使用nunit和TestCaseSource以及TestCaseData设置复杂的行测试

Question

对于每个期望返回值,如2或4,我想将此值作为单元测试方法的参数传递.但我得到一个例外,即参数不正确.当我删除countExpected参数单元测试运行正常我只是不能断言countExpected ...

这种情况在NUnit中是否可行？

[Test, TestCaseSource("VisibleWeekDays")]
public void Test(DayOfWeek[] visibleWeekDaysSetup, int countExpected)
{
    // ARRANGE

    // ACT

    // ASSERT
    Assert.That(periods.Count(),Is.EqualTo(countExpected));
}

private static IEnumerable<TestCaseData> VisibleWeekDays
{
    get
    {
        yield return new TestCaseData(new DayOfWeek[] {DayOfWeek.Sunday}).Returns(2);
        yield return new TestCaseData(new DayOfWeek[] {DayOfWeek.Sunday, DayOfWeek.Monday}).Returns(4);
        // more days...
    }
}

Answer 1

见这里的解释:

.Returns
从方法返回的预期结果,该方法必须具有兼容的返回类型.

因此,如果要使用TestCaseData.Returns(),则需要按以下方式编写测试:

[Test, TestCaseSource("VisibleWeekDays")]
public int Test(DayOfWeek[] visibleWeekDaysSetup)
{
     // ARRANGE

    // ACT

    // ASSERT
    return periods.Count();
}

更新:
如果要将期望值作为参数传递,则需要将其作为常规测试用例数据传递.见例子:

[Test, TestCaseSource("VisibleWeekDays")]
public void Test(DayOfWeek[] visibleWeekDaysSetup, int countExpected)
{
    ...

    Assert.That(periods.Count(),Is.EqualTo(countExpected));
}

private static IEnumerable<TestCaseData> VisibleWeekDays
{
    get
    {
        yield return new TestCaseData(new DayOfWeek[] {DayOfWeek.Sunday}, 2);
        yield return new TestCaseData(new DayOfWeek[] {DayOfWeek.Sunday, DayOfWeek.Monday}, 4);
        // more days...
    }
}