add new tests

test/attachment_adapter_test.rb

@@ -16,6 +16,10 @@ class AttachmentAdapterTest < Test::Unit::TestCase
     assert_equal "5k.png", @subject.original_filename
   end
 
+  should "force binmode on tempfile" do
+    assert @subject.instance_variable_get("@tempfile").binmode?
+  end
+
   should "get the content type" do
     assert_equal "image/png", @subject.content_type
   end

test/file_adapter_test.rb

@@ -12,6 +12,10 @@ class FileAdapterTest < Test::Unit::TestCase
       assert_equal "5k.png", @subject.original_filename
     end
 
+    should "force binmode on tempfile" do
+      assert @subject.instance_variable_get("@tempfile").binmode?
+    end
+
     should "get the content type" do
       assert_equal "image/png", @subject.content_type
     end

test/uploaded_file_adapter_test.rb

@@ -21,6 +21,10 @@ class UploadedFileAdapterTest < Test::Unit::TestCase
         assert_equal "5k.png", @subject.original_filename
       end
 
+      should "force binmode on tempfile" do
+        assert @subject.instance_variable_get("@tempfile").binmode?
+      end
+
       should "get the content type" do
         assert_equal "image/png", @subject.content_type
       end
@@ -61,6 +65,10 @@ class UploadedFileAdapterTest < Test::Unit::TestCase
         assert_equal "5k.png", @subject.original_filename
       end
 
+      should "force binmode on tempfile" do
+        assert @subject.instance_variable_get("@tempfile").binmode?
+      end
+
       should "get the content type" do
         assert_equal "image/png", @subject.content_type
       end