Enable TravisCI, add spec for add_predicate

.travis.yml

@@ -0,0 +1,7 @@
+rvm:
+  - 1.8.7
+  - 1.9.2
+  - ree
+  - rbx
+  - rbx-2.0
+  - ruby-head

Gemfile

@@ -1,14 +1,39 @@
 source "http://rubygems.org"
 gemspec
 
-if ENV['RAILS_VERSION'] == 'release'
-  gem 'activesupport'
-  gem 'activerecord'
-  gem 'actionpack'
+gem 'rake'
+
+rails = ENV['RAILS'] || 'master'
+arel = ENV['AREL'] || 'master'
+
+arel_opts = case arel
+when /\// # A path
+  {:path => arel}
+when /^v/ # A tagged version
+  {:git => 'git://github.com/rails/arel.git', :tag => arel}
 else
-  gem 'arel',  :git => 'git://github.com/rails/arel.git'
-  git 'git://github.com/rails/rails.git' do
+  {:git => 'git://github.com/rails/arel.git', :branch => arel}
+end
+
+gem 'arel', arel_opts
+
+case rails
+when /\// # A path
+  gem 'activesupport', :path => "#{rails}/activesupport"
+  gem 'activemodel', :path => "#{rails}/activemodel"
+  gem 'activerecord', :path => "#{rails}/activerecord"
+  gem 'actionpack', :path => "#{rails}/activerecord"
+when /^v/ # A tagged version
+  git 'git://github.com/rails/rails.git', :tag => rails do
     gem 'activesupport'
+    gem 'activemodel'
+    gem 'activerecord'
+    gem 'actionpack'
+  end
+else
+  git 'git://github.com/rails/rails.git', :branch => rails do
+    gem 'activesupport'
+    gem 'activemodel'
     gem 'activerecord'
     gem 'actionpack'
   end

spec/ransack/configuration_spec.rb

@@ -7,5 +7,25 @@ module Ransack
         config.should eq Ransack
       end
     end
+
+    it 'adds predicates' do
+      Ransack.configure do |config|
+        config.add_predicate :test_predicate
+      end
+
+      Ransack.predicates.should have_key 'test_predicate'
+      Ransack.predicates.should have_key 'test_predicate_any'
+      Ransack.predicates.should have_key 'test_predicate_all'
+    end
+
+    it 'avoids creating compound predicates if :compounds => false' do
+      Ransack.configure do |config|
+        config.add_predicate :test_predicate_without_compound, :compounds => false
+      end
+
+      Ransack.predicates.should have_key 'test_predicate_without_compound'
+      Ransack.predicates.should_not have_key 'test_predicate_without_compound_any'
+      Ransack.predicates.should_not have_key 'test_predicate_without_compound_all'
+    end
   end
 end