diff --git a/travis-matrix-preview/.gitignore b/travis-matrix-preview/.gitignore
new file mode 100644
index 0000000..77471be
--- /dev/null
+++ b/travis-matrix-preview/.gitignore
@@ -0,0 +1,2 @@
+Gemfile.lock
+.*env
diff --git a/travis-matrix-preview/Gemfile b/travis-matrix-preview/Gemfile
new file mode 100644
index 0000000..6ba5029
--- /dev/null
+++ b/travis-matrix-preview/Gemfile
@@ -0,0 +1,5 @@
+source 'https://rubygems.org'
+
+gem 'puma'
+gem 'sinatra'
+gem 'sinatra-contrib', require: 'sinatra/contrib'
diff --git a/travis-matrix-preview/app.rb b/travis-matrix-preview/app.rb
new file mode 100644
index 0000000..a5ca7ba
--- /dev/null
+++ b/travis-matrix-preview/app.rb
@@ -0,0 +1,5 @@
+require 'sinatra/base'
+
+class App < Sinatra::Base
+  run! if app_file == $PROGRAM_NAME
+end
diff --git a/travis-matrix-preview/config.ru b/travis-matrix-preview/config.ru
new file mode 100644
index 0000000..5b106e2
--- /dev/null
+++ b/travis-matrix-preview/config.ru
@@ -0,0 +1,2 @@
+require './app'
+run App