ScalaTest 1.0
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trait
AssertionsForJUnit
extends
Assertions
The assertion methods provided in this trait look and behave exactly like the ones in
Assertions
, 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.AssertionFailedError
s 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
AssertionsForJUnit
trait instead of plain-old ScalaTest
Assertions
.
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.AssertionsForJUnit class MyTestCase extends TestCase with AssertionsForJUnit { def testSomething() { assert("hi".charAt(1) === 'i') } // ... }
You can alternatively import the methods defined in this trait.
import junit.framework.TestCase import org.scalatest.junit.AssertionsForJUnit._ class MyTestCase extends TestCase { def testSomething() { assert("hi".charAt(1) === 'i') } // ... }
For details on the importing approach, see the documentation
for the AssertionsForJUnit
companion object.
For the details on the AssertionsForJUnit
syntax, see the Scaladoc documentation for
org.scalatest.Assertions
Methods inherited from Assertions | |
assert, assert, assert, assert, convertToEqualizer, intercept, expect, expect, fail, fail, fail, fail |
Methods inherited from AnyRef | |
getClass, hashCode, equals, clone, toString, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized |
Methods inherited from Any | |
==, !=, isInstanceOf, asInstanceOf |
ScalaTest 1.0
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