I am uploading a NMU to fix this.
diff -Nru bonnie++-2.00a+nmu1/changelog.txt bonnie++-2.00a+nmu2/changelog.txt
--- bonnie++-2.00a+nmu1/changelog.txt 2023-01-24 19:45:45.000000000 +0100
+++ bonnie++-2.00a+nmu2/changelog.txt 2023-09-29 11:16:17.000000000 +0200
@@ -1,3 +1,11 @@
+bonnie++ (2.00a+nmu2) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Fix syntax error in smoke test. (Closes: #1033582)
+ * Convert to source format 3.0. (Closes: #1036418)
+
+ -- Bastian Germann <b...@debian.org> Fri, 29 Sep 2023 11:16:17 +0200
+
bonnie++ (2.00a+nmu1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru bonnie++-2.00a+nmu1/debian/changelog
bonnie++-2.00a+nmu2/debian/changelog
--- bonnie++-2.00a+nmu1/debian/changelog 2023-01-24 19:45:45.000000000
+0100
+++ bonnie++-2.00a+nmu2/debian/changelog 2023-09-29 11:16:17.000000000
+0200
@@ -1,3 +1,11 @@
+bonnie++ (2.00a+nmu2) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Fix syntax error in smoke test. (Closes: #1033582)
+ * Convert to source format 3.0. (Closes: #1036418)
+
+ -- Bastian Germann <b...@debian.org> Fri, 29 Sep 2023 11:16:17 +0200
+
bonnie++ (2.00a+nmu1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru bonnie++-2.00a+nmu1/debian/source/format
bonnie++-2.00a+nmu2/debian/source/format
--- bonnie++-2.00a+nmu1/debian/source/format 1970-01-01 01:00:00.000000000
+0100
+++ bonnie++-2.00a+nmu2/debian/source/format 2023-09-29 11:16:17.000000000
+0200
@@ -0,0 +1 @@
+3.0 (native)
diff -Nru bonnie++-2.00a+nmu1/debian/tests/smoke
bonnie++-2.00a+nmu2/debian/tests/smoke
--- bonnie++-2.00a+nmu1/debian/tests/smoke 2023-01-24 19:13:48.000000000
+0100
+++ bonnie++-2.00a+nmu2/debian/tests/smoke 2023-09-29 11:16:10.000000000
+0200
@@ -6,5 +6,5 @@
trap "rm -rf $tmpdir" 0 INT QUIT ABRT PIPE TERM
# A minimalist bonnie++ run
-/usr/sbin/bonnie++ -q -u $(id -u) -d "$tmpdir" -s 0 -n 1 > /dev/null; then
+/usr/sbin/bonnie++ -q -u $(id -u) -d "$tmpdir" -s 0 -n 1 > /dev/null
exit $?
