spock - Spock 特征方法中先决条件的好风格是什么？

Question

在特征方法中，在 when: 中指定特征 Action 。块，其结果在后续 then: 中得到测试堵塞。通常需要准备，这在 given: 中完成条款(或 setup: 或夹具方法)。包含前提条件同样有用:这些条件不是特性测试的主题(因此不应该在 when: - then: 或 expect: 中)但它们断言/记录测试的必要条件有意义。例如，请参见下面的虚拟规范:

import spock.lang.*

class DummySpec extends Specification {
  def "The leading three-caracter substring can be extracted from a string"() {
    given: "A string which is at least three characters long"
    def testString = "Hello, World"

    assert testString.size() > 2

    when: "Applying the appropriate [0..2] operation"
    def result = testString[0..2]

    then: "The result is three characters long"
    result.size() == 3
  }
}

对于这些先决条件，建议的做法是什么？我用过 assert在示例中，但很多人不赞成 assert s 在规范中。

Answer 1

我一直在用expect对于此类场景:

@Grab('org.spockframework:spock-core:0.7-groovy-2.0')
@Grab('cglib:cglib-nodep:3.1')

import spock.lang.*

class DummySpec extends Specification {
  def "The leading three-caracter substring can be extracted from a string"() {
    given: "A string which is at least three characters long"
    def testString = "Hello, World"

    expect: "Input should have at least 3 characters"
    testString.size() > 3

    when: "Applying the appropriate [0..2] operation"
    def result = testString[0..2]

    then: "The result is three characters long"
    result.size() == 3
  }
}