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PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.

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In JUnit 3, the framework executed all methods which started with the word test as a unit test. 
In JUnit 4, only methods annotated with the @Test annotation are executed. Example: 
public class MyTest {
    public void testBad() {
        doSomething();
    }

	@Test
    public void testGood() {
        doSomething();
    }
}