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[Junit-trackers] [ junit-Feature Requests-1447312 ] Add @Prerequisite annotation for a test case
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From: SourceForge.net <no...@so...> - 2008-05-04 18:34:50
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Feature Requests item #1447312, was opened at 2006-03-10 07:56 Message generated for change (Comment added) made by nobody You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=365278&aid=1447312&group_id=15278 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Closed Resolution: None Priority: 5 Private: No Submitted By: Jochen Hiller (jhiller) Assigned to: David Saff (dsaff) Summary: Add @Prerequisite annotation for a test case Initial Comment: Test cases can be dependent on prerequisites, e.g. be online in Internet, have a database available, have database filled with specific test data, etc. In these cases it can be very annoying to @Ignore the test cases, because it may be different for each run or day. For this requirement, the @Prerequisite annotation can be used. Each test case marked with @Prerequisite will be checked, whether the condition is fulfilled. If not, the test case will be marked as ignored. For example: @Prerequisite (requires="isDBAvailable") @Test public void doDBTest() { ... } The method isDBAvailable must be implemented with following signature: - must be callable from TestRunner, so must be public. - must be callable either from tested object, or from a static helper class. - must return a boolean value. For example: public boolean isDBAvailable() { boolean available = ...; return available; } This method can also be provided by a static helper class, when specifiying a callee attribute to annotation. For example: @Prerequisite (requires="isDBAvailable", _callee=DBHelper.class) @Test public void doDBTest() { ... } public class DBHelper { public static boolean isDBAvailable() { boolean available = ...; return available; } } There are two open design questions: 1) @Prerequisite can also be made an extension to @Ignore eg. @Ignore (values="Check for database available", requires="isDBAvailable") 2) Current implementation handles a not fulfilled prerequisite as specified with @Ignore. Means, you cannot later distinguish between @Ignore and @Prerequisite runs. I provide a patch with the complete implementation. This has been inspired by a home-brewed JUnit 3.8.1 extension, where prerequisited will be also handled as AssertFailures, but extendes TestRunners are capable to filter them out. If useful, I could also provide patches for JUnit 3. 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It was previously set to a Pending status, and the original submitter did not respond within 14 days (the time period specified by the administrator of this Tracker). ---------------------------------------------------------------------- Comment By: David Saff (dsaff) Date: 2006-09-30 11:25 Message: Logged In: YES user_id=325156 Moving the discussion makes sense to me. Would you like to open a thread? Also, could you log the two issues from your latest comment as new feature requests, so we can work on them separately? Thanks. ---------------------------------------------------------------------- Comment By: Jochen Hiller (jhiller) Date: 2006-09-30 03:15 Message: Logged In: YES user_id=89401 I realized now a different approach, using Filter and Sorter interfaces (hint from Kent Beck). It was possible to implement this @Prerequisite requirement based on own Annotations and a custom runner. For details see http://www.junitext.org, download latest version. I had some design issues during implementation: - Description does not allow access to metadata, e.g. check, whether an own annotation is attached to a test method. Hack: parse string based representation, but very ugly - when calling a filter or sorter, there is no access to the current test object. So, I would not be able to call an instance based method on a test object. To solve this issue, I implemented a custom runner, which has to be attached via @RunWith(AnnotationRunner.class), which checks for own annotations. Could be a template for a general AnnotationSupportingRunner, where own annotations could be registered for examples (the current version is hardcoded). I would be happy to share my thoughts. Should we move discussion to junit-dev mailing list ? ---------------------------------------------------------------------- Comment By: David Saff (dsaff) Date: 2006-09-29 06:40 Message: Logged In: YES user_id=325156 I'd like to check out the patch to see if the custom runner support could be enhanced to support this kind of extension--that way, we could play with several different implementations that evolve independently of JUnit. Then, if a standard implementation emerges, we could think about including it. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=365278&aid=1447312&group_id=15278 |