee
+    end
+    LegacyEmployee.class_eval do
+      set_primary_key :email
+      has_many :reports, :class_name => 'LegacyReport', :foreign_key => 'email'
+      grouped_scope :reports
+    end
+    LegacyReport.class_eval do
+      belongs_to :employee, :class_name => 'LegacyEmployee'
+    end
   end
+  
+  
 end
 
-def setup_models(options)
-  ['Employee','Report','LegacyEmployee','LegacyReport'].each do |klass|
-    Object.send(:remove_const,klass) rescue nil
-    Object.const_set klass, Class.new(ActiveRecord::Base)
-  end
-  Employee.class_eval do
-    has_many :reports
-    grouped_scope :reports
-  end
-  Report.class_eval do
-    belongs_to :employee
-  end
-  LegacyEmployee.class_eval do
-    set_primary_key :email
-    has_many :reports, :class_name => 'LegacyReport', :foreign_key => 'email'
-    grouped_scope :reports
-  end
-  LegacyReport.class_eval do
-    belongs_to :employee, :class_name => 'LegacyEmployee'
-  end
-end
-
-