Watch for changes in files (code and tests) and run phpunit tests whenever changes are detected. Althought is not needed, I recommend to use a phpunit.xml configuration file.

tdd

#!/bin/bash

if [ $# -ne 1 ]; then
    echo "Usage: $0 CODE-DIRECTORY"
    exit 1
fi

code_directory=$1

if [ ! -d $code_directory ]; then
    echo "Error: invalid dir $code_directory"
    exit 1
fi

while inotifywait -qq -e close_write -r $code_directory --exclude=".*sw[px]"; do
    clear && phpunit $code_directory
done