将lambda传递给参数化的NUnit测试

Question

我有一个带有一堆重载运算符的类:

public static double[,] operator +(Matrix matrix, double[,] array)
public static double[,] operator -(Matrix matrix, double[,] array)
public static double[,] operator *(Matrix matrix, double[,] array)

对于所有这些我想测试操作数为null.我有一个NUnit测试:

public void MatrixOperatorOperandIsNullThrows(Func<Matrix, double[,], double[,]> op)
{
    Matrix m = null;
    var right = new double[,] {{1, 1}, {1, 1}};
    Assert.Throws<ArgumentException>(() => op(m, right));
}

我怎样才能为每个运营商传递一个lambda (l,r) => l + r？

Answer 1

您不能立即应用包含lambda表达式的TestCase属性,即以下测试将无效:

[TestCase((a, b) => a + b)]
public void WillNotCompileTest(Func<double, double, double> func)
{
    Assert.GreaterOrEqual(func(1.0, 1.0), 1.0);
}

但是,你可以做的是将TestCaseSource属性与lambda表达式的IEnumerable一起使用,如下所示:

[TestFixture]
public class TestClass
{
    private IEnumerable<Func<double, double, double>> TestCases
    {
        get
        {
            yield return (a, b) => a + b;
            yield return (a, b) => a * b;
            yield return (a, b) => a / b;
        }
    }

    [TestCaseSource("TestCases")]
    public void Test(Func<double, double, double> func)
    {
        Assert.GreaterOrEqual(func(1.0, 1.0), 1.0);
    }
}

Answer 2

你完全可以通过：

MatrixOperatorOperandIsNullThrows((l,r) => l + r);