Add test_tigetstr_with_error

Author: aycabta

test/reline/test_terminfo.rb

@@ -12,6 +12,10 @@ def test_tigetstr
  omit e.message
  end
 
+ def test_tigetstr_with_error
+ assert_raise(Reline::Terminfo::TerminfoError) { Reline::Terminfo.tigetstr('unknown') }
+ end
+
  def test_tiparm
  assert Reline::Terminfo.tigetstr('khome').tiparm
  rescue Reline::Terminfo::TerminfoError => e