add single-table inheritance tests

test/acts_as_followable_test.rb

@@ -20,6 +20,8 @@ class ActsAsFollowableTest < ActiveSupport::TestCase
       @jon = FactoryGirl.create(:jon)
       @oasis = FactoryGirl.create(:oasis)
       @metallica = FactoryGirl.create(:metallica)
+      @green_day = FactoryGirl.create(:green_day)
+      @blink_182 = FactoryGirl.create(:blink_182)
       @sam.follow(@jon)
     end
 
@@ -225,6 +227,20 @@ class ActsAsFollowableTest < ActiveSupport::TestCase
       end
     end
 
+    context "followers_with_sti" do
+      setup do
+        @sam.follow(@green_day)
+        @sam.follow(@blink_182)
+      end
+
+      should "return the followers for given type" do
+        assert_equal @sam.follows_by_type('Band').first.followable, @green_day.becomes(Band)
+        assert_equal @sam.follows_by_type('Band').second.followable, @blink_182.becomes(Band)
+        assert @green_day.followers_by_type('User').include?(@sam)
+        assert @blink_182.followers_by_type('User').include?(@sam)
+      end
+    end
+
     context "method_missing" do
       setup do
         @sam.follow(@oasis)

test/dummy30/app/models/band/punk.rb

@@ -0,0 +1,4 @@
+class Band::Punk < Band
+  validates_presence_of :name
+  acts_as_followable
+end

test/dummy30/app/models/band/punk/pop_punk.rb

@@ -0,0 +1,4 @@
+class Band::Punk::PopPunk < Band::Punk
+  validates_presence_of :name
+  acts_as_followable
+end

test/factories/bands.rb

@@ -6,4 +6,12 @@
   factory :metallica, :class => Band do |b|
     b.name 'Metallica'
   end
+
+  factory :green_day, :class => Band::Punk do |b|
+    b.name 'Green Day'
+  end
+
+  factory :blink_182, :class => Band::Punk::PopPunk do |b|
+    b.name 'Blink 182'
+  end
 end