Mockito Checked異常對此方法無效

Question

嘗試使用此模擬程序時，出現錯誤Checked exception is invalid for this method ：

InitialContext mockContext;
mockContext = mock(InitialContext.class);
when((DataSource) mockContext.lookup("java:comp/env/jdbc/foo")).thenThrow(new ConnectionFactoryException("test")); // <-- Fails on this line

@Test
public void shouldThrowExceptionIfDataSourceDoesNotExist() throws ConnectionFactoryException {
    assertThatExceptionOfType(ConnectionFactoryException.class)
        .isThrownBy(() -> { new DataSourceFactory(mockContext).getDataSource("foo"); })
        .withMessage("Unable to find jdbc/foo");
}

我要測試的課程：

public class DataSourceFactory {

    // Dependencies to be injected
    private InitialContext context;

    public DataSourceFactory(InitialContext context) throws ConnectionFactoryException {

        if(context == null) {
            throw new ConnectionFactoryException("context can't be null");
        }

        this.context = context;
    }

    public DataSource getDataSource(String dataSourceName) throws ConnectionFactoryException {

        if(dataSourceName == null) {
            throw new ConnectionFactoryException("dataSourceName can't be null");
        }

        // Ensure we have the correct syntax for the datasource name
        if(!dataSourceName.startsWith("jdbc/")) {
            dataSourceName = "jdbc/" + dataSourceName;
        }

        try {
            System.out.println("java:comp/env/" + dataSourceName);
            DataSource dataSource = (DataSource) context.lookup("java:comp/env/" + dataSourceName);
            return dataSource;
        } catch (NamingException e) {
            throw new ConnectionFactoryException("Unable to find " + dataSourceName, e);
        }
    }
}

我知道我已經讀過我不應該模擬我不擁有的對象，但是我不知道如何在不模擬InitialContext情況下測試getDataSource()方法。

Answer 1

lookup確實不會引發ConnectionFactoryException您的代碼會引發。 相反，您應該拋出正確的異常NamingException ，並測試您的代碼是否按預期處理了該異常（即，拋出ConnectionFactoryException`）：

when(mockContext.lookup("java:comp/env/jdbc/foo"))
    .thenThrow(new NamingException("test"));