specs for mongoid scopes

spec/models/mongoid_spec.rb

@@ -0,0 +1,52 @@
+require File.expand_path('../spec_helper', File.dirname(__FILE__))
+require 'mongoid'
+require File.expand_path('../../lib/kaminari/mongoid_extension', File.dirname(__FILE__))
+
+describe Kaminari::MongoidExtension do
+  before :all do
+    class Developer
+      include ::Mongoid::Document
+    end
+  end
+  before do
+    stub(subject).count { 300 } # in order to avoid DB access...
+  end
+
+  describe '#page' do
+    context 'page 1' do
+      subject { Developer.page 1 }
+      it { should be_a Mongoid::Criteria }
+      its(:current_page) { should == 1 }
+      its(:limit_value) { should == 25 }
+      its(:num_pages) { should == 12 }
+      it { should skip(0) }
+    end
+
+    context 'page 2' do
+      subject { Developer.page 2 }
+      it { should be_a Mongoid::Criteria }
+      its(:current_page) { should == 2 }
+      its(:limit_value) { should == 25 }
+      its(:num_pages) { should == 12 }
+      it { should skip 25 }
+    end
+
+    context 'page "foobar"' do
+      subject { Developer.page 'foobar' }
+      it { should be_a Mongoid::Criteria }
+      its(:current_page) { should == 1 }
+      its(:limit_value) { should == 25 }
+      its(:num_pages) { should == 12 }
+      it { should skip 0 }
+    end
+  end
+
+  describe '#per' do
+    subject { Developer.page(2).per(10) }
+    it { should be_a Mongoid::Criteria }
+    its(:current_page) { should == 2 }
+    its(:limit_value) { should == 10 }
+    its(:num_pages) { should == 30 }
+    it { should skip 10 }
+  end
+end

spec/spec_helper.rb

@@ -1,6 +1,7 @@
 $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
 $LOAD_PATH.unshift(File.dirname(__FILE__))
 require 'rails'
+require 'mongoid'
 require 'kaminari'
 
 require File.join(File.dirname(__FILE__), 'fake_app')

spec/support/matchers.rb

@@ -38,3 +38,9 @@ def instance_of(klass)
     "expected #{count || 'any'} instance(s) of #{@klass.name} but was #{@count}"
   end
 end
+
+RSpec::Matchers.define :skip do |num|
+  match do |criteria|
+    criteria.instance_variable_get('@options')[:skip] == num
+  end
+end