Matching partial body params

lib/webmock/request_pattern.rb

@@ -147,7 +147,7 @@ def matches?(body, content_type = "")
         when :xml then
           Crack::XML.parse(body) == @pattern
         else
-          Addressable::URI.parse('?' + body).query_values == @pattern
+          hash_contains?(Addressable::URI.parse('?' + body).query_values, @pattern)
         end
       else
         empty_string?(@pattern) && empty_string?(body) ||
@@ -161,6 +161,10 @@ def to_s
     end
 
     private
+
+    def hash_contains?(haystack, needle)
+      needle.select{|k, v| haystack[k] != v}.empty?
+    end
 
     def empty_string?(string)
       string.nil? || string == ""

spec/request_pattern_spec.rb

@@ -214,7 +214,12 @@ def match(request_signature)
               should match(WebMock::RequestSignature.new(:post, "www.example.com", :body => 'a=1&c[d][]=e&b=five&c[d][]=f'))
           end
 
-          it "should not match when hash doesn't match url encoded body" do
+          it "should match if body is a superset of pattern hash" do
+            WebMock::RequestPattern.new(:post, "www.example.com", :body => {:a => "1"}).
+              should match(WebMock::RequestSignature.new(:post, "www.example.com", :body => 'a=1&c[d][]=e&c[d][]=f&b=five'))
+          end
+
+          it "should not match when hash is not completely contained by url encoded body" do
            WebMock::RequestPattern.new(:post, 'www.example.com', :body => body_hash).
               should_not match(WebMock::RequestSignature.new(:post, "www.example.com", :body => 'c[d][]=f&a=1&c[d][]=e'))
           end