diff --git a/CMakeLists.txt b/CMakeLists.txt
index 929c48b..04751f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,7 @@ xo_add_genfacetimpl(
 )
 
 add_subdirectory(src/procedure2)
-#add_subdirectory(utest)
+add_subdirectory(utest)
 
 # ----------------------------------------------------------------
 
diff --git a/utest/CMakeLists.txt b/utest/CMakeLists.txt
new file mode 100644
index 0000000..2e5f147
--- /dev/null
+++ b/utest/CMakeLists.txt
@@ -0,0 +1,11 @@
+# built unittest xo-procedure2/utest
+
+set(UTEST_EXE utest.procedure2)
+set(UTEST_SRCS
+    procedure2_utest_main.cpp
+    DPrimitive.test.cpp
+)
+
+xo_add_utest_executable(${UTEST_EXE} ${UTEST_SRCS})
+xo_self_dependency(${UTEST_EXE} xo_procedure2)
+xo_external_target_dependency(${UTEST_EXE} Catch2 Catch2::Catch2)
diff --git a/utest/DPrimitive.test.cpp b/utest/DPrimitive.test.cpp
new file mode 100644
index 0000000..db501da
--- /dev/null
+++ b/utest/DPrimitive.test.cpp
@@ -0,0 +1,35 @@
+/** @file DPrimitive.test.cpp
+ *
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#include <xo/procedure2/init_procedure2.hpp>
+#include <xo/procedure2/init_primitives.hpp>
+#include <catch2/catch.hpp>
+
+namespace xo {
+    using xo::scm::Primitives;
+
+    namespace ut {
+        static InitEvidence s_init = InitSubsys<S_procedure2_tag>::require();
+
+        TEST_CASE("DPrimitive-init", "[procedure2][DPrimitive]")
+        {
+            REQUIRE(s_init.evidence());
+        }
+
+        TEST_CASE("DPrimitive-n_args", "[procedure2][DPrimitive]")
+        {
+            // s_mul_gco_gco_pm takes 2 AGCObject args
+            REQUIRE(Primitives::s_mul_gco_gco_pm.n_args() == 2);
+        }
+
+        TEST_CASE("DPrimitive-is_nary", "[procedure2][DPrimitive]")
+        {
+            REQUIRE(Primitives::s_mul_gco_gco_pm.is_nary() == false);
+        }
+
+    } /*namespace ut*/
+} /*namespace xo*/
+
+/* end DPrimitive.test.cpp */
diff --git a/utest/procedure2_utest_main.cpp b/utest/procedure2_utest_main.cpp
new file mode 100644
index 0000000..477099b
--- /dev/null
+++ b/utest/procedure2_utest_main.cpp
@@ -0,0 +1,20 @@
+/* file procedure2_utest_main.cpp */
+
+#include <xo/subsys/Subsystem.hpp>
+
+#define CATCH_CONFIG_RUNNER
+#include "catch2/catch.hpp"
+
+int
+main(int argc, char* argv[])
+{
+    using xo::Subsystem;
+
+    Subsystem::initialize_all();
+
+    int result = Catch::Session().run(argc, argv);
+
+    return result;
+}
+
+/* end procedure2_utest_main.cpp */