c# - 使用 Mock 对 void 方法进行单元测试？

Question

我想用 Mock 测试一个 void 方法。

 public class ConsoleTargetBuilder : ITargetBuilder
{
    private const string CONSOLE_WITH_STACK_TRACE = "consoleWithStackTrace";
    private const string CONSOLE_WITHOUT_STACK_TRACE = "consoleWithoutStackTrace";
    private LoggerModel _loggerModel;
    private LoggingConfiguration _nLogLoggingConfiguration;

    public ConsoleTargetBuilder(LoggerModel loggerModel, LoggingConfiguration nLogLoggingConfiguration)
    {
        _loggerModel = loggerModel;
        _nLogLoggingConfiguration = nLogLoggingConfiguration;
    }

    public void AddNLogConfigurationTypeTagret()
    {
        var consoleTargetWithStackTrace = new ConsoleTarget();
        consoleTargetWithStackTrace.Name = CONSOLE_WITH_STACK_TRACE;
        consoleTargetWithStackTrace.Layout = _loggerModel.layout + "|${stacktrace}";
        _nLogLoggingConfiguration.AddTarget(CONSOLE_WITH_STACK_TRACE, consoleTargetWithStackTrace);

        var consoleTargetWithoutStackTrace = new ConsoleTarget();
        consoleTargetWithoutStackTrace.Name = CONSOLE_WITHOUT_STACK_TRACE;
        consoleTargetWithoutStackTrace.Layout = _loggerModel.layout;
        _nLogLoggingConfiguration.AddTarget(CONSOLE_WITHOUT_STACK_TRACE, consoleTargetWithoutStackTrace);
    }

问题是我不确定如何测试它。我有我的主要代码。

public class ConsoleTargetBuilderUnitTests
{
    public static IEnumerable<object[]> ConsoleTargetBuilderTestData
    {
        get
        {
            return new[]
            {
                 new object[]
                {
                    new LoggerModel(),
                    new LoggingConfiguration(),
                    2
                }
            };
        }
    }
    [Theory]
    [MemberData("ConsoleTargetBuilderTestData")]
    public void ConsoleTargetBuilder_Should_Add_A_Console_Target(LoggerModel loggerModel, LoggingConfiguration nLogLoggingConfiguration, int expectedConsoleTargetCount)
    {
        // ARRANGE
        var targetBuilderMock = new Mock<ITargetBuilder>();
        targetBuilderMock.Setup(x => x.AddNLogConfigurationTypeTagret()).Verifiable();
        // ACT
        var consoleTargetBuilder = new ConsoleTargetBuilder(loggerModel, nLogLoggingConfiguration);
        // ASSERT
        Assert.Equal(expectedConsoleTargetCount, nLogLoggingConfiguration.AllTargets.Count);
    }

请指引我正确的方向。

Answer 1

在我看来，您根本不需要模拟。您正在测试 AddNLogConfigurationTypeTagret。不是构造函数。

[Theory]
[MemberData("ConsoleTargetBuilderTestData")]
public void ConsoleTargetBuilder_Should_Add_A_Console_Target(LoggerModel loggerModel, LoggingConfiguration nLogLoggingConfiguration, int expectedConsoleTargetCount)
{
    // ARRANGE
    var consoleTargetBuilder = new ConsoleTargetBuilder(loggerModel, nLogLoggingConfiguration);
    // ACT
    consoleTargetBuilder.AddNLogConfigurationTypeTagret();
    // ASSERT
    Assert.Equal(expectedConsoleTargetCount, nLogLoggingConfiguration.AllTargets.Count);
}

如果不想自己调用AddNLogConfigurationTypeTagret，应该在构造函数中调用。这会将测试更改为:

[Theory]
[MemberData("ConsoleTargetBuilderTestData")]
public void ConsoleTargetBuilder_Should_Add_A_Console_Target(LoggerModel loggerModel, LoggingConfiguration nLogLoggingConfiguration, int expectedConsoleTargetCount)
{
    // ARRANGE
    // ACT
    var consoleTargetBuilder = new ConsoleTargetBuilder(loggerModel, nLogLoggingConfiguration);
    // ASSERT
    Assert.Equal(expectedConsoleTargetCount, nLogLoggingConfiguration.AllTargets.Count);
}

然后类构造函数应该是:

public ConsoleTargetBuilder(LoggerModel loggerModel, LoggingConfiguration nLogLoggingConfiguration)
{
    _loggerModel = loggerModel;
    _nLogLoggingConfiguration = nLogLoggingConfiguration;
    AddNLogConfigurationTypeTagret();
}