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Junit provides a set of methods to assert tests.

Here are some examples on how to use the class org.junit.Assert:

	// Check with equals() that two objects are identical
	Assert.assertEquals(expectedResult, actualResult);
	
	// Check with equals() that two objects are different
	Assert.assertNotEquals(expectedResult, actualResult);

	// Check that the condition is true
	Assert.assertTrue(result);

	// Check that the condition is false
	Assert.assertFalse(result);

	// Check that the result is null
	Assert.assertNull(obj);

	// Check that the result is not null
	Assert.assertNotNull(obj);

	// Check with == that two objects are the same
	Assert.assertSame(expectedResult, actualResult);

	// Check with == that two objects are not the same
	Assert.assertNotSame(expectedResult, actualResult);

	// Check that two arrays are identical
	Assert.assertArrayEquals(expectedArr, actualArr);

	// Check any condition using matchers
	Assert.assertThat(actualResult, Matchers.equalTo(expectedResult));

assertThat() offers some advantages as readability and flexibility. However JUnit has a limited set of matchers and you need a library called Hamcrest, if you want more.