验证电子邮件时出现NullPointerException

Question

我正在编写一个单元测试来检查电子邮件验证逻辑.运行测试时,逻辑是抛出空指针异常.但它适用于模拟器.有人可以帮我解决这个问题吗？

public static String validate(String email, String password) {
        if (email == null || email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
            return "Enter valid email address";
        }
        if (password.isEmpty() || password.length() < 4) {
            return "Password should be between 4 and 10 alphanumeric characters";
        }
        return null;
}

以下是我的单元测试.

@Test
public void validateShouldReturnMessageIfYouPassAnInvalidEmail() throws Exception {
    String validateMessage = LoginService.validate("abcdef", "password");
    assertEquals("Enter valid email address", validateMessage);
}

我得到的错误是,

java.lang.NullPointerException
at com.tryout.hemanth.expensetracker.service.LoginService.validate(LoginService.java:11)

Answer 1

使用PatternsCompat而不是Patterns

Answer 2

android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()自 API 级别 8 起就存在，可能您的模拟器早于此。

所以我建议EMAIL_ADDRESS_PATTERN按照此答案中的建议添加自定义字符串并进行检查

if (email == null || email.isEmpty() || !EMAIL_ADDRESS_PATTERN.matcher(email).matches()){
     return "Enter valid email address";
}