xvfb-run

Run a command in a virtual X server environment. More information: https://www.x.org/wiki/.

• Run the specified command in a virtual X server:
  xvfb-run {{command}}
• Try to get a free server number, if the default (99) is not available:
  xvfb-run --auto-servernum {{command}}
• Pass arguments to the Xvfb server:
  xvfb-run --server-args "{{-screen 0 1024x768x24}}" {{command}}