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Product Version: NetBeans IDE Dev (Build 200907300201) Java: 1.6.0_15; Java HotSpot(TM) Client VM 14.1-b02 System: Windows XP version 5.1 running on x86; Cp1250; cs_CZ (nb) If you create a test for java Interface (e.g. MyInterface) with some method (public void foo()), the file "MyInterfaceTest" contains: public class MyInterfaceImpl extends MyInterface { ... with error badges "no interface expected here" and "incompatible types". Once "extends" is changed to "implements", it works just fine.
*** This bug has been marked as a duplicate of bug 172723 ***