[Tests] ignore travis-ci env vars; improve debug output

test/fast/Running 'nvm unload' should unset all function and variables

@@ -9,7 +9,7 @@ cleanup () { rm -f "${BEFORE}" "${AFTER}"; }
 die () { echo "$@" ; cleanup ; exit 1; }
 
 typeset -f | awk '/ \(\) $/ && !/^main / {print $1}' > "${BEFORE}"
-env | grep -v PATH= | grep -v IFS= | grep -v NVM_ | sort >> "${BEFORE}"
+env | grep -v PATH= | grep -v IFS= | grep -v NVM_ | grep -v TRAVIS_ | sort >> "${BEFORE}"
 
 set +e # TODO: fix
 \. ../../nvm.sh
@@ -20,11 +20,11 @@ type nvm > /dev/null 2>&1 || die "nvm not loaded"
 nvm unload
 
 typeset -f | awk '/ \(\) $/ && !/^main / {print $1}' > "${AFTER}"
-env | grep -v PATH= | grep -v IFS= | sort >> "${AFTER}"
+env | grep -v PATH= | grep -v IFS= | grep -v TRAVIS_ | sort >> "${AFTER}"
 
 ! type nvm > /dev/null 2>&1 || die "nvm not unloaded"
 
 DIFF="$(diff "${BEFORE}" "${AFTER}" ||:)"
-[ -z "${DIFF}" ] || die "function pollution found: ${DIFF}"
+[ -z "${DIFF}" ] || die "function pollution found: >${DIFF}<"
 
 cleanup