--- ttytest-0.5.0/test/ttytest/terminal_test.rb
+++ ttytest-0.5.0_p/test/ttytest/terminal_test.rb
@@ -4,6 +4,9 @@
   class TerminalTest < Minitest::Test
     def test_shell_hello_world
       @tty = TTYtest.new_terminal(%{PS1='$ ' /bin/sh})
+      # Give tmux some time to settle
+      # (see https://github.com/jhawthorn/ttytest/issues/2):
+      sleep(0.5)
       @tty.assert_row(0, '$')
       @tty.send_keys('echo "Hello, world"')
       @tty.assert_row(0, '$ echo "Hello, world"')