Junit：单元测试和编码的协作

 public class ComplexTest extends TestCase {

              private Complex a;

              private Complex b;

              protected void setUp() {

                     a = new Complex(1, -1);

                     b = new Complex(2, 5);

              }

       }

       （b）

       public void testComplexEquality()

              Complex expected = new Complex(1, -1);

              assertEquals(expected, a);

       }

       public void testComplexAddition() {

              Complex expected = new Complex(3, 4);

              assertEquals(expected, a.add(b));

       }

       public void testComplexMultiplication() {

              Complex expected = new Complex(1*2 - (-1)*5,1*5 + (-1)*2);

              assertEquals(expected, a.multiply(b));

       }

（c）

       public static Testsuite() {

              return new TestSuite(ComplexTest.class);

      }

        Figure 1 一个复数类例子：（a）JUnit测试的setup，（b）JUnit测试的实例，（c）在一个类中为所有实例动态得创建一个测试组（test suite）

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