fix: dynamically load pact/matchers

This fixes the require issues caused by 3d2a488

lib/pact/shared/form_differ.rb

@@ -3,10 +3,9 @@
 module Pact
   class FormDiffer
 
-    extend Matchers
-
     def self.call expected, actual, options = {}
-      diff to_hash(expected), to_hash(actual), options
+      require 'pact/matchers' # avoid recursive loop between this file and pact/matchers
+      ::Pact::Matchers.diff to_hash(expected), to_hash(actual), options
     end
 
     def self.to_hash form_body
@@ -29,6 +28,5 @@ def self.decode_www_form string
         hash[key] << value
       end
     end
-
   end
 end

lib/pact/shared/json_differ.rb

@@ -1,13 +1,10 @@
 module Pact
   class JsonDiffer
 
-    extend Matchers
-
     # Delegates to https://github.com/pact-foundation/pact-support/blob/master/lib/pact/matchers/matchers.rb#L25
     def self.call expected, actual, options = {}
-      diff expected, actual, options
+      require 'pact/matchers' # avoid recursive loop between this file and pact/matchers
+      ::Pact::Matchers.diff expected, actual, options
     end
-
-
   end
 end

lib/pact/shared/text_differ.rb

@@ -1,12 +1,10 @@
-require 'pact/matchers/difference'
 
 module Pact
   class TextDiffer
 
-    extend Matchers
-
     def self.call expected, actual, options = {}
-      diff expected, actual, options
+      require 'pact/matchers' # avoid recursive loop between this file and pact/matchers
+      ::Pact::Matchers.diff expected, actual, options
     end
 
   end