Merge pull request #836 from planio-gmbh/808-pass_respond_to

fix: Mail::Field correctly responds_to? the methods of its instantiated field

Author: bf4

CHANGELOG.rdoc

@@ -1,5 +1,6 @@
 == HEAD
 
+* #808 - Mail::Field correctly responds_to? the methods of its instantiated field (thegcat)
 * #772 - normalize encoding matchers (grosser)
 * #789 - Fix encoding collapsing not dealing with multiple encodings in 1 line (grosser)
 * #775 - avoid failed encodings / stop bad charsets early (grosser)

lib/mail/field.rb

@@ -189,6 +189,16 @@ def method_missing(name, *args, &block)
       field.send(name, *args, &block)
     end
 
+    if RUBY_VERSION >= '1.9.2'
+      def respond_to_missing?(method_name, include_private)
+        field.respond_to?(method_name, include_private) || super
+      end
+    else
+      def respond_to?(method_name, include_private = false)
+        field.respond_to?(method_name, include_private) || super
+      end
+    end
+
     FIELD_ORDER = %w[ return-path received
                       resent-date resent-from resent-sender resent-to
                       resent-cc resent-bcc resent-message-id

spec/mail/field_spec.rb

@@ -99,6 +99,13 @@
       field.addresses
     end
 
+    it "should respond_to? its own methods and the same methods as its instantiated field class" do
+      field = Mail::Field.new('To: Bob')
+      expect(field.respond_to?(:field)).to be_truthy
+      expect(field.field).to receive(:"respond_to?").once
+      field.respond_to?(:addresses)
+    end
+
     it "should change its type if you change the name" do
       field = Mail::Field.new("To: [email protected]")
       expect(field.field.class).to eq Mail::ToField