我想用Android提供的一些代码验证电子邮件.

这是我要模拟的代码：

 if(!Patterns.EMAIL_ADDRESS.matcher(email).matches())
      throw new InvalidPhoneException(phone);

在我的测试文件中：

@RunWith(PowerMockRunner.class)
@PrepareForTest({ Patterns.class })
public class UserTest {

    @Before
    public void mockValidator() {
        mockStatic(Patterns.class);
        when(Patterns.EMAIL_ADDRESS.matcher(any(String.class)).matches()).thenReturn(true);
    }

启动测试时出现此错误：

java.lang.NullPointerException
    at ch.mycompany.myapp.model.UserTest.mockValidator(UserTest.java:59)

编辑1：

我试过了 ：

    mockStatic(Patterns.class);
    Field field = PowerMockito.field(Patterns.class, "EMAIL_ADDRESS");
    field.set(Patterns.class, mock(Pattern.class));

    // prepare matcher
    Matcher matcher = mock(Matcher.class);
    when(matcher.matches())
            .thenReturn(true);

    // final mock
    when(Patterns.EMAIL_ADDRESS.matcher(any(String.class)))
            .thenReturn(matcher);

但是当我这样做时,我的代码(Patterns.EMAIL_ADDRESS.matcher(email).matches())
返回始终为假.这很混乱.

解决方法:

您正在验证电子邮件字段

您不会在此处嘲笑何时返回true或false的行为.还请注意,我们无法模拟最终课程(模式).

当正则表达式模式与值匹配时,它返回true或false

而不是使事情复杂化.只需通过传递值来执行评估.

解决方案1：

     @Test
        public void test() throws Exception{            
            String email="hello@gmail.com";         
            System.out.println(Patterns.EMAIL_ADDRESS.matcher(email).matches());    

        }



 protected static class Patterns{


            private static final String EMAIL_PATTERN =
                    "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
                    + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
            private static final Pattern EMAIL_ADDRESS=Pattern.compile(EMAIL_PATTERN);



        }
output :

true

解决方案2：模拟Matcher行为以返回true或false

 @RunWith(PowerMockRunner.class)
    @PrepareForTest({Pattern.class,Matcher.class})
    public class TestEmailPattern {


            @Test
            public void test() throws Exception{            
                String email="hello@gmail.com";         
                Pattern pattern=PowerMockito.mock(Pattern.class);
                Matcher matcher=PowerMockito.mock(Matcher.class);
                PowerMockito.when(matcher.matches()).thenReturn(true);      
                assertEquals(Patterns.EMAIL_ADDRESS.matcher(email).matches(),true); 
            }

            protected static class Patterns{


                private static final String EMAIL_PATTERN =
                        "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
                        + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
                private static final Pattern EMAIL_ADDRESS=Pattern.compile(EMAIL_PATTERN);



            }


    }