Question

对于单元测试目的，我想为javax.security.auth.kerberos.KerberosTicket实例提供一个模拟。我尝试使用Mockito和PowerMockito，但两个都失败了，并发布了类似的消息：

org.mockito.exceptions.misusing.MissingMethodInvocationException: 
when() requires an argument which has to be 'a method call on a mock'.
For example:
    when(mock.getArticles()).thenReturn(articles);

Also, this error might show up because:
1. you stub either of: final/private/equals()/hashCode() methods.
   Those methods *cannot* be stubbed/verified.
2. inside when() you don't call method on mock but on some other object.

添加@RunWith和@PrepareForTest注释导致以下LinkageException：

java.lang.LinkageError:
  loader constraint violation: 
  when resolving method "sun.security.jgss.krb5.Krb5Util.getTicketFromSubjectAndTgs(ILjava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/security/AccessControlContext;)Ljavax/security/auth/kerberos/KerberosTicket;"
  the class loader (instance of org/powermock/core/classloader/MockClassLoader) of the current class, 
  org/epo/security/spnego/impl/KerberosUtilsTest, and the class loader (instance of <bootloader>) 
  for resolved class, sun/security/jgss/krb5/Krb5Util, have different Class objects 
  for the type javax/security/auth/kerberos/KerberosTicket used in the signature

我的测试类看起来像这样：

@RunWith(PowerMockRunner.class)

@PrepareForTest（{KerberosTicket.class}）公共类KerberosUtilsTest {

@Test
public void testGetTicketFromSubjectAndTgs() throws LoginException, KrbException, IOException {
    PowerMockito.mockStatic(Krb5Util.class);
    KerberosTicket kerberosTicketMock = PowerMockito.mock(KerberosTicket.class);

    AccessControlContext controlContext = AccessController.getContext();

    // Causes the LinkageError to be thrown
    when(Krb5Util.getTicketFromSubjectAndTgs(-1, "test", "test", "test", controlContext)).thenReturn(
                kerberosTicketMock);

    KerberosTicket actual = new KerberosUtils().getTicketFromSubjectAndTgs(-1, "test", "test", "test",
                controlContext);

    assertEquals(kerberosTicketMock, actual);
}

搜索互联网显示可以通过更改注释来修复LinkageError：

@PowerMockIgnore({"sun.security.jgss.krb5.Krb5Util", "javax.security.auth.kerberos.KerberosTicket"})
@PrepareForTest({KerberosUtils.class})
@RunWith(PowerMockRunner.class)

运行这个让我回到原点：

org.mockito.exceptions.misusing.MissingMethodInvocationException: 
when() requires an argument which has to be 'a method call on a mock'.
For example:
    when(mock.getArticles()).thenReturn(articles);

Also, this error might show up because:
1. you stub either of: final/private/equals()/hashCode() methods.
   Those methods *cannot* be stubbed/verified.
2. inside when() you don't call method on mock but on some other object.

有人有解决方案吗？

Answer 1

KerberosTicket的大部分方法都是final，但PowerMockito应该可以嘲笑它们。

不要忘记按照PowerMockito的要求注释您的测试类来模拟final方法

@RunWith(PowerMockRunner.class)
@PrepareForTest(KerberosTicket.class)

并在测试中使用PowerMockito代替Mockito

KerberosTicket mock = PowerMockito.mock(KerberosTicket.class);
PowerMockit.when(mock.getAuthTime().thenReturn(...);

如何模拟KerberosTicket实例？

1 个答案: