Handle Assertion Error In Junit
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Junit Fail On Exception
catch block for java exception? up vote 7 down vote favorite Code:- try { Assert.assertEquals("1", "2"); } catch (Exception e) { System.out.println("I am in error block"); } If the assert statements fails, I would like to capture the error in the catch block. I am trying with the above code and its not happening. Will the assertion error be caught by in a catch block for java exception? how to handle assertion error in selenium java junit try-catch assert share|improve this question edited Apr 16 '15 at 10:32 J Richard Snape 14.6k42352 asked Apr 16 '15 at 10:19 karan 856724 Why would you want to do that anyways? This seems like a gross misuse of Assert which is meant for Unit Testing –Dragondraikk Apr 16 '15 at 10:25 add a comment| 3 Answers 3 active oldest votes up vote 16 down vote accepted You have almost answered your own question. Your catch block will not catch the AssertionError that the Assert throws if it fails, because it is an Error (or, more specifically, it extends java.lang.Error). See the docs for more information on this. Your catch block only catches Throwable objects that extend java.lang.Exception If you really want to catch it - you need to use catch (AssertionError e) { ... However, as others have mentioned, this is a very unusual way to use assertions - they should usually pass and if they fail it is very unusual for you to want to carry on program execution. That's why the failure throws an Error rather than an Exception. You can read more about (not) catching Error in this question. Are you sure you do
idiom With JUnit rule With @Test annotation With catch-exception library With custom annotation junit exceptions With Lambda expression (as of Java 1.8) With AssertJ 3.0.0
Java Catch Assertion Failure
for Java 8 Which one should we use and when? try-catch idiom This idiom is one
Junit Assert No Exception
of the most popular one, because it was used already in JUnit 3. @Test public void throwsExceptionWhenNegativeNumbersAreGiven() { try { calculator.add("-1,-2,3"); fail("Should throw an exception if one http://stackoverflow.com/questions/29671796/will-an-assertion-error-be-caught-by-in-a-catch-block-for-java-exception or more of given numbers are negative"); } catch (Exception e) { assertThat(e) .isInstanceOf(IllegalArgumentException.class) .hasMessage("negatives not allowed: [-1, -2]"); } } The above approach is a common pattern. The test will fail when no exception is thrown and the exception itself is verified in a catch clause (in the above example I used http://blog.codeleak.pl/2013/07/3-ways-of-handling-exceptions-in-junit.html the FEST Fluent Assertions) and although it is perfectly fine I prefer the approach with ExpectedException rule. With JUnit rule The same example can be created using ExceptedException rule. The rule must be a public field marked with @Rule annotation. Please note that the "thrown" rule may be reused in many tests. @Rule public ExpectedException thrown = ExpectedException.none(); @Test public void throwsExceptionWhenNegativeNumbersAreGiven() { // arrange thrown.expect(IllegalArgumentException.class); thrown.expectMessage(equalTo("negatives not allowed: [-1, -2]")); // act calculator.add("-1,-2,3"); } In general, I find the above code more readable hence I use this approach in my projects. When the exception isn't thrown you will get the following message: java.lang.AssertionError: Expected test to throw (an instance of java.lang.IllegalArgumentException and exception with message "negatives not allowed: [-1, -2]"). Pretty nice. But not all exceptions I check with the above approach. Sometimes I need to check only the type of the exception thrown and then I use @Test annotation. With annotation @Test (expected =
SOAEJB3SpringPDFEmailJ2MEJ2EE ApplicationXMLDesign PatternLogSecurityApache CommonAntJUnitCatch assert exception with message http://www.java2s.com/Tutorial/Java/0120__Development/Catchassertexceptionwithmessage.htm : Assertions«Development«Java TutorialJava TutorialDevelopmentAssertionspublic class Main { public static void main(String[] argv) throws Exception { try { assert argv.length assertion error > 0 : "my message"; } catch (AssertionError e) { String message = e.getMessage(); System.out.println(message); } } } handle assertion error 6.24.Assertions6.24.1.Assertions6.24.2.More Complex Assertions6.24.3.Assert with an informative message6.24.4.Compile 'assert'6.24.5.A Program with Assertions6.24.6.Enabling Assertions from the Command Line: -ea and -da enable and disable assertion in a package subtree or in a class.6.24.7.Handling an Assertion Error6.24.8.Catch assert exception with message6.24.9.Using the class loader to enable assertionsjava2s.com |Email:info at java2s.com|© Demo Source and Support. All rights reserved.