Progress.

test/PrimitiveWrapper_test.cpp

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+#include <doctest/doctest.h>
+
+#include <hdk/grid/PrimitiveWrapper.hpp>
+
+TEST_CASE("PrimitiveWrapper stores and exposes primitive values") {
+  hdk::grid::PrimitiveWrapper<int> wrapped(7);
+  CHECK(static_cast<int>(wrapped) == 7);
+
+  wrapped = 42;
+  CHECK(static_cast<int>(wrapped) == 42);
+}
+
+TEST_CASE("PrimitiveWrapper assignment returns self for chaining") {
+  hdk::grid::PrimitiveWrapper<int> wrapped(1);
+  auto& ref = (wrapped = 9);
+  CHECK(&ref == &wrapped);
+  CHECK(static_cast<int>(wrapped) == 9);
+}