PowerMock 多个匹配的构造函数；（可变长度数组构造函数与无参数构造函数）

Question

我正在尝试在 ResourceConfig.class 中模拟没有参数的构造函数。碰巧 ResourceConfig 有两个构造函数：（除其他外）：

public ResourceConfig()
public ResourceConfig(Class... class)

PowerMock (1.7.3) 无法获得正确的构造函数。我认为这是一个错误；但也许有解决方案(?)

代码：

import org.glassfish.jersey.server.ResourceConfig;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import static org.powermock.api.mockito.PowerMockito.mock;
import static org.powermock.api.mockito.PowerMockito.whenNew;

@RunWith(PowerMockRunner.class)
@PrepareForTest( ResourceConfig.class )
public class WhosebugTest {


  @Test
  public void toStackOvflow2() throws Exception {

    ResourceConfig resConf = mock(ResourceConfig.class);
    whenNew(ResourceConfig.class).withNoArguments().thenReturn(resConf);

    //WHATEVER...
  }

}

这会产生：

org.powermock.reflect.exceptions.TooManyConstructorsFoundException: Several matching constructors found, please specify the argument parameter types so that PowerMock can determine which method you're referring to. Matching constructors in class org.glassfish.jersey.server.ResourceConfig were:
org.glassfish.jersey.server.ResourceConfig( )
org.glassfish.jersey.server.ResourceConfig( [Ljava.lang.Class;.class )

at org.powermock.reflect.internal.ConstructorFinder.throwExceptionWhenMultipleConstructorMatchesFound(ConstructorFinder.java:89) ...

有什么想法吗？

Answer 1

您可以抑制多个构造函数，例如：

@Test
public void toStackOvflow2() throws Exception {
    ResourceConfig resConf = mock(ResourceConfig.class);

    // suppress TooManyConstructorsFoundException
    MemberModifier.suppress(MemberMatcher.constructorsDeclaredIn(ResourceConfig.class));
    whenNew(ResourceConfig.class).withNoArguments().thenReturn(resConf);

    // verifying that the expected ResourceConfig instance is returned when using the default ctor ...
    assertSame(resConf, new ResourceConfig());
}

此测试通过：

PowerMock 1.7.3
球衣 2.26

Answer 2

可以接收 String 或 Uri 的 File class 示例：

whenNew(File.class).withParameterTypes(String.class).withArguments(any(String.class)).thenReturn(mockFile);

最佳方法（如果您知道这种情况下的字符串值）：

whenNew(File.class).withArguments(eq("SOME STRING")).thenReturn(mockFile);

PowerMock 多个匹配的构造函数；（可变长度数组构造函数与无参数构造函数）

PowerMock multiple matching constructors; (variable length array constructor vs no-param constructor)

java

junit

unit-testing

powermock

PowerMock 多个匹配的构造函数； （可变长度数组构造函数与无参数构造函数）

PowerMock multiple matching constructors; (variable length array constructor vs no-param constructor)

java

junit

unit-testing

powermock

PowerMock 多个匹配的构造函数；（可变长度数组构造函数与无参数构造函数）