diff --git a/makefile b/makefile
index 00c1852..2b18982 100644
--- a/makefile
+++ b/makefile
@@ -53,6 +53,7 @@ results:
# tests
test: M2-Mesoplanet
./test/test0000/run_test.sh
+ ./test/test0001/run_test.sh
# sha256sum -c test/test.answers
diff --git a/test/test0001/proof.answer b/test/test0001/proof.answer
new file mode 100644
index 0000000..ddb5ddc
--- /dev/null
+++ b/test/test0001/proof.answer
@@ -0,0 +1 @@
+ba1d093813d679dacfe729dab1bdb8d11df35ff85b7d476ed23738972842157d test/test0001/tmp/return.c
diff --git a/test/test0001/return.c b/test/test0001/return.c
new file mode 100644
index 0000000..3788387
--- /dev/null
+++ b/test/test0001/return.c
@@ -0,0 +1,23 @@
+/* Copyright (C) 2016 Jeremiah Orians
+ * This file is part of M2-Planet.
+ *
+ * M2-Planet is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * M2-Planet is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with M2-Planet. If not, see .
+ */
+
+#define answer 42
+
+int main()
+{
+ return answer;
+}
diff --git a/test/test0001/run_test.sh b/test/test0001/run_test.sh
new file mode 100755
index 0000000..d84dc22
--- /dev/null
+++ b/test/test0001/run_test.sh
@@ -0,0 +1,32 @@
+#! /bin/sh
+## Copyright (C) 2017 Jeremiah Orians
+## Copyright (C) 2020-2021 deesix
+## This file is part of M2-Planet.
+##
+## M2-Planet is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## M2-Planet is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with M2-Planet. If not, see .
+
+set -x
+
+TMPDIR="test/test0001/tmp"
+
+mkdir -p ${TMPDIR}
+
+# Build the test
+bin/M2-Mesoplanet \
+ -f test/test0001/return.c \
+ -o ${TMPDIR}/return.c \
+ || exit 1
+
+sha256sum -c test/test0001/proof.answer || exit 2
+exit 0