org.scalatest.junit.MustMatchersForJUnit.scala Maven / Gradle / Ivy
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/*
* Copyright 2001-2008 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.junit
import org.scalatest._
import _root_.junit.framework.AssertionFailedError
import org.scalatest.matchers.MustMatchers
/**
* Trait that makes ScalaTest's MustMatchers DSL syntax available for use with JUnit.
*
*
* The assertion methods provided in this trait look and behave exactly like the ones in
* MustMatchers, except instead of throwing
* TestFailedException they throw
* JUnitTestFailedError,
* which extends junit.framework.AssertionFailedError.
*
*
* JUnit 3 (release 3.8 and earlier) distinguishes between failures and errors.
* If a test fails because of a failed assertion, that is considered a failure. If a test
* fails for any other reason, either the test code or the application being tested threw an unexpected
* exception, that is considered an error. The way JUnit 3 decides whether an exception represents
* a failure or error is that only thrown junit.framework.AssertionFailedErrors are considered
* failures. Any other exception type is considered an error. The exception type thrown by the JUnit 3
* assertion methods declared in junit.framework.Assert (such as assertEquals,
* assertTrue, and fail) is, therefore, AssertionFailedError.
*
*
*
* In JUnit 4, AssertionFailedError was made to extend java.lang.AssertionError,
* and the distinction between failures and errors was essentially dropped. However, some tools that integrate
* with JUnit carry on this distinction, so even if you are using JUnit 4 you may want to use this
* MustMatchersForJUnit trait instead of plain-old ScalaTest
* MustMatchers.
*
*
*
* To use this trait in a JUnit 3 TestCase, you can mix it into your TestCase class, like this:
*
*
*
* import junit.framework.TestCase
* import org.scalatest.junit.MustMatchersForJUnit
*
* class MyTestCase extends TestCase with MustMatchersForJUnit {
*
* def testSomething() {
* "hello, world!" must startWith ("hello")
* }
*
* // ...
* }
*
*
*
* You can alternatively import the methods defined in this trait.
*
*
*
* import junit.framework.TestCase
* import org.scalatest.junit.MustMatchersForJUnit._
*
* class MyTestCase extends TestCase {
*
* def testSomething() {
* "hello, world!" must startWith ("hello")
* }
*
* // ...
* }
*
*
*
* For details on the importing approach, see the documentation
* for the MustMatchersForJUnit companion object.
* For the details on the MustMatchersForJUnit syntax, see the Scaladoc documentation for
* org.scalatest.matchers.MustMatchers
*
*
* @author Bill Venners
*/
trait MustMatchersForJUnit extends MustMatchers with AssertionsForJUnit {
//private[scalatest] override def newTestFailedException(message: String): Throwable = new AssertionFailedError(message)
private[scalatest] override def newTestFailedException(message: String, optionalCause: Option[Throwable] = None, stackDepthAdjustment: Int): Throwable = {
val fileNames = List("Matchers.scala", "MustMatchers.scala", "MustMatchers.scala", "MustMatchersForJUnit.scala", "MustMatchersForJUnit.scala")
val temp = new RuntimeException
val stackDepth = temp.getStackTrace.takeWhile(stackTraceElement => fileNames.exists(_ == stackTraceElement.getFileName) || stackTraceElement.getMethodName == "newTestFailedException").length
optionalCause match {
case Some(cause) => new JUnitTestFailedError(message, cause, stackDepth + stackDepthAdjustment)
case None => new JUnitTestFailedError(message, stackDepth + stackDepthAdjustment)
}
}
}
/**
* Companion object that facilitates the importing of MustMatchersForJUnit members as
* an alternative to mixing it in. One use case is to import MustMatchersForJUnit members so you can use
* them in the Scala interpreter:
*
*
* Macintosh-65:delus bv$ scala -cp .:../target/jar_contents:junit3.8.2/junit.jar
* Welcome to Scala version 2.7.5.final (Java HotSpot(TM) Client VM, Java 1.5.0_16).
* Type in expressions to have them evaluated.
* Type :help for more information.
*
* scala> import org.scalatest.junit.MustMatchersForJUnit._
* import org.scalatest.junit.MustMatchersForJUnit._
*
* scala> "hi" must have length (3)
* junit.framework.AssertionFailedError: "hi" did not have length 3
* at org.scalatest.junit.MustMatchersForJUnit$class.newTestFailedException(MustMatchersForJUnit.scala:22)
* at org.scalatest.junit.MustMatchersForJUnit$.newTestFailedException(MustMatchersForJUnit.scala:63)
* at org.scalatest.matchers.Matchers$ResultOfHaveWordForString.length(Matchers.scala:4102)
* at .( 1 must equal (2)
* junit.framework.AssertionFailedError: 1 did not equal 2
* at org.scalatest.junit.MustMatchersForJUnit$class.newTestFailedException(MustMatchersForJUnit.scala:22)
* at org.scalatest.junit.MustMatchersForJUnit$.newTestFailedException(MustMatchersForJUnit.scala:63)
* at org.scalatest.matchers.MustMatchers$MustMethodHelper$.mustMatcher(MustMatchers.scala:800)
* at org.scal...
* scala> "hello, world" must startWith ("hello")
*
* scala> 7 must (be >= (3) and not be <= (7))
* junit.framework.AssertionFailedError: 7 was greater than or equal to 3, but 7 was less than or equal to 7
* at org.scalatest.junit.MustMatchersForJUnit$class.newTestFailedException(MustMatchersForJUnit.scala:22)
* at org.scalatest.junit.MustMatchersForJUnit$.newTestFailedException(MustMatchersForJUnit.scala:63)
* at org.scalatest.matchers.MustMatchers$MustMethodHelper$.sh...
*
*
* @author Bill Venners
*/
object MustMatchersForJUnit extends MustMatchersForJUnit