Mockito:mockStatic.when().then Throw()行为

我正在为一个抛出各种异常的方法编写测试。这个测试用例是抛出SQLException,我注意到了这些行为。

@Test
public void testGetPreparedStatement_throwsSQLException() throws Exception {
    try (MockedStatic<DriverManager> mockedDriverManager = mockStatic(DriverManager.class)) {
        // Throws org.mockito.exceptions.misusing.UnfinishedStubbingException
        mockedDriverManager.when(() -> DriverManager.getConnection(anyString(), anyString(), anyString()))
                .thenThrow(new SQLException("some message"));

        assertThrows(SQLException.class, () -> ((RequestDBServiceJDBC) RequestDBServiceJDBC.getInstance())
                .getPreparedStatement(new RequestCriteria()));
    }
}

// But somehow this works:
SQLException sqlException = new SQLException("some message");
mockedDriverManager.when(() -> DriverManager.getConnection(anyString(), anyString(), anyString()))
    .thenThrow(sqlException);

错误:

org.mockito.exceptions.misusing.UnfinishedStubbingException: 
Unfinished stubbing detected here:
-> at at com.devcenter.myproject.request.service.jdbc.RequestDBServiceJDBCTest.testGetPreparedStatement_throwsSQLException(RequestDBServiceJDBCTest.java:206)

E.g. thenReturn() may be missing.
Examples of correct stubbing:
    when(mock.isOk()).thenReturn(true);
    when(mock.isOk()).thenThrow(exception);
    doThrow(exception).when(mock).someVoidMethod();
Hints:
 1. missing thenReturn()
 2. you are trying to stub a final method, which is not supported
 3. you are stubbing the behaviour of another mock inside before 'thenReturn' instruction is completed

    at java.sql/java.sql.DriverManager.getLogWriter(DriverManager.java:129)
    at java.sql/java.sql.SQLException.<init>(SQLException.java:125)
    at com.devcenter.myproject.request.service.jdbc.RequestDBServiceJDBCTest.testGetPreparedStatement_throwsSQLException(RequestDBServiceJDBCTest.java:207)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

对此有什么解释吗?