问题描述
我想在Scala中测试私有方法，发现Scalatest的PrivateMethodTester可以满足我的需求.但是似乎存在导入问题.
I wanted to test a private method in Scala, and found that Scalatest's PrivateMethodTester does what I need. But there seems to be an import problem.
import org.scalatest._
//Alternatively, I tried
//import org.scalatest.PrivateMethodTester
//import org.scalatest.FlatSpec
"calculateCutoffCriteria" should "give mu -2sigma, mu - sigma, mu + sigma, mu+2sigma as bounds" in {
val testData = List(-1, -1, 0, 1, 1)
val expected = (-2, -1, 1, 2)
val thePrivateMethod = PrivateMethodTester.PrivateMethod[Study]('calculateCutoffCriteria)
val actual = Study invokePrivate thePrivateMethod(testData)
assert(actual === expected)
}
由于某些原因，我不能只调用PrivateMethod[Study]，我必须指定PrivateMethodTester.PrivateMethod[Study].而且invokePrivate根本不起作用，整个测试不会编译为invokePrivate不是对象Study成员的错误.
For some reason, I cannot just call PrivateMethod[Study], I have to specify PrivateMethodTester.PrivateMethod[Study]. And invokePrivate doesn't work at all, the whole test doesn't compile with the error that invokePrivate is not a member of the object Study.
我的项目引用了scalatest_2.10.-2.1.0.jar，所有其他测试(不使用PrivateMethodTester)的运行均与预期相同.这是什么问题?
My project references scalatest_2.10.-2.1.0.jar, and all the other tests (which don't use PrivateMethodTester) run just like they should. What's the problem here?
推荐答案
在忘记使用org.scalatest.PrivateMethodTester特性扩展测试类之前，我遇到了这个问题. PrivateMethodTester是为您提供invokePrivate方法的工具.试一试，看看是否有帮助.
I've had this problem before when I forgot to extend my test class with the org.scalatest.PrivateMethodTester trait. The PrivateMethodTester is what gives you your invokePrivate method. Give that a shot and see if that helps at all.
import org.scalatest.PrivateMethodTester
class TestSomething extends FlatSpec with PrivateMethodTester {
"calculateCutoffCriteria" should
"give mu -2sigma, mu - sigma, mu + sigma, mu+2sigma as bounds" in {
val testData = List(-1, -1, 0, 1, 1)
val expected = (-2, -1, 1, 2)
val thePrivateMethod = PrivateMethodTester.PrivateMethod[Study]('calculateCutoffCriteria)
val actual = Study invokePrivate thePrivateMethod(testData)
assert(actual === expected)
}
}
这篇关于Scalatest，无法调用invokePrivate的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！