Dockerfile

FROM ubuntu:18.04

RUN apt update && \
  apt install gcc make ruby tmux -y && \
  gem install ttytest

# have to change lib because of version
ENV RUBYOPT="-KU -E utf-8:utf-8"
WORKDIR "/var/lib/gems/2.5.0/gems/ttytest-0.5.0/lib/ttytest"
RUN sed 's/def assert_cursor_position(x:, y:)/def assert_cursor_position(x, y)/' \
  matchers.rb > \
  matchers.rb.changed && \
  mv matchers.rb.changed matchers.rb
RUN touch /home/very_long_filename_to_test_shell_behavior
RUN touch /home/short_file
RUN touch /bin/very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_very_long_filename_to_test_shell_behavior
RUN touch ~/.pshrc

WORKDIR "/pshell"
ENTRYPOINT [ "/bin/bash", "-l", "-c" ]