1 files changed, 50 insertions, 0 deletions
diff --git a/na/test/test_fdt.cc b/na/test/test_fdt.cc
new file mode 100644
index 0000000..cf09029
--- /dev/null
+++ b/na/test/test_fdt.cc
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2026 Richard Qin */
+
+/*
+ * Boot Self-Test: FDT (Flattened Device Tree)
+ */
+
+#include <lume/selftest.h>
+#include <lume/fdt.h>
+
+// Manually declare what we need to avoid header conflicts with toolchain libc
+extern "C" int strcmp(const char *s1, const char *s2);
+
+void selftest_fdt() {
+    st_begin("fdt: tree root access");
+    {
+        DeviceNode* root = fdt_get_node_by_path("/");
+        ST_ASSERT(root != nullptr);
+        ST_ASSERT_EQ(strcmp(root->get_name(), ""), 0); 
+    }
+    st_pass();
+
+    st_begin("fdt: find existing compatible node (UART)");
+    {
+        // QEMU virt RISC-V platform always has a ns16550a UART
+        DeviceNode* uart = fdt_find_compatible("ns16550a");
+        ST_ASSERT(uart != nullptr);
+        
+        // Use get_prop_string which is convenience helper
+        const char* compat = uart->get_prop_string("compatible");
+        ST_ASSERT(compat != nullptr);
+        
+        // Check raw property access
+        const FdtProperty* reg = uart->get_prop("reg");
+        ST_ASSERT(reg != nullptr);
+        ST_ASSERT(reg->value != nullptr);
+        ST_ASSERT(reg->len > 0);
+    }
+    st_pass();
+
+    st_begin("fdt: non-existent node/compatible queries");
+    {
+        DeviceNode* missing1 = fdt_get_node_by_path("/definitely_does_not_exist_node_12345");
+        ST_ASSERT(missing1 == nullptr);
+
+        DeviceNode* missing2 = fdt_find_compatible("invalid_compatible_string_xyz");
+        ST_ASSERT(missing2 == nullptr);
+    }
+    st_pass();
+}