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diff --git a/tests/make_bitmap.cpp b/tests/make_bitmap.cpp
new file mode 100644
index 0000000..11d2f28
--- /dev/null
+++ b/tests/make_bitmap.cpp
@@ -0,0 +1,57 @@
+/* make_bitmap.cpp
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * make_bitmap
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <iostream>
+#include <cstring>
+#include <cstdlib>
+#include <basics.h>
+#include <cmath>
+
+using namespace std;
+
+int main(int argc, char ** argv) {
+	if(argc!=4) {
+		cout << "usage: " << argv[0] << " <bitmap> <length> <ones>" << endl;
+		return 0;
+	}
+	char * fname = argv[1];
+	uint len = atoi(argv[2]);
+	uint ones = atoi(argv[3]);
+	uint * bm = new uint[uint_len(len,1)];
+	for(uint i=0;i<uint_len(len,1);i++)
+		bm[i] = 0;
+	for(uint i=0;i<ones;i++) {
+		while(true) {
+			uint p = rand()%len;
+			if(!bitget(bm,p)) {
+				bitset(bm,p);
+				break;
+			}
+		}
+	}
+	FILE * fp = fopen(fname,"w");
+	uint l = fwrite(&len,sizeof(uint),1,fp);
+	l += fwrite(bm,sizeof(uint),uint_len(len,1),fp);
+	fclose(fp);
+	delete [] bm;
+	return 0;
+}
+