mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-01-30 19:00:29 +08:00
Code Issues Packages Projects Releases Wiki Activity

Improve random regression tests to fail less frequently.

Browse Source
This commit is contained in:
Bruce Momjian 2004-03-15 15:46:25 +00:00
parent 98bb1d2085
commit 6812e95a28
2 changed files with 55 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
src/test/regress/expected/random.out
View File

@ -2,34 +2,51 @@
-- RANDOM
-- Test the random function
--
-- count the number of tuples originally
-- count the number of tuples originally, should be 1000
SELECT count(*) FROM onek;
count
-------
1000
(1 row)
-- select roughly 1/10 of the tuples
-- Assume that the "onek" table has 1000 tuples
-- and try to bracket the correct number so we
-- have a regression test which can pass/fail
-- - thomas 1998-08-17
-- pick three random rows, they shouldn't match
(SELECT unique1 AS random
FROM onek ORDER BY random() LIMIT 1)
INTERSECT
(SELECT unique1 AS random
FROM onek ORDER BY random() LIMIT 1)
INTERSECT
(SELECT unique1 AS random
FROM onek ORDER BY random() LIMIT 1);
random
--------
(0 rows)
-- count roughly 1/10 of the tuples
SELECT count(*) AS random INTO RANDOM_TBL
FROM onek WHERE random() < 1.0/10;
-- select again, the count should be different
INSERT INTO RANDOM_TBL (random)
SELECT count(*)
FROM onek WHERE random() < 1.0/10;
-- now test the results for randomness in the correct range
-- select again, the count should be different
INSERT INTO RANDOM_TBL (random)
SELECT count(*)
FROM onek WHERE random() < 1.0/10;
-- select again, the count should be different
INSERT INTO RANDOM_TBL (random)
SELECT count(*)
FROM onek WHERE random() < 1.0/10;
-- now test that they are different counts
SELECT random, count(random) FROM RANDOM_TBL
GROUP BY random HAVING count(random) > 1;
GROUP BY random HAVING count(random) > 3;
random | count
--------+-------
(0 rows)
SELECT random FROM RANDOM_TBL
WHERE random NOT BETWEEN 80 AND 120;
random
--------
SELECT AVG(random) FROM RANDOM_TBL
HAVING AVG(random) NOT BETWEEN 80 AND 120;
avg
-----
(0 rows)

36
src/test/regress/sql/random.sql
View File

@ -3,14 +3,20 @@
-- Test the random function
--
-- count the number of tuples originally
-- count the number of tuples originally, should be 1000
SELECT count(*) FROM onek;
-- select roughly 1/10 of the tuples
-- Assume that the "onek" table has 1000 tuples
-- and try to bracket the correct number so we
-- have a regression test which can pass/fail
-- - thomas 1998-08-17
-- pick three random rows, they shouldn't match
(SELECT unique1 AS random
FROM onek ORDER BY random() LIMIT 1)
INTERSECT
(SELECT unique1 AS random
FROM onek ORDER BY random() LIMIT 1)
INTERSECT
(SELECT unique1 AS random
FROM onek ORDER BY random() LIMIT 1);
-- count roughly 1/10 of the tuples
SELECT count(*) AS random INTO RANDOM_TBL
FROM onek WHERE random() < 1.0/10;
@ -19,10 +25,20 @@ INSERT INTO RANDOM_TBL (random)
SELECT count(*)
FROM onek WHERE random() < 1.0/10;
-- now test the results for randomness in the correct range
-- select again, the count should be different
INSERT INTO RANDOM_TBL (random)
SELECT count(*)
FROM onek WHERE random() < 1.0/10;
-- select again, the count should be different
INSERT INTO RANDOM_TBL (random)
SELECT count(*)
FROM onek WHERE random() < 1.0/10;
-- now test that they are different counts
SELECT random, count(random) FROM RANDOM_TBL
GROUP BY random HAVING count(random) > 1;
GROUP BY random HAVING count(random) > 3;
SELECT random FROM RANDOM_TBL
WHERE random NOT BETWEEN 80 AND 120;
SELECT AVG(random) FROM RANDOM_TBL
HAVING AVG(random) NOT BETWEEN 80 AND 120;