Moq Mock 时总是报错 "Unsupported expression"

下面的 C# mock 代码，编译通过，但运行时总是报错

var redisDatabaseMock = new Mock<IRedisDatabase>();
redisDatabaseMock
    .Setup(x => x.GetOrCreateAsync(
        It.IsAny<string>(),
        It.IsAny<TimeSpan>(),
        It.IsAny<Func<Task<UserDto>>>()))
    .Returns(async (Func<Task<UserDto>> func) => await func());
var redisClientMock = new Mock<IRedisClient>();
redisClientMock
    .Setup(x => x.GetDefaultDatabase())
    .Returns(redisDatabaseMock.Object);
var redisClientFactoryMock = new Mock<IRedisClientFactory>();
redisClientFactoryMock
    .Setup(x => x.GetRedisClient(It.IsAny<string>()))
    .Returns(redisClientMock.Object);
var result = await redisClientFactoryMock.Object
    .GetRedisClient("default")
    .GetDefaultDatabase()
    .GetOrCreateAsync("test", TimeSpan.FromSeconds(10), () => Task.FromResult(new UserDto("Cnblogs")));
Console.WriteLine(result);
public record UserDto(string Name);

错误信息如下

Unhandled exception. System.NotSupportedException: Unsupported expression: x => x.GetOrCreateAsync<UserDto>(It.IsAny<string>(), It.IsAny<TimeSpan>(), It.IsAny<Func<Task<UserDto>>>(), When.Always, CommandFlags.None)

回答

GetOrCreateAsync 是扩展方法，Moq 不支持 mock 扩展方法