Solving ScalaTest#427 by upgrading ScalaTest to 3.0.0-RC4

build.properties

sbt.version = 0.13.12

build.sbt

scalaVersion := "2.11.8"

// libraryDependencies += "org.scalatest" %% "scalatest" % "2.2.5" % "test"
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0-RC4" % "test"
libraryDependencies += "org.scalacheck" %% "scalacheck" % "1.13.2" % "test"

fork in Test := true

SomeSpec.scala

import org.scalatest.prop.GeneratorDrivenPropertyChecks
import org.scalatest.{ Matchers, WordSpec }

class SomeSpec extends WordSpec with Matchers with GeneratorDrivenPropertyChecks {
  "this test should fail without sbt exceptions" in {
    forAll { value: Int =>
      assert(value !== value)
      // value shouldNot equal(value)
    }
  }

  "this test should pass without any exceptions in the console" in {
    forAll { value: Int =>
      value shouldEqual value
    }
  }
}