Mock URL

[MohanR]

Hi,

             I have this class that tries to mock a URL connection. It is a known example. Get an error.

java.lang.AssertionError: Wanted but not invoked java.net.URL(
    "http",
    "localhost",
    80,
    "POST"
);
Actually, there were zero interactions with this mock.

 

Thanks,

Mohan

public class TestPrintServer {

    /**

     * URL mock.

     */

    private URL url;

    /**

     * HttpURLConnection mock.

     */

    private HttpURLConnection connection;

    private NettyServer instance = new NettyServer();

private ByteArrayInputStream input = new ByteArrayInputStream( 

new Gson().toJson(

new PassBook()).getBytes() );

private ByteArrayOutputStream output = new ByteArrayOutputStream();

    @Before

    public void setUp() throws Exception

    {

        this.url = PowerMockito.mock(URL.class);

        this.connection = PowerMockito.mock(HttpURLConnection.class);

        PowerMockito.whenNew(URL.class).

        withArguments( "http", "localhost", 80, "POST" ).thenReturn(this.url);

    }

    @Test

    public void testDoPost() throws Exception

    {

        PowerMockito.doReturn(this.connection).when(this.url).openConnection();

        PowerMockito.doReturn(this.output).when(this.connection).getOutputStream();

        PowerMockito.doReturn(this.input).when(this.connection).getInputStream();

        PowerMockito.verifyNew(URL.class);

        final String response = this.instance.doPost("POST", new Gson().toJson(

new PassBook()));

        // Mockito.verify(this.url).openConnection(); // cannot be verified (mockito limitation) 

        Mockito.verify(this.connection).getOutputStream();

        Mockito.verify(this.connection).setRequestMethod("POST");

        Mockito.verify(this.connection).setRequestProperty("Content-Type", "application/xml");

        Mockito.verify(this.connection).setUseCaches(false);

        Mockito.verify(this.connection).setDoInput(true);

        Mockito.verify(this.connection).setDoOutput(true);

        Mockito.verify(this.connection).getInputStream();

        JsonParser parser = new JsonParser();

        //assertEquals(this.output, input);    

    }

    

class PassBook{

   

    private String name = "Test";

   

    private double balance = 17989.99;

    }

@Data class NettyServer{

   private String doPost(String string, String input) throws MalformedURLException {

       new URL("http", "localhost", 80, "POST");

return "{\"status\":1}";

}

}

}

[Johan Haleby]

I can't see that you prepare anything for test using the @PrepareForTest annotation? In case of system classes you need to use this approach.

/Johan

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[MohanR]

@RunWith(PowerMockRunner.class)

@PrepareForTest({ NettyServer.class, URL.class, HttpURLConnection.class })

public class TestPrintServer {

That is done.

Thanks.

[Johan Haleby]

Are you trying to mock stuff the "doPost" method in the PassBook class? You try to verify a field in your test code called this.url but it's never set from the actual code!? That won't work.

[MohanR]

Hi,

            I was trying to mock a URL so that when I open a mock connection(  new URL("http", "localhost", 80, "POST").openConnection();)

and post I get a particular response. I am trying to do this with PowerMock and PowerMockito.

Thanks.

 

@RunWith(PowerMockRunner.class)

@PrepareForTest({ TestPrintServer.class})

public class TestPrintServer {

    private NettyServer instance = new NettyServer();

private ByteArrayInputStream input = new ByteArrayInputStream( 

new Gson().toJson(

new PassBook()).getBytes() );

    private URL url;

    private InputStream inputStream;

private ByteArrayOutputStream output = new ByteArrayOutputStream();

@Before

    public void setUp() throws MalformedURLException {

            //url = createMock(URL.class);

    }

@Test

    public void testNetty() throws Exception {

        //new URL("http", "localhost", 80, "POST").openConnection();

   }

class PassBook{

   

    private String name = "Test";

   

    private double balance = 17989.99;

    }

}

class NettyServer{

    public String doPost(String string, String input) throws IOException {

  return "{\"status\":1}";

}

}

[Johan Haleby]

I see, you can mock new instances of URL if you do something like this:

// Given

final URL url = mock(URL.class);

whenNew(URL.class).withArguments("some_url").thenReturn(url);

// When

final URL actual = new SystemClassUser().newURL("some_url");

// Then

assertSame(url, actual);

The newURL method simply looks like this:

public URL newURL(String anUrl) throws MalformedURLException {

        return new URL(anUrl);

}

You need to make sure that your equivalent of SystemClassUser.class is prepared for test for this to work.

/Johan

[MohanR]

This results is this trace 

org.mockito.exceptions.base.MockitoException: 
Mockito cannot mock this class: class replica.java.net.URL$$PowerMock0
Mockito can only mock visible & non-final classes.
If you're not sure why you're getting this error, please report to the mailing list.
at org.powermock.api.mockito.internal.mockcreation.MockCreator.createMethodInvocationControl(MockCreator.java:100)

 

@RunWith(PowerMockRunner.class)

@PrepareForTest({ PrintPassBook.class, URL.class})

public class TestPrintServer {

    private String realUrl;

    

    public final URL url = PowerMockito.mock(URL.class);

   @Before

    public void setUp() throws Exception {

 

         realUrl = "http://localhost:9090";

         

         PowerMockito.whenNew(URL.class).withArguments( realUrl ).thenReturn(url);

    }

@Test

public void testUrl() throws MalformedURLException{

        final URL actual = new PrintPassBook().newURL(realUrl);

        Assert.assertSame(url, actual);

}

}

public class PrintPassBook {

[Johan Haleby]

I don't think you can call PowerMockito.mock(URL.class) during field initialization. Try move it to the setup method and if that doesn't work then move it to the testUrl method.

Regards,

/Johan

[MohanR]

Thanks. It  Worked.

Mohan

[Johan Haleby]

Great!