IN seems to work

spec/arel/attributes/attribute_spec.rb

@@ -7,11 +7,23 @@ module Arel
         it 'should return an equality node' do
           attribute = Attribute.new nil, nil, nil
           equality = attribute.eq 1
-          equality.left.should == attribute
-          equality.right.should == 1
+          check equality.left.should == attribute
+          check equality.right.should == 1
           equality.should be_kind_of Nodes::Equality
         end
       end
+
+      describe '#in' do
+        it 'can be constructed with a list' do
+        end
+
+        it 'should return an in node' do
+          attribute = Attribute.new nil, nil, nil
+          node = Nodes::In.new attribute, [1,2,3]
+          check node.left.should  == attribute
+          check node.right.should == [1, 2, 3]
+        end
+      end
     end
 
     describe 'equality' do

spec/arel/select_manager_spec.rb

@@ -127,7 +127,7 @@ module Arel
       it "chains" do
         table   = Table.new :users
         manager = Arel::SelectManager.new Table.engine
-        manager.from(table).project(table['id']).should == manager
+        check manager.from(table).project(table['id']).should == manager
         manager.to_sql.should be_like 'SELECT "users"."id" FROM "users"'
       end
     end

spec/arel/table_spec.rb

@@ -9,12 +9,12 @@ module Arel
     describe 'new' do
       it 'should accept an engine' do
         rel = Table.new :users, 'foo'
-        rel.engine.should == 'foo'
+        check rel.engine.should == 'foo'
       end
 
       it 'should accept a hash' do
         rel = Table.new :users, :engine => 'foo'
-        rel.engine.should == 'foo'
+        check rel.engine.should == 'foo'
       end
     end
 
@@ -44,7 +44,7 @@ module Arel
     describe 'columns' do
       it 'returns a list of columns' do
         columns = @relation.columns
-        columns.length.should == 2
+        check columns.length.should == 2
         columns.map { |x| x.name }.sort.should == %w{ name id }.sort
       end
     end
@@ -61,7 +61,7 @@ module Arel
       describe 'when given a', Symbol do
         it "manufactures an attribute if the symbol names an attribute within the relation" do
           column = @relation[:id]
-          column.name.should == 'id'
+          check column.name.should == 'id'
           column.should be_kind_of Attributes::Integer
         end
       end

spec/arel/visitors/to_sql_spec.rb

@@ -13,6 +13,15 @@ module Arel
         @visitor.accept attr
       end
 
+      describe "Nodes::In" do
+        it "should know how to visit" do
+          node = @attr.in [1, 2, 3]
+          @visitor.accept(node).should be_like %{
+            "users"."id" IN (1, 2, 3)
+          }
+        end
+      end
+
       describe 'Equality' do
         it "should escape strings" do
           test = @attr.eq 'Aaron Patterson'

spec/spec_helper.rb

@@ -4,6 +4,7 @@ require 'fileutils'
 require 'arel'
 
 require 'support/matchers/be_like'
+require 'support/check'
 
 if adapter = ENV['ADAPTER']
   require "support/connections/#{adapter}_connection.rb"
@@ -11,6 +12,7 @@ end
 
 Spec::Runner.configure do |config|
   config.include Matchers
+  config.include Check
 
   if defined?(ActiveRecord::Base)
     tmp = File.expand_path('../../tmp', __FILE__)