need an edge-case type test? simply add a new hash y'all!

parse_note_spec.rb

describe Note do
  describe 'notes with valid time entry' do
    [ {text: 't:9h20m',   parsed_entry: 33600},
      {text: 't:20m',     parsed_entry: 1200},
      {text: 't: 9h',     parsed_entry: 32400},
      {text: 't: 20m',    parsed_entry: 1200},
      {text: 't: 09h',    parsed_entry: 32400},
      {text: 'time: 09h', parsed_entry: 32400},
      {text: 'Time: 20m', parsed_entry: 1200}
    ].each do |note|
      context "note with #{note[:text]}" do
        subject { Note.new(text: note[:text]) }

        describe '#time_entry?' do
          it { subject.time_entry?.should be_true }
        end

        describe '#time_entry' do
          it { subject.time_entry.should eql(note[:parsed_entry]) }
        end
      end
    end

in note.rb

def time_entry?
text.downcase.start_with?('time:', 't:')
end

def time_entry
if match = text.match(/^(t|time):(\s+)?((?\d+h)?)((?\d+m)?)$/i)
(match[:minute].to_i * 60) + (match[:hour].to_i * 3600)
end
end