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diff --git a/spec/engines/sql/unit/predicates/in_spec.rb b/spec/engines/sql/unit/predicates/in_spec.rb
new file mode 100644
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+++ b/spec/engines/sql/unit/predicates/in_spec.rb
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+require 'spec_helper'
+
+module Arel
+  module Predicates
+    describe In do
+      before do
+        @relation = Arel::Table.new(:users)
+        @attribute = @relation[:id]
+      end
+
+      describe '#to_sql' do
+        describe 'when relating to an array' do
+          describe 'when the array\'s elements are the same type as the attribute' do
+            before do
+              @array = [1, 2, 3]
+            end
+
+            it 'manufactures sql with a comma separated list' do
+              sql = In.new(@attribute, @array).to_sql
+
+              adapter_is :mysql do
+                sql.should be_like(%Q{`users`.`id` IN (1, 2, 3)})
+              end
+
+              adapter_is :oracle do
+                sql.should be_like(%Q{"USERS"."ID" IN (1, 2, 3)})
+              end
+
+              adapter_is_not :mysql, :oracle do
+                sql.should be_like(%Q{"users"."id" IN (1, 2, 3)})
+              end
+            end
+          end
+
+          describe 'when the array\'s elements are not same type as the attribute' do
+            before do
+              @array = ['1-asdf', 2, 3]
+            end
+
+            it 'formats values in the array as the type of the attribute' do
+              sql = In.new(@attribute, @array).to_sql
+
+              adapter_is :mysql do
+                sql.should be_like(%Q{`users`.`id` IN (1, 2, 3)})
+              end
+
+              adapter_is :oracle do
+                sql.should be_like(%Q{"USERS"."ID" IN (1, 2, 3)})
+              end
+
+              adapter_is_not :mysql, :oracle do
+                sql.should be_like(%Q{"users"."id" IN (1, 2, 3)})
+              end
+            end
+          end
+
+          describe 'when the array is empty' do
+            before do
+              @array = []
+            end
+
+            it 'manufactures sql with a comma separated list' do
+              sql = In.new(@attribute, @array).to_sql
+
+              adapter_is :mysql do
+                sql.should be_like(%Q{`users`.`id` IN (NULL)})
+              end
+
+              adapter_is :oracle do
+                sql.should be_like(%Q{"USERS"."ID" IN (NULL)})
+              end
+
+              adapter_is_not :mysql, :oracle do
+                sql.should be_like(%Q{"users"."id" IN (NULL)})
+              end
+            end
+          end
+
+        end
+
+        describe 'when relating to a range' do
+          before do
+            @range = 1..2
+          end
+
+          it 'manufactures sql with a between' do
+            sql = In.new(@attribute, @range).to_sql
+
+            adapter_is :mysql do
+              sql.should be_like(%Q{`users`.`id` BETWEEN 1 AND 2})
+            end
+
+            adapter_is :oracle do
+              sql.should be_like(%Q{"USERS"."ID" BETWEEN 1 AND 2})
+            end
+
+            adapter_is_not :mysql, :oracle do
+              sql.should be_like(%Q{"users"."id" BETWEEN 1 AND 2})
+            end
+          end
+        end
+
+        describe 'when relating to a time range' do
+          before do
+            @relation = Arel::Table.new(:developers)
+            @attribute = @relation[:created_at]
+            @range = Time.mktime(2010, 01, 01)..Time.mktime(2010, 02, 01)
+          end
+
+          it 'manufactures sql with a between' do
+            sql = In.new(@attribute, @range).to_sql
+
+            adapter_is :mysql do
+              sql.should be_like(%Q{`developers`.`created_at` BETWEEN '2010-01-01 00:00:00' AND '2010-02-01 00:00:00'})
+            end
+
+            adapter_is :sqlite3 do
+              if RUBY_VERSION < '1.9'
+                sql.should be_like(%Q{"developers"."created_at" BETWEEN '2010-01-01 00:00:00.000000' AND '2010-02-01 00:00:00.000000'})
+              else
+                sql.should be_like(%Q{"developers"."created_at" BETWEEN '2010-01-01 00:00:00' AND '2010-02-01 00:00:00'})
+              end
+            end
+
+            adapter_is :postgresql do
+              sql.should be_like(%Q{"developers"."created_at" BETWEEN '2010-01-01 00:00:00.000000' AND '2010-02-01 00:00:00.000000'})
+            end
+
+            adapter_is :oracle do
+              sql.should be_like(%Q{"DEVELOPERS"."CREATED_AT" BETWEEN TO_TIMESTAMP('2010-01-01 00:00:00:000000','YYYY-MM-DD HH24:MI:SS:FF6') AND TO_TIMESTAMP('2010-02-01 00:00:00:000000','YYYY-MM-DD HH24:MI:SS:FF6')})
+            end
+          end
+        end
+
+        describe 'when relating to a relation' do
+          it 'manufactures sql with a subselect' do
+            sql = In.new(@attribute, @relation).to_sql
+
+            adapter_is :mysql do
+              sql.should be_like(%Q{
+                `users`.`id` IN (SELECT `users`.`id`, `users`.`name` FROM `users`)
+              })
+            end
+
+            adapter_is :oracle do
+              sql.should be_like(%Q{
+                "USERS"."ID" IN (SELECT "USERS"."ID", "USERS"."NAME" FROM "USERS")
+              })
+            end
+
+            adapter_is_not :mysql, :oracle do
+              sql.should be_like(%Q{
+                "users"."id" IN (SELECT "users"."id", "users"."name" FROM "users")
+              })
+            end
+          end
+        end
+      end
+    end
+  end
+end