git reset --hard master >/dev/null 2>&1
'
-test_expect_success 'temporary filenames are used with mergetool.writeToTemp' '
+test_lazy_prereq MKTEMP '
+ tempdir=$(mktemp -d -t foo.XXXXXX) &&
+ test -d "$tempdir"
+'
+
+test_expect_success MKTEMP 'temporary filenames are used with mergetool.writeToTemp' '
git checkout -b test16 branch1 &&
test_config mergetool.writeToTemp true &&
test_config mergetool.myecho.cmd "echo \"\$LOCAL\"" &&