fabs* tests: More tests.

[gnulib.git] / tests / test-fabs.h

diff --git a/tests/test-fabs.h b/tests/test-fabs.h
new file mode 100644 (file)
index 0000000..a25eaf7
--- /dev/null
+++ b/tests/test-fabs.h
@@ -0,0 +1,48 @@
+/* Test of fabs*() function family.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+static void
+test_function (void)
+{
+  volatile DOUBLE x;
+  DOUBLE y;
+
+  /* Signed zero.  */
+  x = L_(0.0);
+  y = FABS (x);
+  ASSERT (y == L_(0.0));
+  ASSERT (!signbit (y));
+
+  x = MINUS_ZERO;
+  y = FABS (x);
+  ASSERT (y == L_(0.0));
+  ASSERT (!signbit (y));
+
+  /* Randomized tests.  */
+  {
+    int i;
+
+    for (i = 0; i < SIZEOF (RANDOM); i++)
+      {
+        x = L_(10.0) * RANDOM[i]; /* 0.0 <= x <= 10.0 */
+        ASSERT (FABS (x) == x);
+        ASSERT (FABS (- x) == x);
+      }
+  }
+}
+
+volatile DOUBLE x;
+DOUBLE y;