1 files changed, 87 insertions, 0 deletions
diff --git a/gr-digital/python/qa_diff_encoder.py b/gr-digital/python/qa_diff_encoder.py
new file mode 100755
index 000000000..e4f5470af
--- /dev/null
+++ b/gr-digital/python/qa_diff_encoder.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python
+#
+# Copyright 2006,2007,2010,2012 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 GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, gr_unittest
+import digital_swig as digital
+import math
+import random
+
+def make_random_int_tuple(L, min, max):
+    result = []
+    for x in range(L):
+        result.append(random.randint(min, max))
+    return tuple(result)
+
+
+class test_diff_encoder (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+
+    def tearDown (self):
+        self.tb = None
+
+    def test_diff_encdec_000(self):
+        random.seed(0)
+        modulus = 2
+        src_data = make_random_int_tuple(1000, 0, modulus-1)
+        expected_result = src_data
+        src = gr.vector_source_b(src_data)
+        enc = digital.diff_encoder_bb(modulus)
+        dec = digital.diff_decoder_bb(modulus)
+        dst = gr.vector_sink_b()
+        self.tb.connect(src, enc, dec, dst)
+        self.tb.run()               # run the graph and wait for it to finish
+        actual_result = dst.data()  # fetch the contents of the sink
+        self.assertEqual(expected_result, actual_result)
+
+    def test_diff_encdec_001(self):
+        random.seed(0)
+        modulus = 4
+        src_data = make_random_int_tuple(1000, 0, modulus-1)
+        expected_result = src_data
+        src = gr.vector_source_b(src_data)
+        enc = digital.diff_encoder_bb(modulus)
+        dec = digital.diff_decoder_bb(modulus)
+        dst = gr.vector_sink_b()
+        self.tb.connect(src, enc, dec, dst)
+        self.tb.run()               # run the graph and wait for it to finish
+        actual_result = dst.data()  # fetch the contents of the sink
+        self.assertEqual(expected_result, actual_result)
+
+    def test_diff_encdec_002(self):
+        random.seed(0)
+        modulus = 8
+        src_data = make_random_int_tuple(40000, 0, modulus-1)
+        expected_result = src_data
+        src = gr.vector_source_b(src_data)
+        enc = digital.diff_encoder_bb(modulus)
+        dec = digital.diff_decoder_bb(modulus)
+        dst = gr.vector_sink_b()
+        self.tb.connect(src, enc, dec, dst)
+        self.tb.run()               # run the graph and wait for it to finish
+        actual_result = dst.data()  # fetch the contents of the sink
+        self.assertEqual(expected_result, actual_result)
+
+if __name__ == '__main__':
+    gr_unittest.run(test_diff_encoder, "test_diff_encoder.xml")
+