如何在SpecFlow中创建功能以满足多依赖要求

Question

我正在学习SpecFlow并且正在做一个简单的Com-Sci标准FizzBu​​zz项目.给定一系列数字替换可被3整除,Fizz替换可被5整除,Buzz替换可被3和5整除,使用FizzBu​​zz.

这是一个非常简单的应用程序,但它确实为我提出了一个问题.如何编写功能来测试多个requiremts,它们都是通过API上的一个方法调用触发的？例如FizzBuzz.Replace(1, 100); ,使用Replace方法代码,API调用如下所示

public static string Replace (int min, int max)
{
       if (IsDiv3 && IsDiv5) {...}
       if (IsDiv3) {...}
       if (IsDiv5) {...}
       ...
}

我在SpecFlow中的功能如下:

Feature: FizzBuzz
    In order to display Fizz Buzz in       range of numbers
    As a user I want to be able to see Fizz Buzz replace certain numbers

Scenario: Replace muliples of three and five with Fizz, Buzz or FizzBuzz
    Given I have a range of numbers from 1 to 15
    When I press Submit
    Then the result should be
    | Numbers   |
    |   1   |
    |   2   |
    |   Fizz    |
    |   4   |
    |   Buzz    |
    |   Fizz    |
    |   7   |
    |   8       |
    |   Fizz    |
    |   Buzz    |
    |   11      |
    |   Fizz    |
    |   13      |
    |   14  |
    |   FizzBuzz|

另一个问题是如果我确实需要在一个功能中聚集所有要求,如何使该功能更有意义.

编辑 我正在努力创建多个场景,因为只要我创建第二个场景,第一个场景就会失败.

scenario 1: replace divisable by 3 with Fizz
Expected = 1 2 Fizz 4 5 Fizz 7 8 Fizz 10 11 Fizz 13 14 Fizz
Actual =   1 2 Fizz 4 5 Fizz 7 8 Fizz 10 11 Fizz 13 14 Fizz (First test)
Actual =   1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 Fizz (Second test)

然后做下一个场景

Scenario 2: replace divisable by 5 with Buzz
Expected = 1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 Fizz
Actual =   1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 Fizz (Second test)

第二种情况通过但第一种情况现在失败了.我不认为打开API来做场景1,2,3对应用来说是一个很好的设计.

谢谢,

Answer 1

在邮件列表上看到你的消息.如果您想要拆分Fizz,Buzz和FizzBu​​zz的测试,您可以更改规范,为您的实现的每个分支创建一个场景(即每个"if"):

Scenario: Replace multiples of three with Fizz
    Given I have a range of numbers from 1 to 4
    When I press Submit
    Then the result should be
    | Numbers    |
    |   1        |
    |   2        |
    |   Fizz     |
    |   4        |

Scenario: Replace multiples of five with Buzz
    Given I have a range of numbers from 4 to 5
    When I press Submit
    Then the result should be
    | Numbers    |
    |   4        |
    |   Buzz     |

Scenario: Replace multiples of three and five with FizzBuzz
    Given I have a range of numbers from 14 to 16
    When I press Submit
    Then the result should be
    | Numbers    |
    |   14       |
    |   FizzBuzz |
    |   16       |

您的示例中的另一个观察是您的期望以表格(基本上是数组)表示,但您的结果以字符串表示.由于您在此示例中使用SpecFlow进行API测试,因此我会尝试通过更改规范或API来更紧密地对齐这两者.

例如,请考虑以下API更改"public static string [] Replace(int min,int max)".您的步骤将更容易编写 - 如下所示:

[Binding]
public class FizzBuzzSteps
{
    private int _min;
    private int _max;
    private string[] _results;

    [Given(@"I have a range of numbers from (\d+) to (\d+)")]
    public void GivenIHaveARangeOfNumbers(int min, int max)
    {
        _min = min;
        _max = max;
    }

    [When(@"I press Submit")]
    public void WhenIPressSubmit()
    {
        _results = FizzBuzz.Replace(_min, _max);
    }

    [Then(@"the result should be")]
    public void ThenTheResultShouldBe(Table table)
    {
        for (var i = 0; i < table.RowCount; i++)
        {
            var expected = table.Rows[i]["Numbers"];
            var actual = _results[i];
            Assert.AreEqual(expected, actual);
        }
    }
}

HTH,Dan Mork