1 files changed, 33 insertions, 0 deletions
diff --git a/src/test/isolation/specs/read-write-unique-3.spec b/src/test/isolation/specs/read-write-unique-3.spec
new file mode 100644
index 00000000000..52d287721b1
--- /dev/null
+++ b/src/test/isolation/specs/read-write-unique-3.spec
@@ -0,0 +1,33 @@
+# Read-write-unique test.
+# From bug report 9301.
+
+setup
+{
+  CREATE TABLE test (
+    key   integer UNIQUE,
+    val   text
+  );
+
+  CREATE OR REPLACE FUNCTION insert_unique(k integer, v text) RETURNS void
+  LANGUAGE SQL AS $$
+    INSERT INTO test (key, val) SELECT k, v WHERE NOT EXISTS (SELECT key FROM test WHERE key = k);
+  $$;
+}
+
+teardown
+{
+  DROP FUNCTION insert_unique(integer, text);
+  DROP TABLE test;
+}
+
+session "s1"
+setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step "rw1" { SELECT insert_unique(1, '1'); }
+step "c1" { COMMIT; }
+
+session "s2"
+setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step "rw2" { SELECT insert_unique(1, '2'); }
+step "c2" { COMMIT; }
+
+permutation "rw1" "rw2" "c1" "c2"