我写了一个工厂来产生java.sql.Connection对象:
public class MySQLDatabaseConnectionFactory implements DatabaseConnectionFactory {
@Override public Connection getConnection() {
try {
return DriverManager.getConnection(...);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
我想验证传递给DriverManager的参数。getConnection，但我不知道如何模拟静态方法。我的测试用例使用JUnit 4和Mockito。是否有一个好的方法来模拟/验证这个特定的用例?
当前回答
我还编写了Mockito和AspectJ的组合:https://github.com/iirekm/varia/tree/develop/ajmock
你的例子是:
when(() -> DriverManager.getConnection(...)).thenReturn(...);
其他回答
我也遇到过类似的问题。根据PowerMock的mockStatic文档，接受的答案对我不起作用，直到我做出了更改:@PrepareForTest(classthatcontainsstaticmethod .class)。
我不需要使用BDDMockito。
我的类:
public class SmokeRouteBuilder {
public static String smokeMessageId() {
try {
return InetAddress.getLocalHost().getHostAddress();
} catch (UnknownHostException e) {
log.error("Exception occurred while fetching localhost address", e);
return UUID.randomUUID().toString();
}
}
}
我的测试类:
@RunWith(PowerMockRunner.class)
@PrepareForTest(SmokeRouteBuilder.class)
public class SmokeRouteBuilderTest {
@Test
public void testSmokeMessageId_exception() throws UnknownHostException {
UUID id = UUID.randomUUID();
mockStatic(InetAddress.class);
mockStatic(UUID.class);
when(InetAddress.getLocalHost()).thenThrow(UnknownHostException.class);
when(UUID.randomUUID()).thenReturn(id);
assertEquals(id.toString(), SmokeRouteBuilder.smokeMessageId());
}
}
要模拟静态方法，您应该使用Powermock查看: https://github.com/powermock/powermock/wiki/MockStatic。 Mockito不提供这种功能。
你可以读到一篇关于mockito的文章: http://refcardz.dzone.com/refcardz/mockito
稍微重构一下:
public class MySQLDatabaseConnectionFactory implements DatabaseConnectionFactory {
ConnectionSupplier connectionSupplier = () -> SupplierDriverManager.getConnection();
public void setConnSupplier(ConnectionSupplier supplier) {
this.connectionSupplier = supplier;
}
@Override
public Connection getConnection() {
try {
return connectionSupplier.conn();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
@FunctionalInterface
interface ConnectionSupplier {
Connection conn();
}
}
然后你可以使用mockito:
MySQLDatabaseConnectionFactory.ConnectionSupplier connectionSupplier = mock(MySQLDatabaseConnectionFactory.ConnectionSupplier.class);
when(connectionSupplier.conn()).thenReturn(yourMockObject);
yourConnectionFactory.setConnSupplier(connectionSupplier);
有一个简单的解决方案，使用java FunctionalInterface，然后将该接口添加为您试图进行单元测试的类的依赖项。
使用JMockit框架。这对我很管用。您不必为模拟dbconnection . getconnection()方法编写语句。只要下面的代码就足够了。
下面的@Mock是mockit。模拟方案
Connection jdbcConnection = Mockito.mock(Connection.class);
MockUp<DBConnection> mockUp = new MockUp<DBConnection>() {
DBConnection singleton = new DBConnection();
@Mock
public DBConnection getInstance() {
return singleton;
}
@Mock
public Connection getConnection() {
return jdbcConnection;
}
};
