--- /dev/null
+++ xnu/xnu-7195.60.75/tests/bounded_ptr_src/assign.nullptr.cpp
@@ -0,0 +1,55 @@
+//
+// Tests for
+//  bounded_ptr& operator=(std::nullptr_t);
+//
+
+#include <cstddef>
+#include <libkern/c++/bounded_ptr.h>
+#include <darwintest.h>
+#include <darwintest_utils.h>
+#include "test_utils.h"
+
+#define _assert(...) T_ASSERT_TRUE((__VA_ARGS__), # __VA_ARGS__)
+
+struct T { };
+
+template <typename T, typename TQual>
+static void
+tests()
+{
+	T obj{};
+
+	// Assign from nullptr
+	{
+		test_bounded_ptr<TQual> p(&obj, &obj, &obj + 1);
+		_assert(p != nullptr);
+		test_bounded_ptr<TQual>& ref = (p = nullptr);
+		_assert(&ref == &p);
+		_assert(p == nullptr);
+	}
+
+	// Assign from NULL
+	{
+		test_bounded_ptr<TQual> p(&obj, &obj, &obj + 1);
+		_assert(p != nullptr);
+		test_bounded_ptr<TQual>& ref = (p = NULL);
+		_assert(&ref == &p);
+		_assert(p == nullptr);
+	}
+
+	// Assign from 0
+	{
+		test_bounded_ptr<TQual> p(&obj, &obj, &obj + 1);
+		_assert(p != nullptr);
+		test_bounded_ptr<TQual>& ref = (p = 0);
+		_assert(&ref == &p);
+		_assert(p == nullptr);
+	}
+}
+
+T_DECL(assign_nullptr, "bounded_ptr.assign.nullptr") {
+	tests<T, T>();
+	tests<T, T const>();
+	tests<T, T volatile>();
+	tests<T, T const volatile>();
+}