new coverage tests

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2714 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 30 insertions, 1 deletions

diff --git a/tests/ttanh.c b/tests/ttanh.c
index 15e6f5efd..2af3093d7 100644
--- a/tests/ttanh.c
+++ b/tests/ttanh.c
@@ -1,6 +1,6 @@
 /* Test file for mpfr_tanh.
 
-Copyright 2001, 2002, 2003 Free Software Foundation.
+Copyright 2001, 2002, 2003, 2004 Free Software Foundation.
 Adapted from tarctan.c.
 
 This file is part of the MPFR Library.
@@ -28,11 +28,40 @@ MA 02111-1307, USA. */
 #define TEST_FUNCTION mpfr_tanh
 #include "tgeneric.c"
 
+static void
+special (void)
+{
+  mpfr_t x;
+
+  mpfr_init (x);
+
+  mpfr_set_nan (x);
+  mpfr_tanh (x, x, GMP_RNDN);
+  MPFR_ASSERTN(mpfr_nan_p (x));
+
+  mpfr_set_inf (x, 1);
+  mpfr_tanh (x, x, GMP_RNDN);
+  MPFR_ASSERTN(mpfr_cmp_ui (x, 1) == 0);
+
+  mpfr_set_inf (x, -1);
+  mpfr_tanh (x, x, GMP_RNDN);
+  MPFR_ASSERTN(mpfr_cmp_si (x, -1) == 0);
+
+  mpfr_set_prec (x, 10);
+  mpfr_set_str_binary (x, "-0.1001011001");
+  mpfr_tanh (x, x, GMP_RNDN);
+  MPFR_ASSERTN(mpfr_cmp_si_2exp (x, -135, -8) == 0);
+
+  mpfr_clear (x);
+}
+
 int
 main (int argc, char *argv[])
 {
   tests_start_mpfr ();
 
+  special ();
+
   test_generic (2, 100, 100);
 
   tests_end_mpfr ();