Add string inclusion into the include-json matcher

Author: laserlemon

lib/json_spec/matchers/include_json.rb

@@ -17,6 +17,7 @@ def matches?(actual_json)
         case actual
         when Hash then actual.values.map{|v| exclude_keys(v) }.include?(expected)
         when Array then actual.map{|e| exclude_keys(e) }.include?(expected)
+        when String then actual.include?(expected)
         else false
         end
       end

spec/json_spec/matchers/include_json_spec.rb

@@ -45,6 +45,12 @@
     json.should include_json(%([5,6]))
   end
 
+  it "matches a substring" do
+    json = %("json")
+    json.should include_json(%("js"))
+    json.should include_json(%("json"))
+  end
+
   it "matches at a path" do
     %({"one":{"two":[3,4]}}).should include_json(%([3,4])).at_path("one")
   end