Tests for module 'log1pf-ieee'.

[gnulib.git] / tests / test-log1p-ieee.h

diff --git a/tests/test-log1p-ieee.h b/tests/test-log1p-ieee.h
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+/* Test of log1p*() 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)
+{
+  /* [MX] shaded specification in POSIX.  */
+
+  /* Negative arguments.  */
+  ASSERT (ISNAN (LOG1P (- L_(1.00001))));
+  ASSERT (ISNAN (LOG1P (- L_(2.0))));
+  ASSERT (ISNAN (LOG1P (- L_(1000000.0))));
+  ASSERT (ISNAN (LOG1P (- INFINITY)));
+
+  /* NaN.  */
+  ASSERT (ISNAN (LOG1P (NAN)));
+
+  /* Only rational value.  */
+  {
+    DOUBLE z = LOG1P (L_(0.0));
+    ASSERT (z == L_(0.0));
+    ASSERT (!signbit (z));
+  }
+  {
+    DOUBLE z = LOG1P (MINUS_ZERO);
+    ASSERT (z == L_(0.0));
+    ASSERT (!!signbit (z) == !!signbit (MINUS_ZERO));
+  }
+
+  /* Infinity.  */
+  ASSERT (LOG1P (INFINITY) == INFINITY);
+}