-# dtach(1) provides more capable terminal environment to anything
-# that requires more than dumb terminal...
-[ x"${TERM:-dumb}" = xdumb ] && DTACH_TERM=vt100 || DTACH_TERM=$TERM
+# Set SMART_TERM to vt100 for known dumb/unknown terminal.
+# Otherwise use whatever TERM is currently used so that
+# users' actual TERM environments are being used in tests.
+case ${TERM-} in
+ '' | dumb | unknown )
+ SMART_TERM=vt100 ;;
+ *)
+ SMART_TERM=$TERM ;;
+esac