Put methods from spec/spec_helper in spec/support

There were a bunch of free-floating methods in spec_helper. They were
pulled over from test/helper, but they shouldn't be there. Move them
into appropriate modules in spec/support. This commit also cleans up the
"should_accept/reject_dummy_class methods in favor of using proper
matchers directly. This commit should probably not get squashed or git
will likely forget that those matcher specs are the same file because of
how much changed.

spec/paperclip/matchers/validate_attachment_content_type_matcher_spec.rb

@@ -4,111 +4,96 @@ require 'paperclip/matchers'
 describe Paperclip::Shoulda::Matchers::ValidateAttachmentContentTypeMatcher do
 describe Paperclip::Shoulda::Matchers::ValidateAttachmentContentTypeMatcher do
   extend Paperclip::Shoulda::Matchers
   extend Paperclip::Shoulda::Matchers
 
 
-  context "validate_attachment_content_type" do
-    before do
-      reset_table("dummies") do |d|
-        d.string :title
-        d.string :avatar_file_name
-        d.string :avatar_content_type
-      end
-      reset_class "Dummy"
-      Dummy.do_not_validate_attachment_file_type :avatar
-      Dummy.has_attached_file :avatar
-      @matcher     = self.class.validate_attachment_content_type(:avatar).
-                       allowing(%w(image/png image/jpeg)).
-                       rejecting(%w(audio/mp3 application/octet-stream))
+  before do
+    reset_table("dummies") do |d|
+      d.string :title
+      d.string :avatar_file_name
+      d.string :avatar_content_type
     end
     end
+    reset_class "Dummy"
+    Dummy.do_not_validate_attachment_file_type :avatar
+    Dummy.has_attached_file :avatar
+  end
 
 
-    context "given a class with no validation" do
-      should_reject_dummy_class
-    end
+  it "rejects a class with no validation" do
+    expect(matcher).to_not accept(Dummy)
+  end
 
 
-    context "given a class with a validation that doesn't match" do
-      before do
-        Dummy.validates_attachment_content_type :avatar, content_type: %r{audio/.*}
-      end
+  it 'rejects a class when the validation fails' do
+    Dummy.validates_attachment_content_type :avatar, content_type: %r{audio/.*}
+    expect(matcher).to_not accept(Dummy)
+  end
 
 
-      should_reject_dummy_class
-    end
+  it "accepts a class with a matching validation" do
+    Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
+    expect(matcher).to accept(Dummy)
+  end
 
 
-    context "given a class with a matching validation" do
-      before do
-        Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
-      end
+  it "accepts a class with other validations but matching types" do
+    Dummy.validates_presence_of :title
+    Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
+    expect(matcher).to accept(Dummy)
+  end
 
 
-      should_accept_dummy_class
-    end
+  it "accepts a class that matches and a matcher that only specifies 'allowing'" do
+    Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
+    matcher = plain_matcher.allowing(%w(image/png image/jpeg))
 
 
-    context "given a class with other validations but matching types" do
-      before do
-        Dummy.validates_presence_of :title
-        Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
-      end
+    expect(matcher).to accept(Dummy)
+  end
 
 
-      should_accept_dummy_class
-    end
+  it "rejects a class that does not match and a matcher that only specifies 'allowing'" do
+    Dummy.validates_attachment_content_type :avatar, content_type: %r{audio/.*}
+    matcher = plain_matcher.allowing(%w(image/png image/jpeg))
 
 
-    context "given a class that matches and a matcher that only specifies 'allowing'" do
-      before do
-        Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
-        @matcher     = self.class.validate_attachment_content_type(:avatar).
-          allowing(%w(image/png image/jpeg))
-      end
+    expect(matcher).to_not accept(Dummy)
+  end
 
 
-      should_accept_dummy_class
-    end
+  it "accepts a class that matches and a matcher that only specifies 'rejecting'" do
+    Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
+    matcher = plain_matcher.rejecting(%w(audio/mp3 application/octet-stream))
 
 
-    context "given a class that does not match and a matcher that only specifies 'allowing'" do
-      before do
-        Dummy.validates_attachment_content_type :avatar, content_type: %r{audio/.*}
-        @matcher     = self.class.validate_attachment_content_type(:avatar).
-          allowing(%w(image/png image/jpeg))
-      end
+    expect(matcher).to accept(Dummy)
+  end
 
 
-      should_reject_dummy_class
-    end
+  it "rejects a class that does not match and a matcher that only specifies 'rejecting'" do
+    Dummy.validates_attachment_content_type :avatar, content_type: %r{audio/.*}
+    matcher = plain_matcher.rejecting(%w(audio/mp3 application/octet-stream))
 
 
-    context "given a class that matches and a matcher that only specifies 'rejecting'" do
-      before do
-        Dummy.validates_attachment_content_type :avatar, content_type: %r{image/.*}
-        @matcher     = self.class.validate_attachment_content_type(:avatar).
-          rejecting(%w(audio/mp3 application/octet-stream))
-      end
+    expect(matcher).to_not accept(Dummy)
+  end
 
 
-      should_accept_dummy_class
+  context "using an :if to control the validation" do
+    before do
+      Dummy.class_eval do
+        validates_attachment_content_type :avatar, content_type: %r{image/*} , if: :go
+        attr_accessor :go
+      end
     end
     end
 
 
-    context "given a class that does not match and a matcher that only specifies 'rejecting'" do
-      before do
-        Dummy.validates_attachment_content_type :avatar, content_type: %r{audio/.*}
-        @matcher     = self.class.validate_attachment_content_type(:avatar).
-          rejecting(%w(audio/mp3 application/octet-stream))
-      end
+    it "run the validation if the control is true" do
+      dummy = Dummy.new
+      dummy.go = true
+      expect(matcher).to accept(dummy)
+    end
 
 
-      should_reject_dummy_class
+    it "not run the validation if the control is false" do
+      dummy = Dummy.new
+      dummy.go = false
+      expect(matcher).to_not accept(dummy)
     end
     end
+  end
 
 
-    context "using an :if to control the validation" do
-      before do
-        Dummy.class_eval do
-          validates_attachment_content_type :avatar, content_type: %r{image/*} , if: :go
-          attr_accessor :go
-        end
-        @matcher = self.class.validate_attachment_content_type(:avatar).
-                        allowing(%w(image/png image/jpeg)).
-                        rejecting(%w(audio/mp3 application/octet-stream))
-        @dummy = Dummy.new
-      end
+  private
 
 
-      it "run the validation if the control is true" do
-        @dummy.go = true
-        expect(@matcher).to accept(@dummy)
-      end
+  def plain_matcher
+    self.class.validate_attachment_content_type(:avatar)
+  end
 
 
-      it "not run the validation if the control is false" do
-        @dummy.go = false
-        expect(@matcher).to_not accept(@dummy)
-      end
-    end
+  def matcher
+    plain_matcher.
+      allowing(%w(image/png image/jpeg)).
+      rejecting(%w(audio/mp3 application/octet-stream))
   end
   end
+
 end
 end

spec/paperclip/matchers/validate_attachment_presence_matcher_spec.rb

@@ -4,70 +4,66 @@ require 'paperclip/matchers'
 describe Paperclip::Shoulda::Matchers::ValidateAttachmentPresenceMatcher do
 describe Paperclip::Shoulda::Matchers::ValidateAttachmentPresenceMatcher do
   extend Paperclip::Shoulda::Matchers
   extend Paperclip::Shoulda::Matchers
 
 
-  context "validate_attachment_presence" do
-    before do
-      reset_table("dummies") do |d|
-        d.string :avatar_file_name
-      end
-      reset_class "Dummy"
-      Dummy.has_attached_file :avatar
-      Dummy.do_not_validate_attachment_file_type :avatar
-      @matcher     = self.class.validate_attachment_presence(:avatar)
+  before do
+    reset_table("dummies") do |d|
+      d.string :avatar_file_name
     end
     end
+    reset_class "Dummy"
+    Dummy.has_attached_file :avatar
+    Dummy.do_not_validate_attachment_file_type :avatar
+  end
 
 
-    context "given a class with no validation" do
-      should_reject_dummy_class
-    end
+  it "rejects a class with no validation" do
+    expect(matcher).to_not accept(Dummy)
+  end
 
 
-    context "given a class with a matching validation" do
-      before do
-        Dummy.validates_attachment_presence :avatar
-      end
+  it "accepts a class with a matching validation" do
+    Dummy.validates_attachment_presence :avatar
+    expect(matcher).to accept(Dummy)
+  end
 
 
-      should_accept_dummy_class
+  it "accepts an instance with other attachment validations" do
+    reset_table("dummies") do |d|
+      d.string :avatar_file_name
+      d.string :avatar_content_type
     end
     end
+    Dummy.class_eval do
+      validates_attachment_presence :avatar
+      validates_attachment_content_type :avatar, content_type: 'image/gif'
+    end
+    dummy = Dummy.new
 
 
-    context "given an instance with other attachment validations" do
-      before do
-        reset_table("dummies") do |d|
-          d.string :avatar_file_name
-          d.string :avatar_content_type
-        end
+    dummy.avatar = File.new fixture_file('5k.png')
 
 
-        Dummy.class_eval do
-          validates_attachment_presence :avatar
-          validates_attachment_content_type :avatar, content_type: 'image/gif'
-        end
+    expect(matcher).to accept(dummy)
+  end
 
 
-        @dummy = Dummy.new
-        @matcher = self.class.validate_attachment_presence(:avatar)
+  context "using an :if to control the validation" do
+    before do
+      Dummy.class_eval do
+        validates_attachment_presence :avatar, if: :go
+        attr_accessor :go
       end
       end
+    end
 
 
-      it "it should validate properly" do
-        @dummy.avatar = File.new fixture_file('5k.png')
-        expect(@matcher).to accept(@dummy)
-      end
+    it "runs the validation if the control is true" do
+      dummy = Dummy.new
+      dummy.avatar = nil
+      dummy.go = true
+      expect(matcher).to accept(dummy)
     end
     end
 
 
-    context "using an :if to control the validation" do
-      before do
-        Dummy.class_eval do
-          validates_attachment_presence :avatar, if: :go
-          attr_accessor :go
-        end
-        @dummy = Dummy.new
-        @dummy.avatar = nil
-      end
+    it "does not run the validation if the control is false" do
+      dummy = Dummy.new
+      dummy.avatar = nil
+      dummy.go = false
+      expect(matcher).to_not accept(dummy)
+    end
+  end
 
 
-      it "run the validation if the control is true" do
-        @dummy.go = true
-        expect(@matcher).to accept(@dummy)
-      end
+  private
 
 
-      it "not run the validation if the control is false" do
-        @dummy.go = false
-        expect(@matcher).to_not accept(@dummy)
-      end
-    end
+  def matcher
+    self.class.validate_attachment_presence(:avatar)
   end
   end
 end
 end

spec/paperclip/matchers/validate_attachment_size_matcher_spec.rb

@@ -4,91 +4,85 @@ require 'paperclip/matchers'
 describe Paperclip::Shoulda::Matchers::ValidateAttachmentSizeMatcher do
 describe Paperclip::Shoulda::Matchers::ValidateAttachmentSizeMatcher do
   extend Paperclip::Shoulda::Matchers
   extend Paperclip::Shoulda::Matchers
 
 
-  context "validate_attachment_size" do
-    before do
-      reset_table("dummies") do |d|
-        d.string :avatar_file_name
-        d.integer :avatar_file_size
-      end
-      reset_class "Dummy"
-      Dummy.do_not_validate_attachment_file_type :avatar
-      Dummy.has_attached_file :avatar
+  before do
+    reset_table("dummies") do |d|
+      d.string :avatar_file_name
+      d.integer :avatar_file_size
     end
     end
+    reset_class "Dummy"
+    Dummy.do_not_validate_attachment_file_type :avatar
+    Dummy.has_attached_file :avatar
+  end
 
 
-    context "of limited size" do
-      before do
-        @matcher = self.class.validate_attachment_size(:avatar).in(256..1024)
-      end
-
-      context "given a class with no validation" do
-        should_reject_dummy_class
-      end
+  context "Limiting size" do
+    it "rejects a class with no validation" do
+      expect(matcher.in(256..1024)).to_not accept(Dummy)
+    end
 
 
-      context "given a class with a validation that's too high" do
-        before { Dummy.validates_attachment_size :avatar, in: 256..2048 }
-        should_reject_dummy_class
-      end
+    it "rejects a class with a validation that's too high" do
+      Dummy.validates_attachment_size :avatar, in: 256..2048
+      expect(matcher.in(256..1024)).to_not accept(Dummy)
+    end
 
 
-      context "given a class with a validation that's too low" do
-        before { Dummy.validates_attachment_size :avatar, in: 0..1024 }
-        should_reject_dummy_class
-      end
+    it "accepts a class with a validation that's too low" do
+      Dummy.validates_attachment_size :avatar, in: 0..1024
+      expect(matcher.in(256..1024)).to_not accept(Dummy)
+    end
 
 
-      context "given a class with a validation that matches" do
-        before { Dummy.validates_attachment_size :avatar, in: 256..1024 }
-        should_accept_dummy_class
-      end
+    it "accepts a class with a validation that matches" do
+      Dummy.validates_attachment_size :avatar, in: 256..1024
+      expect(matcher.in(256..1024)).to accept(Dummy)
     end
     end
+  end
 
 
-    context "allowing anything" do
-      before do
-        @matcher = self.class.validate_attachment_size(:avatar)
-      end
+  context "allowing anything" do
+    it "given a class with an upper limit" do
+      Dummy.validates_attachment_size :avatar, less_than: 1
+      expect(matcher).to accept(Dummy)
+    end
 
 
-      context "given a class with an upper limit" do
-        before { Dummy.validates_attachment_size :avatar, less_than: 1 }
-        should_accept_dummy_class
-      end
+    it "given a class with a lower limit" do
+      Dummy.validates_attachment_size :avatar, greater_than: 1
+      expect(matcher).to accept(Dummy)
+    end
+  end
 
 
-      context "given a class with a lower limit" do
-        before { Dummy.validates_attachment_size :avatar, greater_than: 1 }
-        should_accept_dummy_class
+  context "using an :if to control the validation" do
+    before do
+      Dummy.class_eval do
+        validates_attachment_size :avatar, greater_than: 1024, if: :go
+        attr_accessor :go
       end
       end
     end
     end
 
 
-    context "using an :if to control the validation" do
-      before do
-        Dummy.class_eval do
-          validates_attachment_size :avatar, greater_than: 1024, if: :go
-          attr_accessor :go
-        end
-        @dummy = Dummy.new
-        @matcher = self.class.validate_attachment_size(:avatar).greater_than(1024)
-      end
+    it "run the validation if the control is true" do
+      dummy = Dummy.new
+      dummy.go = true
+      expect(matcher.greater_than(1024)).to accept(dummy)
+    end
 
 
-      it "run the validation if the control is true" do
-        @dummy.go = true
-        expect(@matcher).to accept(@dummy)
-      end
+    it "not run the validation if the control is false" do
+      dummy = Dummy.new
+      dummy.go = false
+      expect(matcher.greater_than(1024)).to_not accept(dummy)
+    end
+  end
 
 
-      it "not run the validation if the control is false" do
-        @dummy.go = false
-        expect(@matcher).to_not accept(@dummy)
-      end
+  context "post processing" do
+    before do
+      Dummy.validates_attachment_size :avatar, greater_than: 1024
     end
     end
 
 
-    context "post processing" do
-      before do
-        Dummy.validates_attachment_size :avatar, greater_than: 1024
+    it "be skipped" do
+      dummy = Dummy.new
+      dummy.avatar.expects(:post_process).never
+      expect(matcher.greater_than(1024)).to accept(dummy)
+    end
+  end
 
 
-        @dummy = Dummy.new
-        @matcher = self.class.validate_attachment_size(:avatar).greater_than(1024)
-      end
+  private
 
 
-      it "be skipped" do
-        @dummy.avatar.expects(:post_process).never
-        expect(@matcher).to accept(@dummy)
-      end
-    end
+  def matcher
+    self.class.validate_attachment_size(:avatar)
   end
   end
 end
 end

spec/spec_helper.rb

@@ -27,164 +27,11 @@ ActiveSupport::Deprecation.silenced = true
 
 
 RSpec.configure do |config|
 RSpec.configure do |config|
   config.include Assertions
   config.include Assertions
+  config.include ModelReconstruction
+  config.include TestData
+  config.extend RailsHelpers::ClassMethods
   config.mock_framework = :mocha
   config.mock_framework = :mocha
   config.before(:all) do
   config.before(:all) do
     rebuild_model
     rebuild_model
   end
   end
 end
 end
-
-def using_protected_attributes?
-  ActiveRecord::VERSION::MAJOR < 4
-end
-
-def reset_class class_name
-  ActiveRecord::Base.send(:include, Paperclip::Glue)
-  Object.send(:remove_const, class_name) rescue nil
-  klass = Object.const_set(class_name, Class.new(ActiveRecord::Base))
-
-  klass.class_eval do
-    include Paperclip::Glue
-  end
-
-  klass.reset_column_information
-  klass.connection_pool.clear_table_cache!(klass.table_name) if klass.connection_pool.respond_to?(:clear_table_cache!)
-  klass.connection.schema_cache.clear_table_cache!(klass.table_name) if klass.connection.respond_to?(:schema_cache)
-  klass
-end
-
-def reset_table table_name, &block
-  block ||= lambda { |table| true }
-  ActiveRecord::Base.connection.create_table :dummies, {force: true}, &block
-end
-
-def modify_table table_name, &block
-  ActiveRecord::Base.connection.change_table :dummies, &block
-end
-
-def rebuild_model options = {}
-  ActiveRecord::Base.connection.create_table :dummies, force: true do |table|
-    table.column :title, :string
-    table.column :other, :string
-    table.column :avatar_file_name, :string
-    table.column :avatar_content_type, :string
-    table.column :avatar_file_size, :integer
-    table.column :avatar_updated_at, :datetime
-    table.column :avatar_fingerprint, :string
-  end
-  rebuild_class options
-end
-
-def rebuild_class options = {}
-  reset_class("Dummy").tap do |klass|
-    klass.has_attached_file :avatar, options
-    klass.do_not_validate_attachment_file_type :avatar
-    Paperclip.reset_duplicate_clash_check!
-  end
-end
-
-def rebuild_meta_class_of obj, options = {}
-  (class << obj; self; end).tap do |metaklass|
-    metaklass.has_attached_file :avatar, options
-    metaklass.do_not_validate_attachment_file_type :avatar
-    Paperclip.reset_duplicate_clash_check!
-  end
-end
-
-class FakeModel
-  attr_accessor :avatar_file_name,
-                :avatar_file_size,
-                :avatar_updated_at,
-                :avatar_content_type,
-                :avatar_fingerprint,
-                :id
-
-  def errors
-    @errors ||= []
-  end
-
-  def run_paperclip_callbacks name, *args
-  end
-
-  def valid?
-    errors.empty?
-  end
-end
-
-def attachment(options={})
-  Paperclip::Attachment.new(:avatar, FakeModel.new, options)
-end
-
-def silence_warnings
-  old_verbose, $VERBOSE = $VERBOSE, nil
-  yield
-ensure
-  $VERBOSE = old_verbose
-end
-
-def should_accept_dummy_class
-  it "accepts the class" do
-    expect(@matcher).to accept(Dummy)
-  end
-
-  it "accepts an instance of that class" do
-    expect(@matcher).to accept(Dummy.new)
-  end
-end
-
-def should_reject_dummy_class
-  it "rejects the class" do
-    expect(@matcher).to_not accept(Dummy)
-  end
-
-  it "rejects an instance of that class" do
-    expect(@matcher).to_not accept(Dummy.new)
-  end
-end
-
-def with_exitstatus_returning(code)
-  saved_exitstatus = $?.nil? ? 0 : $?.exitstatus
-  begin
-    `ruby -e 'exit #{code.to_i}'`
-    yield
-  ensure
-    `ruby -e 'exit #{saved_exitstatus.to_i}'`
-  end
-end
-
-def stringy_file
-  StringIO.new('.\n')
-end
-
-def fixture_file(filename)
-  File.join(File.dirname(__FILE__), 'fixtures', filename)
-end
-
-def assert_success_response(url)
-  Net::HTTP.get_response(URI.parse(url)) do |response|
-    assert_equal "200", response.code,
-      "Expected HTTP response code 200, got #{response.code}"
-  end
-end
-
-def assert_not_found_response(url)
-  Net::HTTP.get_response(URI.parse(url)) do |response|
-    assert_equal "404", response.code,
-      "Expected HTTP response code 404, got #{response.code}"
-  end
-end
-
-def assert_file_exists(path)
-  assert File.exists?(path), %(Expect "#{path}" to be exists.)
-end
-
-def assert_file_not_exists(path)
-  assert !File.exists?(path), %(Expect "#{path}" to not exists.)
-end
-
-def assert_frame_dimensions(range, frames)
-  frames.each_with_index do |frame, frame_index|
-    frame.split('x').each_with_index do |dimension, dimension_index |
-      assert range.include?(dimension.to_i), "Frame #{frame_index}[#{dimension_index}] should have been within #{range.inspect}, but was #{dimension}"
-    end
-  end
-end

spec/support/assertions.rb

@@ -46,4 +46,26 @@ module Assertions
   def assert_empty(object)
   def assert_empty(object)
     expect(object).to be_empty
     expect(object).to be_empty
   end
   end
+
+  def assert_success_response(url)
+    Net::HTTP.get_response(URI.parse(url)) do |response|
+      assert_equal "200", response.code,
+        "Expected HTTP response code 200, got #{response.code}"
+    end
+  end
+
+  def assert_not_found_response(url)
+    Net::HTTP.get_response(URI.parse(url)) do |response|
+      assert_equal "404", response.code,
+        "Expected HTTP response code 404, got #{response.code}"
+    end
+  end
+
+  def assert_frame_dimensions(range, frames)
+    frames.each_with_index do |frame, frame_index|
+      frame.split('x').each_with_index do |dimension, dimension_index |
+        assert range.include?(dimension.to_i), "Frame #{frame_index}[#{dimension_index}] should have been within #{range.inspect}, but was #{dimension}"
+      end
+    end
+  end
 end
 end

spec/support/fake_model.rb

+class FakeModel
+  attr_accessor(
+    :avatar_file_name,
+    :avatar_file_size,
+    :avatar_updated_at,
+    :avatar_content_type,
+    :avatar_fingerprint,
+    :id
+  )
+
+  def errors
+    @errors ||= []
+  end
+
+  def run_paperclip_callbacks name, *args
+  end
+
+  def valid?
+    errors.empty?
+  end
+end

spec/support/model_reconstruction.rb

+module ModelReconstruction
+  def reset_class class_name
+    ActiveRecord::Base.send(:include, Paperclip::Glue)
+    Object.send(:remove_const, class_name) rescue nil
+    klass = Object.const_set(class_name, Class.new(ActiveRecord::Base))
+
+    klass.class_eval do
+      include Paperclip::Glue
+    end
+
+    klass.reset_column_information
+    klass.connection_pool.clear_table_cache!(klass.table_name) if klass.connection_pool.respond_to?(:clear_table_cache!)
+    klass.connection.schema_cache.clear_table_cache!(klass.table_name) if klass.connection.respond_to?(:schema_cache)
+    klass
+  end
+
+  def reset_table table_name, &block
+    block ||= lambda { |table| true }
+    ActiveRecord::Base.connection.create_table :dummies, {force: true}, &block
+  end
+
+  def modify_table table_name, &block
+    ActiveRecord::Base.connection.change_table :dummies, &block
+  end
+
+  def rebuild_model options = {}
+    ActiveRecord::Base.connection.create_table :dummies, force: true do |table|
+      table.column :title, :string
+      table.column :other, :string
+      table.column :avatar_file_name, :string
+      table.column :avatar_content_type, :string
+      table.column :avatar_file_size, :integer
+      table.column :avatar_updated_at, :datetime
+      table.column :avatar_fingerprint, :string
+    end
+    rebuild_class options
+  end
+
+  def rebuild_class options = {}
+    reset_class("Dummy").tap do |klass|
+      klass.has_attached_file :avatar, options
+      klass.do_not_validate_attachment_file_type :avatar
+      Paperclip.reset_duplicate_clash_check!
+    end
+  end
+
+  def rebuild_meta_class_of obj, options = {}
+    meta_class_of(obj).tap do |metaklass|
+      metaklass.has_attached_file :avatar, options
+      metaklass.do_not_validate_attachment_file_type :avatar
+      Paperclip.reset_duplicate_clash_check!
+    end
+  end
+
+  def meta_class_of(obj)
+    class << obj
+      self
+    end
+  end
+end

spec/support/rails_helpers.rb

+module RailsHelpers
+  module ClassMethods
+    def using_protected_attributes?
+      ActiveRecord::VERSION::MAJOR < 4
+    end
+  end
+end

spec/support/test_data.rb

+module TestData
+  def attachment(options={})
+    Paperclip::Attachment.new(:avatar, FakeModel.new, options)
+  end
+
+  def stringy_file
+    StringIO.new('.\n')
+  end
+
+  def fixture_file(filename)
+    File.join(File.dirname(__FILE__), 'fixtures', filename)
+  end
+end