--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2012-03-11  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'log2f'.
+	* modules/log2f-tests: New file.
+	* tests/test-log2f.c: New file.
+
 	New module 'log2f'.
 	* lib/math.in.h (log2f): New declaration.
 	* lib/log2f.c: New file.

new file mode 100644
--- /dev/null
+++ b/modules/log2f-tests
@@ -0,0 +1,17 @@
+Files:
+tests/test-log2f.c
+tests/test-log2.h
+tests/minus-zero.h
+tests/signature.h
+tests/macros.h
+tests/randomf.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-log2f
+check_PROGRAMS += test-log2f
+test_log2f_SOURCES = test-log2f.c randomf.c
+test_log2f_LDADD = $(LDADD) @LOG2F_LIBM@

new file mode 100644
--- /dev/null
+++ b/tests/test-log2f.c
@@ -0,0 +1,53 @@
+/* Test of log2f() function.
+   Copyright (C) 2010-2012 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/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2012.  */
+
+#include <config.h>
+
+#include <math.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (log2f, float, (float));
+
+#include <float.h>
+
+#include "minus-zero.h"
+#include "macros.h"
+
+#define DOUBLE float
+#define HUGEVAL HUGE_VALF
+#define L_(literal) literal##f
+#define MANT_DIG FLT_MANT_DIG
+#define MAX_EXP FLT_MAX_EXP
+#define MIN_EXP FLT_MIN_EXP
+#define MINUS_ZERO minus_zerof
+#define LOG2 log2f
+#define RANDOM randomf
+#include "test-log2.h"
+
+int
+main ()
+{
+  /* A particular value.  */
+  x = 0.6f;
+  y = log2f (x);
+  ASSERT (y >= -0.73697f && y <= -0.73696f);
+
+  test_function ();
+
+  return 0;
+}