First of all, just follow the linux part of the instructions on the following site:Running unit tests - FlexMojos. Download the flashplayer and untar it some appropriate place and put the absolute directory path in your PATH variable.
Download the xvfb-run script and change the following 'fi'
# If the user did not specify an X authorization file to use, set up a temporary
# directory to house one.
if [ -z "$AUTHFILE" ]; then
XVFB_RUN_TMPDIR="${TMPDIR:-/tmp}/$PROGNAME.$$"
if ! mkdir -p -m 700 "$XVFB_RUN_TMPDIR"; then
error "temporary directory $XVFB_RUN_TMPDIR already exists"
exit 4
fi
AUTHFILE=$(mktemp -p "$XVFB_RUN_TMPDIR" Xauthority)
fi
to
# If the user did not specify an X authorization file to use, set up a temporary
# directory to house one.
if [ -z "$AUTHFILE" ]; then
XVFB_RUN_TMPDIR=$(mktemp -d)
if ! mkdir -p -m 700 "$XVFB_RUN_TMPDIR"; then
error "temporary directory $XVFB_RUN_TMPDIR already exists"
exit 4
fi
AUTHFILE=$(mktemp "$XVFB_RUN_TMPDIR/Xauthority")
fi
I solved my problem, hopefully you will too. Good luck.