如何使用Moq模拟扩展方法？

Install-Package Moq

public static class StringExtensions
{
    public static bool IsNullOrEmpty(this string value)
    {
        return string.IsNullOrEmpty(value);
    }
}

public interface IStringExtensions
{
    bool IsNullOrEmpty(string value);
}

public class MockStringExtensions
{
    private readonly Mock<IStringExtensions> _mock;

    public MockStringExtensions()
    {
        _mock = new Mock<IStringExtensions>();
    }

    public void SetupIsNullOrEmpty(string value, bool result)
    {
        _mock.Setup(x => x.IsNullOrEmpty(value)).Returns(result);
    }

    public bool IsNullOrEmpty(string value)
    {
        return _mock.Object.IsNullOrEmpty(value);
    }
}

var mock = new MockStringExtensions();

// 设置模拟的IsNullOrEmpty方法的返回值
mock.SetupIsNullOrEmpty("Test", false);

// 使用模拟的IsNullOrEmpty方法
bool result = mock.IsNullOrEmpty("Test");

Assert.IsFalse(result);