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diff --git a/t/apenwarr/260-whichdo/nonexists.do b/t/apenwarr/260-whichdo/nonexists.do
new file mode 100644
index 0000000..9ca1cf5
--- /dev/null
+++ b/t/apenwarr/260-whichdo/nonexists.do
@@ -0,0 +1,45 @@
+exec >&2
+
+# Testing the search path for non-existent do files is a little tricky.
+# We can't be sure where our current directory is, so we don't know how
+# far up the stack redo will need to search.
+#
+# To dodge the problem, let's "cd /" first so that we're testing a target
+# relative to a known location (the root directory).
+
+if [ -e '/default.do' -o \
+     -e '/default.z.do' -o \
+     -e '/default.y.z.do' ]; then
+    echo "Weird: /default.*.do exists; can't run this test."
+    exit 99
+fi
+
+# redo-whichdo *should* fail here, so don't abort the script for that.
+set +e
+a=$(cd / && redo-whichdo __nonexist/a/x.y.z)
+rv=$?
+set -e
+
+if [ "$rv" -eq 0 ]; then
+    echo "redo-whichdo should return nonzero for a missing .do file."
+    exit 10
+fi
+
+b=$(cat <<EOF
+__nonexist/a/x.y.z.do
+__nonexist/a/default.y.z.do
+__nonexist/a/default.z.do
+__nonexist/a/default.do
+__nonexist/default.y.z.do
+__nonexist/default.z.do
+__nonexist/default.do
+default.y.z.do
+default.z.do
+default.do
+EOF
+)
+
+if [ "$a" != "$b" ]; then
+    printf 'redo-whichdo mismatch.\n\ngot:\n%s\n\nexpected:\n%s\n' "$a" "$b"
+    exit 11
+fi