diff --git a/lib/common/models/wp_timthumb.rb b/lib/common/models/wp_timthumb.rb
index fa31a8ec..6261b94a 100755
--- a/lib/common/models/wp_timthumb.rb
+++ b/lib/common/models/wp_timthumb.rb
@@ -8,5 +8,4 @@ class WpTimthumb < WpItem
   include WpTimthumb::Versionable
   include WpTimthumb::Existable
   include WpTimthumb::Output
-
 end
diff --git a/lib/common/models/wp_timthumb/existable.rb b/lib/common/models/wp_timthumb/existable.rb
index 7b022b11..c7f7369e 100644
--- a/lib/common/models/wp_timthumb/existable.rb
+++ b/lib/common/models/wp_timthumb/existable.rb
@@ -3,6 +3,10 @@
 class WpTimthumb < WpItem
   module Existable
 
+    # @param [ Typhoeus::Response ] response
+    # @param [ Hash ] options
+    #
+    # @return [ Boolean ]
     def exists_from_response?(response, options = {})
       response.code == 400 && response.body =~ /no image specified/i ? true : false
     end
diff --git a/spec/lib/common/models/wp_timthumb_spec.rb b/spec/lib/common/models/wp_timthumb_spec.rb
new file mode 100644
index 00000000..57d3e3e9
--- /dev/null
+++ b/spec/lib/common/models/wp_timthumb_spec.rb
@@ -0,0 +1,12 @@
+# encoding: UTF-8
+
+require 'spec_helper'
+
+describe WpTimthumb do
+  it_behaves_like 'WpTimthumb::Existable'
+
+  subject(:wp_timthumb) { WpTimthumb.new(uri, options) }
+  let(:uri)             { URI.parse('http://example.com/') }
+  let(:options)         { {} }
+
+end
diff --git a/spec/shared_examples/wp_timthumb_existable.rb b/spec/shared_examples/wp_timthumb_existable.rb
new file mode 100644
index 00000000..58b91dfc
--- /dev/null
+++ b/spec/shared_examples/wp_timthumb_existable.rb
@@ -0,0 +1,37 @@
+# encoding: UTF-8
+
+shared_examples 'WpTimthumb::Existable' do
+
+  describe 'exists_from_response?' do
+    after do
+      response = Typhoeus::Response.new(@resp_opt)
+      subject.send(:exists_from_response?, response).should == @expected
+    end
+
+    context 'when the status is not a 400' do
+      it 'returns false' do
+        @resp_opt = { code: 200 }
+        @expected = false
+      end
+    end
+
+    context 'when the status is a 400' do
+      let(:opt) { { code: 400 } }
+
+      context 'when the body contains "no image specified"' do
+        it 'returns true' do
+          @resp_opt = opt.merge(body: 'The following error(s) occured:<br/>No image specified')
+          @expected = true
+        end
+      end
+
+      context 'otherwise' do
+        it 'returns false' do
+          @resp_opt = opt.merge(body: 'im a fake one, hehe')
+          @expected = false
+        end
+      end
+    end
+  end
+
+end