Question

使用Scalatest 2.2.5，Scala 2.11.8，sbt 0.13.13，JDK 1.8.121

我们的代码库不断发展，开发人员对测试风格和匹配器有不同的偏好。在下面的代码中，测试使用Matchers，它还需要混合trait OurCommonTestHelpers，如果它在MustMatchers的声明中混合了with Matchers。这很容易解决，只需删除should equal并将must equal替换为should即可。让我假装我更喜欢动词import org.scalatest.{FreeSpec, Matchers} class MyBizLogicTest extends FreeSpec with Matchers // <-- conflict with MustMatchers from trait OurCommonTestHelpers with OurCommonTestHelpers { "A trivial addition" in { (1 + 2) should equal (3) } } trait OurCommonTestHelpers extends MockitoSugar with MustMatchers { ??? }，只是因为它在ScalaTest User Guide中使用

我们可能会标准化一天。但就目前而言，是否有可能在发生冲突时排除匹配器？

Error:(26, 7) class MyBizLogicTest inherits conflicting members:
  method convertSymbolToHavePropertyMatcherGenerator in trait Matchers of type (symbol: Symbol)MyBizLogicTest.this.HavePropertyMatcherGenerator  and
  method convertSymbolToHavePropertyMatcherGenerator in trait MustMatchers of type (symbol: Symbol)MyBizLogicTest.this.HavePropertyMatcherGenerator
(Note: this can be resolved by declaring an override in class MyBizLogicTest.);
 other members with override errors are: equal, key, value, a, an, theSameInstanceAs, regex, <, >, <=, >=, definedAt, evaluating, produce, oneOf, atLeastOneOf, noneOf, theSameElementsAs, theSameElementsInOrderAs, only, inOrderOnly, allOf, inOrder, atMostOneOf, thrownBy, message, all, atLeast, every, exactly, no, between, atMost, the, convertToRegexWrapper, of
class MyBizLogicTest extends FreeSpec

代码编译失败：

import org.scalatest.{MustMatchers => _}

注意：我试图通过{{1}}排除MustMatchers，但这对编译错误没有影响。

Answer 1

我认为你不能，因为这两个类都没有继承另一个。显而易见的方法是添加一个额外的类型：

// name just to be clear, I don't suggest actually using this one
trait OurCommonTestHelpersWithoutMatchers extends ... {
  // everything in OurCommonTestHelpers which doesn't depend on MustMatchers
}

trait OurCommonTestHelpers extends OurCommonTestHelpersWithoutMatchers with MustMatchers {
  ...
}

class MyBizLogicTest extends FreeSpec 
with Matchers 
with OurCommonTestHelpersWithoutMatchers 
{
  "A trivial addition" in {
      (1 + 2) should equal (3)
  }
}

注意：我试图通过导入org.scalatest排除MustMatchers。{MustMatchers =＆gt; _}但这对编译错误没有影响。

您无法通过导入删除继承的成员。如果您通过导入OurCommonTestHelpers来访问它们，则不会在MyBizLogicTest中导入它们（但需要在需要它们的其他类中导入）。

ScalaTest如果混合使用多个匹配器，如何排除MustMatchers

1 个答案: