1 files changed, 47 insertions, 0 deletions
diff --git a/src/test/isolation/specs/multiple-row-versions.spec b/src/test/isolation/specs/multiple-row-versions.spec
new file mode 100644
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--- /dev/null
+++ b/src/test/isolation/specs/multiple-row-versions.spec
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+# Multiple Row Versions test
+#
+# This test is designed to cover some code paths which only occur with
+# four or more transactions interacting with particular timings.
+#
+# Due to long permutation setup time, we are only testing one specific
+# permutation, which should get a serialization error.
+
+setup
+{
+ CREATE TABLE t (id int NOT NULL, txt text) WITH (fillfactor=50);
+ INSERT INTO t (id)
+   SELECT x FROM (SELECT * FROM generate_series(1, 1000000)) a(x);
+ ALTER TABLE t ADD PRIMARY KEY (id);
+}
+
+teardown
+{
+ DROP TABLE t;
+}
+
+session s1
+setup		{ BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step rx1	{ SELECT * FROM t WHERE id = 1000000; }
+# delay until after T3 commits
+step wz1	{ UPDATE t SET txt = 'a' WHERE id = 1; }
+step c1		{ COMMIT; }
+
+session s2
+setup		{ BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step wx2	{ UPDATE t SET txt = 'b' WHERE id = 1000000; }
+step c2		{ COMMIT; }
+
+session s3
+setup		{ BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step wx3	{ UPDATE t SET txt = 'c' WHERE id = 1000000; }
+step ry3	{ SELECT * FROM t WHERE id = 500000; }
+# delay until after T4 commits
+step c3		{ COMMIT; }
+
+session s4
+setup		{ BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step wy4	{ UPDATE t SET txt = 'd' WHERE id = 500000; }
+step rz4	{ SELECT * FROM t WHERE id = 1; }
+step c4		{ COMMIT; }
+
+permutation rx1 wx2 c2 wx3 ry3 wy4 rz4 c4 c3 wz1 c1