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diff --git a/gr-howto-write-a-block/lib/qa_square2_ff.cc b/gr-howto-write-a-block/lib/qa_square2_ff.cc
new file mode 100644
index 0000000000..672e75691b
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+++ b/gr-howto-write-a-block/lib/qa_square2_ff.cc
@@ -0,0 +1,63 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2011,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "qa_square2_ff.h"
+#include <cppunit/TestAssert.h>
+
+#include <vector>
+#include <gr_top_block.h>
+#include <gr_vector_source_f.h>
+#include <gr_vector_sink_f.h>
+#include <howto/square2_ff.h>
+
+namespace gr {
+  namespace howto {
+    
+    void
+    qa_square2_ff::t1()
+    {
+      std::vector<float> data(5,0);
+      std::vector<float> result(5,0);
+      std::vector<float> output(5,0);
+      for(size_t i = 0; i < data.size(); i++) {
+	data[i] = i;
+	result[i] = i*i;
+      }
+      
+      gr_top_block_sptr tb = gr_make_top_block("dial_tone");
+      gr_vector_source_f_sptr src = gr_make_vector_source_f(data);
+      gr_vector_sink_f_sptr snk = gr_make_vector_sink_f();
+
+      square2_ff::sptr op = square2_ff::make();
+      
+      tb->connect(src, 0, op, 0);
+      tb->connect(op, 0, snk, 0);
+      tb->run();
+
+      output = snk->data();
+      
+      for(size_t i = 0; i < data.size(); i++) {
+	CPPUNIT_ASSERT_DOUBLES_EQUAL(output[i], result[i], 0.0001);
+      }
+    }
+
+  } /* namespace howto */
+} /* namespace gr */