scan_for_focus_path should return an empty array if path is a directory

lib/guard/cucumber/focuser.rb

@@ -44,6 +44,7 @@ def focus(paths, focus_tag)
         end
 
         # Checks to see if the file at path contains the focus tag
+        # It will return an empty array if the path is a directory.
         #
         # @param [String] path the file path to search
         # @param [String] focus_tag the focus tag to look for in each path
@@ -52,6 +53,8 @@ def focus(paths, focus_tag)
         def scan_path_for_focus_tag(path, focus_tag)
           line_numbers = []
 
+          return line_numbers if File.directory?(path)
+
           File.open(path, 'r') do |f|
             while (line = f.gets)
               if line.include?(focus_tag)

spec/guard/cucumber/focuser_spec.rb

@@ -104,6 +104,17 @@
         focuser.scan_path_for_focus_tag(path, focus_tag).should eql([])
       end
     end
+
+    context 'file that is a directory' do
+      before do
+        File.should_receive(:directory?).with(dir).and_return(true)
+      end
+
+      it 'returns an empty array' do
+        focuser.scan_path_for_focus_tag(dir, focus_tag).should eql([])
+      end
+    end
+
   end
 
   describe '#append_line_numbers_to_path' do