tests: Allow custom mock_reg_iface_t in mock block

Allow clients to pass a custom instance of a mock_reg_iface_t for use
with mock_block_container. This is especially useful when a block test
subclasses mock_reg_iface_t to implement specialized behaviors.

1 files changed, 4 insertions, 2 deletions

diff --git a/host/lib/rfnoc/mock_block.cpp b/host/lib/rfnoc/mock_block.cpp
index ee35eae7e..834803bd5 100644
--- a/host/lib/rfnoc/mock_block.cpp
+++ b/host/lib/rfnoc/mock_block.cpp
@@ -18,13 +18,15 @@ uhd::rfnoc::mock_block_container uhd::rfnoc::get_mock_block(const noc_id_t noc_i
     const size_t num_outputs,
     const device_addr_t& args,
     const size_t mtu,
-    const device_type_t device_id)
+    const device_type_t device_id,
+    std::shared_ptr<mock_reg_iface_t> client_reg_iface)
 {
     block_factory_info_t fac_info = factory::get_block_factory(noc_id, device_id);
 
     mock_block_container ret_val;
     ret_val.factory   = fac_info.factory_fn;
-    ret_val.reg_iface = std::make_shared<mock_reg_iface_t>();
+    ret_val.reg_iface = (client_reg_iface) ? client_reg_iface
+                                           : std::make_shared<mock_reg_iface_t>();
     ret_val.tree      = uhd::property_tree::make();
     // Create make args
     ret_val.make_args                   = std::make_unique<noc_block_base::make_args_t>();