1 files changed, 139 insertions, 0 deletions
diff --git a/host/tests/rate_node_test.cpp b/host/tests/rate_node_test.cpp
new file mode 100644
index 000000000..2e17c02a5
--- /dev/null
+++ b/host/tests/rate_node_test.cpp
@@ -0,0 +1,139 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// 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/>.
+//
+
+#include "graph.hpp"
+#include <uhd/rfnoc/rate_node_ctrl.hpp>
+#include <boost/test/unit_test.hpp>
+#include <iostream>
+
+using namespace uhd::rfnoc;
+
+// test class derived, knows about rates
+class rate_aware_node : public test_node, public rate_node_ctrl
+{
+public:
+    typedef boost::shared_ptr<rate_aware_node> sptr;
+
+    rate_aware_node(const std::string &test_id) : test_node(test_id) {};
+
+}; /* class rate_aware_node */
+
+// test class derived, sets rates
+class rate_setting_node : public test_node, public rate_node_ctrl
+{
+public:
+    typedef boost::shared_ptr<rate_setting_node> sptr;
+
+    rate_setting_node(const std::string &test_id, double samp_rate) : test_node(test_id), _samp_rate(samp_rate) {};
+
+    double get_input_samp_rate(size_t) { return _samp_rate; };
+    double get_output_samp_rate(size_t) { return _samp_rate; };
+
+private:
+    double _samp_rate;
+
+}; /* class rate_setting_node */
+
+#define MAKE_RATE_NODE(name) rate_aware_node::sptr name(new rate_aware_node(#name));
+#define MAKE_RATE_SETTING_NODE(name, rate) rate_setting_node::sptr name(new rate_setting_node(#name, rate));
+
+BOOST_AUTO_TEST_CASE(test_simplest_downstream_search)
+{
+    const double test_rate = 0.25;
+    MAKE_RATE_NODE(node_A);
+    MAKE_RATE_SETTING_NODE(node_B, test_rate);
+
+    // Simplest possible scenario: Connect B downstream of A and let
+    // it find B
+    connect_nodes(node_A, node_B);
+
+    double result_rate = node_A->get_input_samp_rate();
+    BOOST_CHECK_EQUAL(result_rate, test_rate);
+}
+
+BOOST_AUTO_TEST_CASE(test_skip_downstream_search)
+{
+    const double test_rate = 0.25;
+    MAKE_RATE_NODE(node_A);
+    MAKE_NODE(node_B);
+    MAKE_RATE_SETTING_NODE(node_C, test_rate);
+
+    // Slightly more elaborate: Add another block in between that has no
+    // clue about rates
+    connect_nodes(node_A, node_B);
+    connect_nodes(node_B, node_C);
+
+    double result_rate = node_A->get_input_samp_rate();
+    BOOST_CHECK_EQUAL(result_rate, test_rate);
+}
+
+BOOST_AUTO_TEST_CASE(test_tree_downstream_search)
+{
+    const double test_rate = 0.25;
+    MAKE_RATE_NODE(node_A);
+    MAKE_NODE(node_B0);
+    MAKE_RATE_SETTING_NODE(node_B1, test_rate);
+    MAKE_RATE_SETTING_NODE(node_C0, test_rate);
+    MAKE_RATE_SETTING_NODE(node_C1, rate_node_ctrl::RATE_UNDEFINED);
+
+    // Tree: Downstream of our first node are 3 rate setting blocks.
+    // Two set the same rate, the third does not care.
+    connect_nodes(node_A, node_B0);
+    connect_nodes(node_A, node_B1);
+    connect_nodes(node_B0, node_C0);
+    connect_nodes(node_B0, node_C1);
+
+    double result_rate = node_A->get_input_samp_rate();
+    BOOST_CHECK_EQUAL(result_rate, test_rate);
+}
+
+BOOST_AUTO_TEST_CASE(test_tree_downstream_search_throw)
+{
+    const double test_rate = 0.25;
+    MAKE_RATE_NODE(node_A);
+    MAKE_NODE(node_B0);
+    MAKE_RATE_SETTING_NODE(node_B1, test_rate);
+    MAKE_RATE_SETTING_NODE(node_C0, test_rate);
+    MAKE_RATE_SETTING_NODE(node_C1, test_rate * 2);
+
+    // Tree: Downstream of our first node are 3 rate setting blocks.
+    // Two set the same rate, the third has a different rate.
+    // This will cause a throw.
+    connect_nodes(node_A, node_B0);
+    connect_nodes(node_A, node_B1);
+    connect_nodes(node_B0, node_C0);
+    connect_nodes(node_B0, node_C1);
+
+    BOOST_CHECK_THROW(node_A->get_input_samp_rate(), uhd::runtime_error);
+}
+
+BOOST_AUTO_TEST_CASE(test_skip_upstream_search)
+{
+    const double test_rate = 0.25;
+    MAKE_RATE_SETTING_NODE(node_A, test_rate);
+    MAKE_NODE(node_B);
+    MAKE_RATE_NODE(node_C);
+
+    // Slightly more elaborate: Add another block in between that has no
+    // clue about rates
+    connect_nodes(node_A, node_B);
+    connect_nodes(node_B, node_C);
+
+    double result_rate = node_C->get_output_samp_rate();
+    BOOST_CHECK_EQUAL(result_rate, test_rate);
+}
+