org.scalatest.SeveredStackTraces.scala Maven / Gradle / Ivy

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ScalaTest is a free, open-source testing toolkit for Scala and Java programmers.

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/*
 * Copyright 2001-2013 Artima, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.scalatest

/**
 * Trait that causes StackDepth exceptions thrown by a running test (such as TestFailedExceptions) to have
 * the exception's stack trace severed at the stack depth. Because the stack depth indicates the exact line of code that caused
 * the exception to be thrown, the severed stack trace will show that offending line of code on top. This can make the line
 * of test code that discovered a problem to be more easily found in IDEs and tools that don't make use of
 * ScalaTest's StackDepth exceptions directly.
 *
 * @author Bill Venners
 */
trait SeveredStackTraces extends SuiteMixin { this: Suite =>

  /**
   * Invokes super.withFixture(test) and transforms a thrown StackDepth exception by severing
   * its stack trace at the stack depth.
   */
  abstract override def withFixture(test: NoArgTest): Outcome = {
    super.withFixture(test) match {
      case Exceptional(e: StackDepth) => Exceptional(e.severedAtStackDepth)
      case o => o
    }
  }
}