Can Moq Handle Out and Ref Parameters in Unit Tests?

Use Moq to simulate out and ref parameters

In some cases it is necessary to set out or ref parameters in unit tests. Moq is a popular simulation framework that allows you to simulate various scenarios, but the question remains: can it handle out and ref parameters specifically?

Out parameter

Yes, it is possible to assign out parameters using Moq. When you call the Setup method, Moq takes a snapshot of the value of the out parameter.

<code>public interface IService
{
    void DoSomething(out string a);
}

[TestMethod]
public void TestOutParam()
{
    var service = new Mock<IService>();
    string expectedValue = "value";
    service.Setup(s => s.DoSomething(out expectedValue));

    string actualValue;
    service.Object.DoSomething(out actualValue);
    Assert.AreEqual(expectedValue, actualValue);
}</code>

Ref parameter

Currently, Moq does not support setting the ref parameter, but the search for a solution continues.

More resources

If you want to learn more, the Moq Quick Start Guide provides a comprehensive overview of the framework’s features:

https://www.php.cn/link/a77054e9d6c3fb75907aed15140ca1e6

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