Implement getUnknownMessage in UnknownOption

This allows to retrive the unknown option in
question when catching the error.
This can be useful to, for example, taylor a
spesific output for common errors amongst users.

1 files changed, 7 insertions, 0 deletions

diff --git a/test/error_test.rb b/test/error_test.rb
index 6a33c04..7ea30fc 100644
--- a/test/error_test.rb
+++ b/test/error_test.rb
@@ -21,6 +21,13 @@ describe Slop::UnknownOption do
     opts = Slop::Options.new
     opts.string "-n", "--name"
     assert_raises(Slop::UnknownOption) { opts.parse %w(--foo) }
+
+    #Assert returns the unknown option in quetion
+    begin
+      opts.parse %w(--foo)
+    rescue Slop::UnknownOption => e
+      assert_equal(e.getUnknowOption(), "--foo");
+    end
   end
 
   it "does not raise when errors are suppressed" do