Make sure syntax doesn’t throw error in SQLite

lib/active_record_union/active_record/relation/union.rb

@@ -19,7 +19,7 @@ module ActiveRecord
       end
 
       private
-      
+
       def verify_union_relations!(*args)
         includes_relations = args.select { |r| r.includes_values.any? }
         if includes_relations.any?

spec/support/models.rb

@@ -7,7 +7,8 @@ end
 
 class Post < ActiveRecord::Base
   connection.create_table :posts, force: true do |t|
-    t.integer :user_id
+    t.integer   :user_id
+    t.timestamp :published_at
     t.timestamps
   end
 

spec/union_spec.rb

@@ -31,6 +31,7 @@ describe ActiveRecord::Relation do
       expect(union.to_sql).to eq(
         "SELECT \"posts\".* FROM ( SELECT \"posts\".* FROM \"posts\"  WHERE \"posts\".\"user_id\" = ? UNION SELECT \"posts\".* FROM \"posts\"  WHERE (created_at > '2014-07-19 00:00:00.000000') ) posts"
       )
+      expect{union.to_a}.to_not raise_error
     end
 
     it "binds values properly" do
@@ -57,6 +58,7 @@ describe ActiveRecord::Relation do
       expect(union.to_sql).to eq(
         "SELECT \"posts\".* FROM ( SELECT \"posts\".* FROM \"posts\"  WHERE (published_at < '2014-07-24 00:00:00.000000') AND (created_at > '2014-07-19 00:00:00.000000') UNION SELECT \"posts\".* FROM \"posts\"  WHERE \"posts\".\"user_id\" = ? ) posts"
       )
+      expect{union.to_a}.to_not raise_error
     end
 
     context "builds a scope when given" do