1 files changed, 57 insertions, 0 deletions
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>