Display group names

src/spectator/formatting/document_formatter.cr

@@ -15,11 +15,24 @@ module Spectator::Formatting
 
     # Does nothing when an example is started.
     def start_example(example)
-      # TODO: Display group names.
+      # TODO: Condense similar parents.
+      current_group = example.group
+      group_list = [] of NestedExampleGroup
+      while current_group.is_a?(NestedExampleGroup)
+        group_list << current_group
+        current_group = current_group.parent
+      end
+      indent = 0
+      group_list.reverse_each do |group|
+        indent.times { @io.print ' ' }
+        @io.puts group.what
+        indent += 2
+      end
     end
 
     # Produces a single character output based on a result.
     def end_example(result)
+      # TODO: Indent.
       @io.puts result.call(Color) { result.example.what }
     end
   end