Adding spec for error raising with raise: true option

README.md

@@ -92,7 +92,7 @@ By default, when a parameter precondition fails, `Sinatra::Param` will `halt 400
 }
 ```
 
-To change this, you can set `:raise_sinatra_param_exceptions` to `true`, and intercept `Sinatra::Param::InvalidParameterError` with a Sinatra `error do...end` block. (To make this work in development, set `:show_exceptions` to `false`):
+To change this, you can set `:raise_sinatra_param_exceptions` to `true`, and intercept `Sinatra::Param::InvalidParameterError` with a Sinatra `error do...end` block. (To make this work in development, set `:show_exceptions` to `false` and `:raise_errors` to `true`):
 
 ```ruby
 set :raise_sinatra_param_exceptions, true

spec/dummy/app.rb

@@ -1,11 +1,15 @@
 require 'sinatra/base'
 require 'sinatra/param'
-require 'json'
+require 'date'
 require 'time'
+require 'json'
 
 class App < Sinatra::Base
   helpers Sinatra::Param
 
+  set :show_exceptions, false
+  set :raise_errors, true
+
   before do
     content_type :json
   end
@@ -182,4 +186,9 @@ class App < Sinatra::Base
       message: 'OK'
     }.to_json
   end
+
+  get '/raise' do
+    param :arg, String, required: true, raise: true
+    params.to_json
+  end
 end

spec/parameter_raise_spec.rb

@@ -0,0 +1,11 @@
+require 'spec_helper'
+
+describe 'Exception' do
+  describe 'raise' do
+    it 'should raise error when option is specified' do
+      expect {
+        get('/raise')
+      }.to raise_error
+    end
+  end
+end