diff --git a/xo-expression2/utest/CMakeLists.txt b/xo-expression2/utest/CMakeLists.txt
index aefc8c8c..687c75ab 100644
--- a/xo-expression2/utest/CMakeLists.txt
+++ b/xo-expression2/utest/CMakeLists.txt
@@ -6,6 +6,7 @@ set(UTEST_SRCS
     StringTable.test.cpp
     X1Collector.test.cpp
     DConstant.test.cpp
+    DVariable.test.cpp
 )
 
 xo_add_utest_executable(${UTEST_EXE} ${UTEST_SRCS})
diff --git a/xo-expression2/utest/DVariable.test.cpp b/xo-expression2/utest/DVariable.test.cpp
new file mode 100644
index 00000000..8afee360
--- /dev/null
+++ b/xo-expression2/utest/DVariable.test.cpp
@@ -0,0 +1,227 @@
+/** @file DVariable.test.cpp
+ *
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#include "init_expression2.hpp"
+#include <xo/expression2/DVariable.hpp>
+#include <xo/expression2/detail/IExpression_DVariable.hpp>
+#include <xo/expression2/detail/IPrintable_DVariable.hpp>
+#include <xo/expression2/StringTable.hpp>
+
+#include <xo/gc/CollectorTypeRegistry.hpp>
+#include <xo/gc/DX1Collector.hpp>
+#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
+#include <xo/gc/detail/ICollector_DX1Collector.hpp>
+
+#include <xo/printable2/Printable.hpp>
+#include <xo/facet/FacetRegistry.hpp>
+#include <xo/reflect/Reflect.hpp>
+
+#include <xo/indentlog/scope.hpp>
+
+#include <catch2/catch.hpp>
+
+#include <sstream>
+#include <cstring>
+
+namespace ut {
+    using xo::S_expression2_tag;
+    using xo::scm::DVariable;
+    using xo::scm::DUniqueString;
+    using xo::scm::StringTable;
+    using xo::scm::TypeRef;
+    using xo::scm::Binding;
+    using xo::scm::AExpression;
+    using xo::mm::CollectorTypeRegistry;
+    using xo::mm::AAllocator;
+    using xo::mm::ACollector;
+    using xo::mm::DX1Collector;
+    using xo::mm::CollectorConfig;
+    using xo::mm::ArenaConfig;
+    using xo::print::APrintable;
+    using xo::print::ppstate_standalone;
+    using xo::print::ppconfig;
+    using xo::facet::FacetRegistry;
+    using xo::facet::with_facet;
+    using xo::facet::obj;
+    using xo::reflect::Reflect;
+    using xo::InitEvidence;
+    using xo::InitSubsys;
+    using xo::scope;
+
+    static InitEvidence s_init = InitSubsys<S_expression2_tag>::require();
+
+    TEST_CASE("DVariable-init", "[expression2][DVariable]")
+    {
+        REQUIRE(s_init.evidence());
+    }
+
+    TEST_CASE("DVariable-make", "[expression2][DVariable]")
+    {
+        REQUIRE(s_init.evidence());
+
+        CollectorConfig cfg{
+            .name_ = "dvariable_make_test",
+            .arena_config_ = ArenaConfig{
+                .size_ = 8192,
+                .store_header_flag_ = true},
+            .object_types_z_ = 16384,
+            .gc_trigger_v_{{4096, 4096}},
+            .debug_flag_ = false,
+        };
+
+        DX1Collector gc(cfg);
+        auto alloc = with_facet<AAllocator>::mkobj(&gc);
+        auto coll = with_facet<ACollector>::mkobj(&gc);
+
+        bool ok = CollectorTypeRegistry::instance().install_types(coll);
+        REQUIRE(ok);
+
+        StringTable table(1024);
+        const DUniqueString * name = table.intern("x");
+        REQUIRE(name != nullptr);
+
+        TypeRef typeref = TypeRef::resolved(Reflect::require<double>());
+
+        DVariable * var = DVariable::make(alloc, name, typeref);
+        REQUIRE(var != nullptr);
+    }
+
+    TEST_CASE("DVariable-extype", "[expression2][DVariable]")
+    {
+        REQUIRE(s_init.evidence());
+
+        CollectorConfig cfg{
+            .name_ = "dvariable_extype_test",
+            .arena_config_ = ArenaConfig{
+                .size_ = 8192,
+                .store_header_flag_ = true},
+            .object_types_z_ = 16384,
+            .gc_trigger_v_{{4096, 4096}},
+            .debug_flag_ = false,
+        };
+
+        DX1Collector gc(cfg);
+        auto alloc = with_facet<AAllocator>::mkobj(&gc);
+        auto coll = with_facet<ACollector>::mkobj(&gc);
+
+        bool ok = CollectorTypeRegistry::instance().install_types(coll);
+        REQUIRE(ok);
+
+        StringTable table(1024);
+        const DUniqueString * name = table.intern("y");
+        TypeRef typeref = TypeRef::resolved(Reflect::require<long>());
+
+        DVariable * var = DVariable::make(alloc, name, typeref);
+        REQUIRE(var != nullptr);
+        REQUIRE(var->extype() == xo::scm::exprtype::variable);
+    }
+
+    TEST_CASE("DVariable-valuetype", "[expression2][DVariable]")
+    {
+        REQUIRE(s_init.evidence());
+
+        CollectorConfig cfg{
+            .name_ = "dvariable_valuetype_test",
+            .arena_config_ = ArenaConfig{
+                .size_ = 8192,
+                .store_header_flag_ = true},
+            .object_types_z_ = 16384,
+            .gc_trigger_v_{{4096, 4096}},
+            .debug_flag_ = false,
+        };
+
+        DX1Collector gc(cfg);
+        auto alloc = with_facet<AAllocator>::mkobj(&gc);
+        auto coll = with_facet<ACollector>::mkobj(&gc);
+
+        bool ok = CollectorTypeRegistry::instance().install_types(coll);
+        REQUIRE(ok);
+
+        StringTable table(1024);
+        const DUniqueString * name = table.intern("z");
+        TypeRef typeref = TypeRef::resolved(Reflect::require<double>());
+
+        DVariable * var = DVariable::make(alloc, name, typeref);
+        REQUIRE(var != nullptr);
+        REQUIRE(var->valuetype() == Reflect::require<double>());
+    }
+
+    TEST_CASE("DVariable-name", "[expression2][DVariable]")
+    {
+        REQUIRE(s_init.evidence());
+
+        CollectorConfig cfg{
+            .name_ = "dvariable_name_test",
+            .arena_config_ = ArenaConfig{
+                .size_ = 8192,
+                .store_header_flag_ = true},
+            .object_types_z_ = 16384,
+            .gc_trigger_v_{{4096, 4096}},
+            .debug_flag_ = false,
+        };
+
+        DX1Collector gc(cfg);
+        auto alloc = with_facet<AAllocator>::mkobj(&gc);
+        auto coll = with_facet<ACollector>::mkobj(&gc);
+
+        bool ok = CollectorTypeRegistry::instance().install_types(coll);
+        REQUIRE(ok);
+
+        StringTable table(1024);
+        const DUniqueString * name = table.intern("myvar");
+        TypeRef typeref = TypeRef::resolved(Reflect::require<double>());
+
+        DVariable * var = DVariable::make(alloc, name, typeref);
+        REQUIRE(var != nullptr);
+        REQUIRE(var->name() == name);
+        REQUIRE(std::strcmp(var->name()->chars(), "myvar") == 0);
+    }
+
+    TEST_CASE("DVariable-pretty", "[expression2][DVariable][pp]")
+    {
+        scope log(XO_DEBUG(false));
+
+        REQUIRE(s_init.evidence());
+
+        CollectorConfig cfg{
+            .name_ = "dvariable_pretty_test",
+            .arena_config_ = ArenaConfig{
+                .size_ = 8192,
+                .store_header_flag_ = true},
+            .object_types_z_ = 16384,
+            .gc_trigger_v_{{4096, 4096}},
+            .debug_flag_ = false,
+        };
+
+        DX1Collector gc(cfg);
+        auto alloc = with_facet<AAllocator>::mkobj(&gc);
+        auto coll = with_facet<ACollector>::mkobj(&gc);
+
+        bool ok = CollectorTypeRegistry::instance().install_types(coll);
+        REQUIRE(ok);
+
+        StringTable table(1024);
+        const DUniqueString * name = table.intern("foo");
+        TypeRef typeref = TypeRef::resolved(Reflect::require<double>());
+
+        DVariable * var = DVariable::make(alloc, name, typeref);
+        REQUIRE(var != nullptr);
+
+        std::stringstream ss;
+        ppconfig ppc;
+        ppstate_standalone pps(&ss, 0, &ppc);
+
+        obj<APrintable,DVariable> var_pr(var);
+        pps.pretty(var_pr);
+
+        std::string output = ss.str();
+
+        log && log(output);
+
+        CHECK(output.find("DVariable") != std::string::npos);
+    }
+}
+
+/* end DVariable.test.cpp */