Converts headers to a hash with stringified keys

lib/blanket/wrapper.rb

@@ -71,7 +71,7 @@ def request(method, id=nil, options={})
 
       response = HTTParty.public_send(method, uri, {
         query:   params,
-        headers: headers,
+        headers: stringify_keys(headers),
         body:    options[:body]
       }.reject { |_, value| value.nil? || value.empty? })
 
@@ -94,5 +94,9 @@ def merged_params(params)
     def uri_from_parts(parts)
       File.join @base_uri, *parts.compact.map(&:to_s)
     end
+
+    def stringify_keys(hash)
+      hash.inject({}) {|memo,(k,v)| memo[k.to_s] = v; memo}
+    end
   end
 end

spec/blanket/wrapper_spec.rb

@@ -101,14 +101,14 @@
       it 'allows sending headers in a request' do
         api.users(55).get(headers: {foo: 'bar'})
 
-        expect(HTTParty).to have_received(:get).with('http://api.example.org/users/55', headers: {foo: 'bar'})
+        expect(HTTParty).to have_received(:get).with('http://api.example.org/users/55', headers: {"foo" => "bar"})
       end
 
       it 'allows setting headers globally' do
         api = Blanket::wrap("http://api.example.org", headers: {token: 'my secret token'})
         api.users(55).get()
 
-        expect(HTTParty).to have_received(:get).with('http://api.example.org/users/55', headers: {token: 'my secret token'})
+        expect(HTTParty).to have_received(:get).with('http://api.example.org/users/55', headers: {"token" => "my secret token"})
       end
     end