在Java中进行单元测试时，如何强制调用SQLException？

Question

I am running Java tests on JUnit 4.xx. I'm trying to force run a SQLException from the try block. I've ran Mockito in many different ways but I don't get the result that I want.

Here is my main file:

public boolean close()   {

    if (connection == null) {
        throw new IllegalStateException("Connection never initialized!");
    }

    try {
        connection.close();
        return true;
    }

    catch (SQLException e)
    {
        LOGGER.logp(Level.INFO, CLASS_NAME, "close", e.getMessage());
        return false;
    }

}

Here is my test file:

@Test
public void testFail2() throws SQLException {

    JDBCConnection spyConnect = mock(JDBCConnection.class);

    given(spyConnect.getConnection()).willAnswer(invocationOnMock -> new SQLException());

    assertFalse(spyConnect.close());
}

In summary, how do I get the catch block to get executed so that I get 100% line coverage for my overall program? Thanks for the help in advance.

Answer 1

如果要让模拟程序引发异常，则应使用willThrow ，而不是willAnswer ：

given(spyConnect.getConnection()).willThrow(new SQLException());