diff --git a/lib/rack/contrib/header_name_transformer.rb b/lib/rack/contrib/header_name_transformer.rb
index 52a1e26..557b107 100644
--- a/lib/rack/contrib/header_name_transformer.rb
+++ b/lib/rack/contrib/header_name_transformer.rb
@@ -4,7 +4,7 @@ module Rack
   # Middleware to change the name of a header
   #
   # So, if a server upstream of Rack sends {'X-Header-Name': "value"}
-  # you can change header to {'Whatever-You-Want': "value"}
+  #  you can change header to {'Whatever-You-Want': "value"}
   #
   # There is a specific use case when ensuring the scheme matches when
   # comparing request.origin and request.base_url for CSRF checking,
diff --git a/test/spec_rack_header_name_transformer.rb b/test/spec_rack_header_name_transformer.rb
index 7cebf15..d289d74 100644
--- a/test/spec_rack_header_name_transformer.rb
+++ b/test/spec_rack_header_name_transformer.rb
@@ -10,13 +10,13 @@
     vendor_header = 'not passed in the request'
     env = Rack::MockRequest.env_for('/', 'HTTP_X_FORWARDED_PROTO' => 'http')
 
-    Rack::Lint.new(Rack::HeaderNameTransformer.new(response, vendor_header, "bar")).call env
+    Rack::Lint.new(Rack::HeaderNameTransformer.new(response, vendor_header, 'bar')).call env
 
     env['HTTP_X_FORWARDED_PROTO'].must_equal 'http'
   end
 
-  it 'copies the value of the vendor header to a newly named header' do
-    env = Rack::MockRequest.env_for('/', {'HTTP_VENDOR' => 'value', 'HTTP_FOO' => 'foo'})
+  it 'copy the value of the vendor header to a newly named header' do
+    env = Rack::MockRequest.env_for('/', { 'HTTP_VENDOR' => 'value', 'HTTP_FOO' => 'foo' })
 
     Rack::Lint.new(Rack::HeaderNameTransformer.new(response, 'Vendor', 'Standard')).call env
     Rack::Lint.new(Rack::HeaderNameTransformer.new(response, 'Foo', 'Bar')).call env
@@ -26,19 +26,34 @@
   end
 
   # Real world headers and use cases
-  it 'copies the value of a vendor forward proto header to the standardised formward proto header' do
+  it 'copy the value of a vendor forward proto header to the standardised formward proto header' do
     env = Rack::MockRequest.env_for('/', 'HTTP_VENDOR_FORWARDED_PROTO_HEADER' => 'https')
 
-    Rack::Lint.new(Rack::HeaderNameTransformer.new(response, 'Vendor-Forwarded-Proto-Header', 'X-Forwarded-Proto')).call env
+    Rack::Lint.new(
+      Rack::HeaderNameTransformer.new(
+        response,
+        'Vendor-Forwarded-Proto-Header',
+        'X-Forwarded-Proto'
+      )
+    ).call env
 
     env['HTTP_X_FORWARDED_PROTO'].must_equal 'https'
   end
 
-  it 'copies the value of a vendor forward proto header to the standardised formward proto header, overwriting an old value in the request' do
-    env = Rack::MockRequest.env_for('/', 'HTTP_VENDOR_FORWARDED_PROTO_HEADER' => 'https',
-                                         'HTTP_X_FORWARDED_PROTO' => 'http')
-
-    Rack::Lint.new(Rack::HeaderNameTransformer.new(response, 'Vendor-Forwarded-Proto-Header', 'X-Forwarded-Proto')).call env
+  it 'copy the value of a vendor forward proto header to the standardised header, overwriting existing request value' do
+    env = Rack::MockRequest.env_for(
+      '/',
+      'HTTP_VENDOR_FORWARDED_PROTO_HEADER' => 'https',
+      'HTTP_X_FORWARDED_PROTO' => 'http'
+    )
+
+    Rack::Lint.new(
+      Rack::HeaderNameTransformer.new(
+        response,
+        'Vendor-Forwarded-Proto-Header',
+        'X-Forwarded-Proto'
+      )
+    ).call env
 
     env['HTTP_X_FORWARDED_PROTO'].must_equal 'https'
   end