--- /dev/null
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#include "opentelemetry/nostd/function_ref.h"
+
+#include <gtest/gtest.h>
+using namespace opentelemetry::nostd;
+
+int Call(function_ref<int()> f)
+{
+ return f();
+}
+
+int Return3()
+{
+ return 3;
+}
+
+TEST(FunctionRefTest, Call)
+{
+ int x = 9;
+
+ auto f = [&] { return x; };
+ EXPECT_EQ(Call(f), 9);
+
+ EXPECT_EQ(Call(Return3), 3);
+}
+
+TEST(FunctionRefTest, BoolConversion)
+{
+ auto f = [] { return 0; };
+ function_ref<int()> fref1{nullptr};
+ function_ref<int()> fref2{f};
+ EXPECT_TRUE(!static_cast<bool>(fref1));
+ EXPECT_TRUE(static_cast<bool>(fref2));
+}