Spring ApplicationContext for integration test from the test itself

Spring's website gives the following ways to initialize context for integration tests:

@ContextConfiguration("/test-config.xml")
public class XmlApplicationContextTests {
    // class body...
}

and

@ContextConfiguration(classes = TestConfig.class)
public class ConfigClassApplicationContextTests {
    // class body...
}

But for both ways I have to create a second file, either xml or java class, which seems to be redundant for a small test.

Question: Is there a way to configure context right inside the test class itself? I tried to put both @Configuration & @ComponentScan(...) and @ContextConfiguration(classes = MyTestClass.class) on MyTestClass, but it fails to load.