Add 'appraisal' to test for Rails 4 compatibility

.gitignore

@@ -5,3 +5,4 @@ Gemfile.lock
 *.swp
 *.gem
 pkg
++/gemfiles/*.lock

Appraisals

@@ -0,0 +1,20 @@
+# Install gems for all appraisal definitions:
+#
+#     $ appraisal install
+#
+# To run tests on different versions:
+#
+#     $ appraisal activesupport_x.x rspec spec
+
+[
+  [ '3.2', '~> 3.2.0' ],
+  [ '4.0', '~> 4.0.0' ],
+  [ '4.1', '~> 4.1.0' ],
+  [ '4.2', '~> 4.2.0' ],
+].each do |ver_name, ver_req|
+  # Note: for the rake task to work, these definition names must be the same as the corresponding
+  # filename produced in "gemfiles/", i.e. all characters must be in this set: [A-Za-z0-9_.]
+  appraise "activesupport_#{ver_name}" do
+    gem 'activesupport', ver_req
+  end
+end

add_http_header.gemspec

@@ -18,7 +18,8 @@ Gem::Specification.new do |spec|
 
   spec.add_runtime_dependency 'activesupport', '>= 0'
 
-  spec.add_development_dependency 'rspec', '~> 2.8.0'
+  spec.add_development_dependency 'rspec', '~> 2.99'
   spec.add_development_dependency 'bundler', '~> 1.7'
   spec.add_development_dependency 'rake', '~> 10.0'
+  spec.add_development_dependency 'appraisal'
 end

gemfiles/activesupport_3.2.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 3.2.0"
+
+gemspec :path => "../"

gemfiles/activesupport_4.0.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 4.0.0"
+
+gemspec :path => "../"

gemfiles/activesupport_4.1.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 4.1.0"
+
+gemspec :path => "../"

gemfiles/activesupport_4.2.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 4.2.0"
+
+gemspec :path => "../"