diff --git a/tests/unit/kernel/cellTypesTest.cc b/tests/unit/kernel/cellTypesTest.cc
new file mode 100644
index 000000000..1743ef7a0
--- /dev/null
+++ b/tests/unit/kernel/cellTypesTest.cc
@@ -0,0 +1,37 @@
+#include <gtest/gtest.h>
+#include "kernel/yosys.h"
+#include "kernel/yosys_common.h"
+#include "kernel/celltypes.h"
+#include "kernel/newcelltypes.h"
+
+#include <unordered_set>
+
+YOSYS_NAMESPACE_BEGIN
+
+TEST(CellTypesTest, basic)
+{
+	yosys_setup();
+	log_files.push_back(stdout);
+	CellTypes older;
+	NewCellTypes newer;
+	log("setup nullptr\n");
+	older.setup(nullptr);
+	newer.setup(nullptr);
+	log("setup type bleh\n");
+	older.setup_type(ID(bleh), {ID::G}, {ID::H, ID::I}, false, true);
+	newer.setup_type(ID(bleh), {ID::G}, {ID::H, ID::I}, false, true);
+
+	EXPECT_EQ(older.cell_known(ID(aaaaa)), newer.cell_known(ID(aaaaa)));
+	EXPECT_EQ(older.cell_known(ID($and)), newer.cell_known(ID($and)));
+	for (size_t i = 0; i < 1000; i++) {
+		IdString type;
+		type.index_ = i;
+		if (older.cell_known(type) != newer.cell_known(type))
+			std::cout << i << " " << type.str() << "\n";
+		EXPECT_EQ(older.cell_known(type), newer.cell_known(type));
+
+	}
+	yosys_shutdown();
+}
+
+YOSYS_NAMESPACE_END