--- /dev/null
+++ xnu/xnu-10002.81.5/tests/safe_allocation_src/assign.nullptr.cpp
@@ -0,0 +1,46 @@
+//
+// Tests for
+//  safe_allocation& operator=(std::nullptr_t);
+//
+
+#include <libkern/c++/safe_allocation.h>
+#include <darwintest.h>
+#include "test_utils.h"
+
+struct T {
+	int i;
+};
+
+template <typename T>
+static void
+tests()
+{
+	// Assign to a non-null allocation
+	{
+		tracked_safe_allocation<T> array(10, libkern::allocate_memory);
+		tracking_allocator::reset();
+
+		tracked_safe_allocation<T>& ref = (array = nullptr);
+		CHECK(&ref == &array);
+		CHECK(array.data() == nullptr);
+		CHECK(array.size() == 0);
+		CHECK(tracking_allocator::did_deallocate);
+	}
+
+	// Assign to a null allocation
+	{
+		tracked_safe_allocation<T> array = nullptr;
+		tracking_allocator::reset();
+
+		tracked_safe_allocation<T>& ref = (array = nullptr);
+		CHECK(&ref == &array);
+		CHECK(array.data() == nullptr);
+		CHECK(array.size() == 0);
+		CHECK(!tracking_allocator::did_deallocate);
+	}
+}
+
+T_DECL(assign_nullptr, "safe_allocation.assign.nullptr") {
+	tests<T>();
+	tests<T const>();
+}