--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2012-04-03  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'ilogbf'.
+	* modules/ilogbf-tests: New file.
+	* tests/test-ilogbf.c: New file.
+
 	New module 'ilogbf'.
 	* lib/math.in.h (ilogbf): New declaration.
 	* lib/ilogbf.c: New file.

new file mode 100644
--- /dev/null
+++ b/modules/ilogbf-tests
@@ -0,0 +1,19 @@
+Files:
+tests/test-ilogbf.c
+tests/test-ilogb.h
+tests/minus-zero.h
+tests/infinity.h
+tests/nan.h
+tests/signature.h
+tests/macros.h
+tests/randomf.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-ilogbf
+check_PROGRAMS += test-ilogbf
+test_ilogbf_SOURCES = test-ilogbf.c randomf.c
+test_ilogbf_LDADD = $(LDADD) @ILOGBF_LIBM@

new file mode 100644
--- /dev/null
+++ b/tests/test-ilogbf.c
@@ -0,0 +1,56 @@
+/* Test of ilogbf() function.
+   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/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2012.  */
+
+#include <config.h>
+
+#include <math.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (ilogbf, int, (float));
+
+#include <float.h>
+#include <limits.h>
+
+#include "minus-zero.h"
+#include "infinity.h"
+#include "nan.h"
+#include "macros.h"
+
+#undef INFINITY
+#undef NAN
+
+#define DOUBLE float
+#define VOLATILE volatile
+#define INFINITY Infinityf ()
+#define NAN NaNf ()
+#define L_(literal) literal##f
+#define MINUS_ZERO minus_zerof
+#define MAX_EXP FLT_MAX_EXP
+#define MIN_EXP FLT_MIN_EXP
+#define MIN_NORMAL_EXP FLT_MIN_EXP
+#define ILOGB ilogbf
+#define RANDOM randomf
+#include "test-ilogb.h"
+
+int
+main ()
+{
+  test_function ();
+
+  return 0;
+}