Add ability to specify ".allowing" and ".rejecting" individually with…

… content_type validation matcher.

Closes thoughtbot#472, Closes thoughtbot#532

lib/paperclip/matchers/validate_attachment_content_type_matcher.rb

@@ -17,6 +17,8 @@ def validate_attachment_content_type name
       class ValidateAttachmentContentTypeMatcher
         def initialize attachment_name
           @attachment_name = attachment_name
+          @allowed_types = []
+          @rejected_types = []
         end
 
         def allowing *types
@@ -37,13 +39,19 @@ def matches? subject
         end
 
         def failure_message
-          "Content types #{@allowed_types.join(", ")} should be accepted" +
-          " and #{@rejected_types.join(", ")} rejected by #{@attachment_name}"
+          "".tap do |str|
+            str << "Content types #{@allowed_types.join(", ")} should be accepted" if @allowed_types.present?
+            str << "\n" if @allowed_types.present && @rejected_types.present?
+            str << "Content types #{@rejected_types.join(", ")} should be rejected by #{@attachment_name}" if @rejected_types.present?
+          end
         end
 
         def negative_failure_message
-          "Content types #{@allowed_types.join(", ")} should be rejected" +
-          " and #{@rejected_types.join(", ")} accepted by #{@attachment_name}"
+          "".tap do |str|
+            str << "Content types #{@allowed_types.join(", ")} should be rejected" if @allowed_types.present?
+            str << "\n" if @allowed_types.present && @rejected_types.present?
+            str << "Content types #{@rejected_types.join(", ")} should be accepted by #{@attachment_name}" if @rejected_types.present?
+          end
         end
 
         def description
@@ -52,22 +60,20 @@ def description
 
         protected
 
-        def allow_types?(types)
-          types.all? do |type|
-            file = StringIO.new(".")
-            file.content_type = type
-            (subject = @subject.new).attachment_for(@attachment_name).assign(file)
-            subject.valid?
-            subject.errors[:"#{@attachment_name}_content_type"].blank?
-          end
+        def type_allowed?(type)
+          file = StringIO.new(".")
+          file.content_type = type
+          (subject = @subject.new).attachment_for(@attachment_name).assign(file)
+          subject.valid?
+          subject.errors[:"#{@attachment_name}_content_type"].blank?
         end
 
         def allowed_types_allowed?
-          allow_types?(@allowed_types)
+          @allowed_types.all? { |type| type_allowed?(type) }
         end
 
         def rejected_types_rejected?
-          not allow_types?(@rejected_types)
+          !@rejected_types.any? { |type| type_allowed?(type) }
         end
       end
     end

test/matchers/validate_attachment_content_type_matcher_test.rb

@@ -43,5 +43,45 @@ class ValidateAttachmentContentTypeMatcherTest < Test::Unit::TestCase
 
       should_accept_dummy_class
     end
+
+    context "given a class that matches and a matcher that only specifies 'allowing'" do
+      setup do
+        @dummy_class.validates_attachment_content_type :avatar, :content_type => %r{image/.*}
+        @matcher     = self.class.validate_attachment_content_type(:avatar).
+          allowing(%w(image/png image/jpeg))
+      end
+
+      should_accept_dummy_class
+    end
+
+    context "given a class that does not match and a matcher that only specifies 'allowing'" do
+      setup do
+        @dummy_class.validates_attachment_content_type :avatar, :content_type => %r{audio/.*}
+        @matcher     = self.class.validate_attachment_content_type(:avatar).
+          allowing(%w(image/png image/jpeg))
+      end
+
+      should_reject_dummy_class
+    end
+
+    context "given a class that matches and a matcher that only specifies 'rejecting'" do
+      setup do
+        @dummy_class.validates_attachment_content_type :avatar, :content_type => %r{image/.*}
+        @matcher     = self.class.validate_attachment_content_type(:avatar).
+          rejecting(%w(audio/mp3 application/octet-stream))
+      end
+
+      should_accept_dummy_class
+    end
+
+    context "given a class that does not match and a matcher that only specifies 'rejecting'" do
+      setup do
+        @dummy_class.validates_attachment_content_type :avatar, :content_type => %r{audio/.*}
+        @matcher     = self.class.validate_attachment_content_type(:avatar).
+          rejecting(%w(audio/mp3 application/octet-stream))
+      end
+
+      should_reject_dummy_class
+    end
   end
 end