--- /dev/null
+++ xnu/xnu-12377.41.6/tests/intrusive_shared_ptr_src/operator.bool.cpp
@@ -0,0 +1,45 @@
+//
+// Tests for
+//      explicit constexpr operator bool() const noexcept;
+//
+
+#include <libkern/c++/intrusive_shared_ptr.h>
+#include <type_traits>
+#include <darwintest.h>
+#include "test_policy.h"
+
+struct T {
+	int i;
+};
+
+template <typename T>
+static void
+tests()
+{
+	T obj{3};
+
+	{
+		test_shared_ptr<T> const ptr(&obj, libkern::no_retain);
+		CHECK(static_cast<bool>(ptr));
+		if (ptr) {
+		} else {
+			CHECK(false);
+		}
+	}
+
+	{
+		test_shared_ptr<T> const ptr = nullptr;
+		CHECK(!static_cast<bool>(ptr));
+		if (!ptr) {
+		} else {
+			CHECK(false);
+		}
+	}
+
+	static_assert(!std::is_convertible_v<test_shared_ptr<T>, bool>);
+}
+
+T_DECL(operator_bool, "intrusive_shared_ptr.operator.bool", T_META_TAG_VM_PREFERRED) {
+	tests<T>();
+	tests<T const>();
+}