Just a guess, but if your test case really is abstract, then JUnit would not
be able to instantiate it.
In the current Collections tests, we use the "abstract" keyword either for
base classes that test a particular interface (e.g. TestMap) or classes that
exercise JVM collections, where we don't want to test the class itself, but
we do want to test our own custom subclasses (e.g. TestHashMap).
- Morgan
----- Original Message -----
From: "Kief Morris" <[EMAIL PROTECTED]>
To: "Jakarta Commons Developers List" <[EMAIL PROTECTED]>
Sent: Friday, March 08, 2002 2:36 PM
Subject: [COLLECTIONS] Submission: Tree & StandardTree
> Morgan Delagrange typed the following on 01:35 PM 3/7/2002 -0600
> >Please, accompany any new collections with appropriate unit tests. Try
to
> >integrate those unit tests with our micro-framework for testing, but if
you
> >have trouble I'll do it for you. Any new Collection that does not
include
> >tests will probably not be included in the 2.0 release.
>
> Hi Morgan, I've got a collection I'd like to contribute, perhaps it could
go
> into 2.1 (I'm assuming it's too late in the cycle for 2.0). Code is
attached,
> but I'm having trouble adding my tests to the existing unit tests.
>
> TREE COLLECTION
>
> The Tree collection maintains objects in a basic tree structure, similar
to
> typical file system directory structures. It works very much like a Map,
with
> a Tree interface extending the Map interface, except that objects inserted
> into the Tree require a parent key in addition to the normal key. The
interface
> allows subsets of the Tree's contents to be easily accessed, in particular
> to get the children of a particular node in the tree. The StandardTree is
an
> unsynchronized implementation of the Tree interface. The TreeEntry class
> subclasses Map.Entry - it's separate from the StandardTree class to make
> it easy to use and subclass for other Tree implementations.
>
> I welcome any feedback on this code. I'm not 100% sure whether the way
> I'm handling the root node is best: it's a semi-internal entry, created
along
> with the tree and not reflected in the size() and most other methods,
although
> the key and value can be explicitly set and returned.
>
>
> Unit test issues:
>
> I have some unit tests of my own, although they're not very thorough ones,
> which I want to move the tests to the commons-collections test suite. I
> tried to make a very basic test based on the existing test classes, but
haven't
> gotten it working. I extended TestMap, since my collection implements the
> Map interface, trying to get a minimal test going before adding my own
tests
> in. I expect this minimal implementation to fail since my implementation
doesn't
> implement some of the Map methods (although it does throw the appropriate
> errors), but want to get the core working before tailoring it for
StandardTree.
>
> I'm getting many errors, which I don't understand:
>
> [java] There were 34 failures:
> [java] 1)
warning(junit.framework.TestSuite$1)junit.framework.AssertionFailedError: C
> annot instantiate test case: testSampleMappings
(java.lang.InstantiationException: org.apa
> che.commons.collections.TestStandardTree
> [java] at java.lang.reflect.Constructor.newInstance(Native
Method)
> [java] at
org.apache.commons.collections.TestStandardTree.suite(Unknown Source)
> [java] at org.apache.commons.collections.TestAll.suite(Unknown
Source)
> [java] at
junit.runner.BaseTestRunner.getTest(BaseTestRunner.java:53)
> [java] )
> [java] 2)
warning(junit.framework.TestSuite$1)junit.framework.AssertionFailedError: C
> annot instantiate test case: testMakeMap
(java.lang.InstantiationException: org.apache.com
> mons.collections.TestStandardTree
> [java] at java.lang.reflect.Constructor.newInstance(Native
Method)
> [java] at
org.apache.commons.collections.TestStandardTree.suite(Unknown Source)
> [java] at org.apache.commons.collections.TestAll.suite(Unknown
Source)
> [java] at
junit.runner.BaseTestRunner.getTest(BaseTestRunner.java:53)
>
>
> And so on. My test looks like:
>
> public abstract class TestStandardTree extends TestMap
> {
> public TestStandardTree(String testName) {
> super(testName);
> }
>
> public static Test suite() {
> return new TestSuite(TestStandardTree.class);
> }
>
> public static void main(String args[]) {
> String[] testCaseName = { TestStandardTree.class.getName() };
> junit.textui.TestRunner.main(testCaseName);
> }
>
> public Map makeEmptyMap() {
> return new StandardTree();
> }
> }
>
> If you can help me get a basic test class going for this, I can flesh it
out.
>
> Thanks,
> Kief
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