--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-01-18  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'acosl'.
+	* modules/acosl-tests: New file.
+	* tests/test-acosl.c: New file.
+
 	New modules acosl, asinl, atanl, cosl, expl, logl, sinl, sqrtl, tanl.
 	* lib/math.in.h (acosl, asinl, atanl, cosl, expl, logl, sinl, sqrtl,
 	tanl): Use the standard gnulib idiom.
@@ -7,7 +11,7 @@
 	* lib/sinl.c: Likewise.
 	* lib/tanl.c: Don't include trigl.c.
 	(kernel_tanl): Make static.
-	* lib/sincosl.c: Include trig.h first.
+	* lib/sincosl.c: Include trigl.h first.
 	* lib/trigl.c: Likewise.
 	* m4/acosl.m4: New file.
 	* m4/asinl.m4: New file.

new file mode 100644
--- /dev/null
+++ b/modules/acosl-tests
@@ -0,0 +1,14 @@
+Files:
+tests/test-acosl.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+fpucw
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-acosl
+check_PROGRAMS += test-acosl
+test_acosl_LDADD = $(LDADD) @ACOSL_LIBM@

new file mode 100644
--- /dev/null
+++ b/tests/test-acosl.c
@@ -0,0 +1,43 @@
+/* Test of acosl() function.
+   Copyright (C) 2010 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/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2010.  */
+
+#include <config.h>
+
+#include <math.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (acosl, long double, (long double));
+
+#include "fpucw.h"
+#include "macros.h"
+
+long double y;
+
+int
+main ()
+{
+  DECL_LONG_DOUBLE_ROUNDING
+
+  BEGIN_LONG_DOUBLE_ROUNDING ();
+
+  /* A particular value.  */
+  y = acosl (0.6L);
+  ASSERT (y >= 0.9272952180L && y <= 0.9272952181L);
+
+  return 0;
+}