This is a sample of a tmux script that can be used to create an environment with a long running command on the left (like a test runner) and on the right vim opened

tmux-run-and-edit

#!/usr/bin/env bash
# vim: ft=sh
SESSION_NAME=${SESSION_NAME-default}
COMMAND=${COMMAND-''}

show_usage() {
  echo -e "Usage: $0 <directory>\n"
  echo -e "\tOptions as environment variables"
  echo -e "\t\tSESSION_NAME: name of tmux session (allows for reattach)"
  echo -e "\t\tCOMMAND: command to run in command window (left pane)"
}

if [[ $# != 1 ]]; then
  echo "Missing required argument"
  show_usage
  exit 1
else
  DIRECTORY=$1
fi

if [ ! -d "$DIRECTORY" ]; then
  echo "Directory does not exist"
  show_usage
  exit 2
fi

pushd $DIRECTORY >> /dev/null

# Create the session disconnected
# This gives us a single window with a single pane
tmux new-session -s "$SESSION_NAME" -n "$SESSION_NAME" -d
tmux send-keys $COMMAND C-m

# Create the second pane with it taking 80% of the screen
#  this is the pane that will have vim running
tmux split-window -h -p 80
tmux send-keys vim C-m
# Below line can be uncommented if you want nerdtree to show on vim launch (uses Ctrl+e)
#tmux send-keys C-e

# Attach to Session
tmux attach-session -t "$SESSION_NAME"

popd >> /dev/null

exit 0