[chef] How do I test an attribute value in an "only_if" test?

[ItsMikeE < >]

I have two possible values of a variable, the default attribute and one
overridden in a role.
In my recipe I would like to test the value of the variable

Code is of the format

cookbook_file  "/dir/file" do
  action :create
  source "default file"
  owner "root"
  group "root"
  mode 0644
  only_if "test [:filetype]="default""
end

cookbook_file  "/dir/file" do
  action :create
  source "other file"
  owner "root"
  group "root"
  mode 0644
  only_if "test [:filetype]="other""
end

The only_if test is not working (syntax error).
Is there a way to do this kind of check?