Android单元测试抛空指针异常

Question

我正在尝试测试有效性函数。我的功能是这样的：


class InvalidCredentialException(message: String) : Exception(message)


@Throws
fun credentialValidityChecker(email: String, password: String, nameAndFamily: String? = null) {
    when {
        email.isBlank() -> {
            throw InvalidCredentialException("Email address can't left blank.")
        }
        !Patterns.EMAIL_ADDRESS.matcher(email)
            .matches() -> {
            throw InvalidCredentialException("Email address format is not correct.")
        }
        password.isBlank() -> {
            throw InvalidCredentialException("Password can't left blank.")
        }
        password.length < 5 -> {
            throw InvalidCredentialException("Password should have at least 5 characters.")
        }
        nameAndFamily != null -> {
            if (nameAndFamily.isBlank())
                throw InvalidCredentialException("Name and family can't left blank.")
        }
    }
}

如果用户凭据出现任何问题，我会使用此函数进行抛出。否则，什么也不会发生，代码继续。异常在其他应用层处理。这是我的测试用例：


class CredentialValidityTest {

    @Test
    fun emptyEmail_raiseEmptyEmailException() {
        try {
            credentialValidityChecker(email = "", password = "12345")
            fail("Empty email should raise exception.")
        } catch (e: InvalidCredentialException) {
            assertThat(e.message).isEqualTo("Email address can't left blank.")
        }
    }

    @Test
    fun wrongFormatEmail_raiseWrongEmailException() {
        val wrongFormatEmailList = listOf(
            "test", "test@", "test@application",
            "test@application.", "test@.", "test.application@com"
        )
        for (email in wrongFormatEmailList)
            try {
                credentialValidityChecker(email = email, password = "12345")
                fail("Wrong format email should raise exception.")
            } catch (e: InvalidCredentialException) {
                assertThat(e.message).isEqualTo("Email address format is not correct.")
            }
    }

    @Test
    fun emptyPassword_raiseEmptyPasswordException() {
        try {
            credentialValidityChecker(email = "test@application.com", password = "")
            fail("Empty password should raise exception.")
        } catch (e: InvalidCredentialException) {
            assertThat(e.message).isEqualTo("Password can't left blank.")
        }
    }

    @Test
    fun weakPassword_raiseWeakPasswordException() {
        try {
            credentialValidityChecker(email = "test@application.com", password = "1234")
            fail("weak password should raise exception.")
        } catch (e: InvalidCredentialException) {
            assertThat(e.message).isEqualTo("Password should have at least 5 characters.")
        }
    }

    @Test
    fun emptyNameAndFamily_raiseEmptyNameAndFamilyException() {
        try {
            credentialValidityChecker(
                email = "test@application.com",
                password = "12345",
                nameAndFamily = ""
            )
            fail("Empty name and family should raise exception.")
        } catch (e: InvalidCredentialException) {
            assertThat(e.message).isEqualTo("Name and family can't left blank.")
        }
    }

}

问题是：

只有第一个测试用例通过，它检查电子邮件不为空。其他测试用例因 java.lang.NullPointerException 错误而失败。有什么问题？

Answer 1

尝试使用 PatternsCompat.EMAIL_ADDRESS 而不是 Patterns.EMAIL_ADDRESS

Android单元测试抛空指针异常

Android unit test throw null pointer exception

testing

android

unit-testing

nullpointerexception

android-testing