diff options
Diffstat (limited to 'stdlib')
| -rw-r--r-- | stdlib/Makefile | 1 | ||||
| -rw-r--r-- | stdlib/tst-rand-sequence.c | 57 |
2 files changed, 58 insertions, 0 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile index 18a19f4..a5fbc1a 100644 --- a/stdlib/Makefile +++ b/stdlib/Makefile @@ -296,6 +296,7 @@ tests := \ tst-qsort3 \ tst-qsort6 \ tst-quick_exit \ + tst-rand-sequence \ tst-rand48 \ tst-rand48-2 \ tst-random \ diff --git a/stdlib/tst-rand-sequence.c b/stdlib/tst-rand-sequence.c new file mode 100644 index 0000000..4691dfd --- /dev/null +++ b/stdlib/tst-rand-sequence.c @@ -0,0 +1,57 @@ +/* Test that rand () evaluates to a special expected sequence. + Copyright (C) 2025 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +/* This test is borderline invalid because the rand function is not + guaranteed to produce the same sequence of numbers on every + architecture or glibc build. However, some software packages have + test suites that depend on the specific sequence of numbers return + here, so this test verifies that they do not change unexpectedly. */ + +#include <stdlib.h> +#include <support/check.h> + +static int +do_test (void) +{ + TEST_COMPARE (rand (), 1804289383); + TEST_COMPARE (rand (), 846930886); + TEST_COMPARE (rand (), 1681692777); + TEST_COMPARE (rand (), 1714636915); + TEST_COMPARE (rand (), 1957747793); + TEST_COMPARE (rand (), 424238335); + TEST_COMPARE (rand (), 719885386); + TEST_COMPARE (rand (), 1649760492); + TEST_COMPARE (rand (), 596516649); + TEST_COMPARE (rand (), 1189641421); + + srand (1009); + TEST_COMPARE (rand (), 176208083); + TEST_COMPARE (rand (), 1650100842); + TEST_COMPARE (rand (), 1813188575); + TEST_COMPARE (rand (), 2064804480); + TEST_COMPARE (rand (), 1944264725); + TEST_COMPARE (rand (), 1673642853); + TEST_COMPARE (rand (), 1582759448); + TEST_COMPARE (rand (), 309901569); + TEST_COMPARE (rand (), 444031692); + TEST_COMPARE (rand (), 1926035991); + + return 0; +} + +#include <support/test-driver.c> |