追求代碼質量: 用 AOP 進行防御性編程

				
import java.util.Vector;
import static org.testng.Assert.assertEquals;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

public class BuildHierarchyTest {
	
 @DataProvider(name = "class-hierarchies")
 public Object[][] dataValues(){
  return new Object[][]{
   {Vector.class, new String[] {"java.util.AbstractList", 
      "java.util.AbstractCollection"}},
   {String.class, new String[] {}}
  };
 }

 @Test(dataProvider = "class-hierarchies"})
 public void verifyHierarchies(Class clzz, String[] names) throws Exception{
  Hierarchy hier = HierarchyBuilder.buildHierarchy(clzz);
  assertEquals(hier.getHierarchyClassNames(), names, "values were not equal");
 }
}