fix: correct url encoding for expanded HAL links

Fixes: pact-foundation/pact_broker-client#44

lib/pact/hal/link.rb

@@ -1,4 +1,4 @@
-require 'uri'
+require 'erb'
 require 'delegate'
 
 module Pact
@@ -54,11 +54,9 @@ def wrap_response(href, http_response)
       end
 
       def expand_url(params, url)
-        new_url = url
-        params.each do | key, value |
-          new_url = new_url.gsub('{' + key.to_s + '}', URI.escape(value))
+        params.inject(url) do | url, (key, value) |
+          url.gsub('{' + key.to_s + '}', ERB::Util.url_encode(value))
         end
-        new_url
       end
     end
   end

spec/lib/pact/hal/link_spec.rb

@@ -102,6 +102,10 @@ module Hal
         it "returns a duplicate Link with the expanded href with URL escaping" do
           expect(subject.expand(bar: 'wiffle meep').href).to eq "http://foo/wiffle%20meep"
         end
+
+        it "returns a duplicate Link with the expanded href with URL escaping for forward slashes" do
+          expect(subject.expand(bar: 'wiffle/meep').href).to eq "http://foo/wiffle%2Fmeep"
+        end
       end
     end
   end