diff --git a/Gemfile b/Gemfile
index d9266971..851fabc2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,2 +1,2 @@
 source 'https://rubygems.org'
-gemspec
\ No newline at end of file
+gemspec
diff --git a/features/site_configuration.feature b/features/site_configuration.feature
index 89324cb1..4f807eae 100644
--- a/features/site_configuration.feature
+++ b/features/site_configuration.feature
@@ -225,3 +225,11 @@ Feature: Site configuration
     And I should see "Page Layout: 2 on 2010-01-01" in "_site/index.html"
     And I should see "Post Layout: <p>content for entry1.</p>" in "_site/2007/12/31/entry1.html"
     And I should see "Post Layout: <p>content for entry2.</p>" in "_site/2020/01/31/entry2.html"
+
+  Scenario: Add a gem-based plugin
+    Given I have an "index.html" file that contains "Whatever"
+    And I have a configuration file with "gems" set to "[jekyll_test_plugin]"
+    When I run jekyll
+    Then the _site directory should exist
+    And I should see "Whatever" in "_site/index.html"
+    And I should see "this is a test" in "_site/test.txt"
diff --git a/jekyll.gemspec b/jekyll.gemspec
index 35368433..ce7a211a 100644
--- a/jekyll.gemspec
+++ b/jekyll.gemspec
@@ -47,6 +47,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency('simplecov-gem-adapter', "~> 1.0.1")
   s.add_development_dependency('coveralls', "~> 0.7.0")
   s.add_development_dependency('activesupport', '~> 3.2.13')
+  s.add_development_dependency('jekyll_test_plugin')
 
   # = MANIFEST =
   s.files = %w[