Scalatest’DoubleTolerance’中的一个错误？

发布时间：2020-12-16 09:49:00 所属栏目：安全来源：网络整理

导读：我遇到了失败的测试,在我的所有理解中都应该通过.我错过了一些明显的东西吗？ import org.scalatest._class xxxTests extends FlatSpec with ShouldMatchers { import math.{Pi = PI} "" should "(this should pass)" in { assert( 0.0 === 0.0 ) // ok (1e-

我遇到了失败的测试,在我的所有理解中都应该通过.我错过了一些明显的东西吗？

import org.scalatest._

class xxxTests extends FlatSpec with ShouldMatchers {
  import math.{Pi => PI}

  "" should "(this should pass)" in {
    assert( 0.0 === 0.0 )  // ok

    (1e-100) should equal ((0.0) plusOrMinus 1e-5)    // FAILS!!!  "1.0E-100 did not equal DoubleTolerance(0.0,1.0E-5)"
    (1e-3) should not equal ((0.0) plusOrMinus 1e-5)    // ok
    (0.0) should equal ((0.0) plusOrMinus 1e-5)    // FAILS!!!  "0.0 did not equal DoubleTolerance(0.0,1.0E-5)"
  }
}

我在Scalatest 1.8和2.0M4上都经历过这种情况.

解决方法

问题：必须使用,不等于.

离开这里是我愚蠢的表现(恍惚,缺乏专注).

https://groups.google.com/forum/?fromgroups=#!msg/scalatest-users/pb54GzOej6I/C9714h_OW_UJ

You must use plusOrMinus with “be” not “equal”. “equal” always
compares for equality by invoking == on one object,passing in the
other. “be” does different things depending on what object is being
passed. So try:

0.5 must be (0.5 plusOrMinus 0.1)

（编辑：李大同）

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