setpayload: Add tests.

* tests/test-setpayload.c: New file.
* modules/setpayload-tests: New file.

ChangeLog

@@ -1,5 +1,9 @@
 2024-04-16  Bruno Haible  <bruno@clisp.org>
 
+	setpayload: Add tests.
+	* tests/test-setpayload.c: New file.
+	* modules/setpayload-tests: New file.
+
 	setpayload: New module.
 	* lib/math.in.h (setpayload): New declaration.
 	* lib/setpayload.c: New file.

modules/setpayload-tests

@@ -0,0 +1,15 @@
+Files:
+tests/test-setpayload.c
+tests/infinity.h
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+isnand-nolibm
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-setpayload
+check_PROGRAMS += test-setpayload
+test_setpayload_LDADD = $(LDADD) @SETPAYLOAD_LIBM@

tests/test-setpayload.c

@@ -0,0 +1,86 @@
+/* Test setpayload.
+   Copyright 2024 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 <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <math.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (setpayload, int, (double *, double));
+
+#include "infinity.h"
+#include "isnand-nolibm.h"
+#include "macros.h"
+
+int
+main ()
+{
+  int i;
+  double p;
+
+  {
+    /* Test valid payloads.  */
+    for (i = 0, p = 1.0; i < 53 - 2; i++, p *= 2.0)
+      {
+        int ret;
+        double x;
+
+        ret = setpayload (&x, p);
+        ASSERT (ret == 0);
+        ASSERT (isnand (x));
+      }
+    /* Test out-of-range payload.  */
+    int ret;
+    double x;
+
+    ret = setpayload (&x, p);
+    ASSERT (ret != 0);
+    ASSERT (x == 0.0);
+  }
+
+  /* Test infinite payload.  */
+  {
+    int ret;
+    double x;
+
+    ret = setpayload (&x, Infinityd ());
+    ASSERT (ret != 0);
+    ASSERT (x == 0.0);
+  }
+
+  /* Test negative payload.  */
+  {
+    int ret;
+    double x;
+
+    ret = setpayload (&x, -1.0);
+    ASSERT (ret != 0);
+    ASSERT (x == 0.0);
+  }
+
+  /* Test fractional payload.  */
+  {
+    int ret;
+    double x;
+
+    ret = setpayload (&x, 1.4);
+    ASSERT (ret != 0);
+    ASSERT (x == 0.0);
+  }
+
+  return 0;
+}