bundle rackup gem that includes webrick handler that was extracted from rack

Author: amatsuda

Gemfile

@@ -14,6 +14,7 @@ group :development do
   gem "apparition", github: "twalpole/apparition" # LOCKED: When this is released, use a released version https://github.com/twalpole/apparition/pull/79
   gem "aruba", "~> 1.0"
   gem "capybara", "~> 3.31"
+  gem "rackup"
   gem "cucumber", "~> 4.0"
   gem "minitest"
   gem "rake", "~> 13.0"

Gemfile.lock

@@ -121,6 +121,9 @@ GEM
     rack (3.0.8)
     rack-test (2.1.0)
       rack (>= 1.3)
+    rackup (2.0.0)
+      rack (>= 3)
+      webrick
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.8.1)
@@ -189,6 +192,7 @@ DEPENDENCIES
   matrix
   minitest
   pry
+  rackup
   rake (~> 13.0)
   rspec (~> 3.2)
   rubocop