IsTestNGTestClass fails to detect test classes with non-public @Test methods

[sbrannen]

If a TestNG test class has only non-public @Test methods, an attempt to discover tests for that class will find zero tests when the TestNGTestEngine is discovering tests from classes scanned from the classpath.

Changing at least one of the @Test methods to public allows all tests in the class to be detected.

Thus, org.junit.support.testng.engine.IsTestNGTestClass needs to be revised to use candidateClass.getDeclaredMethods() instead of candidateClass.getMethods(), and it will then also need to manually traverse up the type hierarchy in search of @Test methods.

[sbrannen]

Maybe org.junit.platform.commons.support.AnnotationSupport.findAnnotatedMethods(Class<?>, Class<? extends Annotation>, HierarchyTraversalMode) could be used.

Or does that search algorithm do too much with regard to TestNG's standard algorithm?