PowerMock whenNew Alternative

Question

I don't want to use powermock anymore. Because junit5 started mocking static classes. So i am trying to get rid of powermock methods.

As you know, you can create an instance of a class with whenNew keyword.

Is there any alternative in Junit5 for whenNew?

Here is a part of my code:

                whenNew(PDFDocument.class).withNoArguments().thenReturn(pdfDocument);
                whenNew(PSConverter.class).withNoArguments().thenReturn(converter);
                doNothing().when(pdfDocument).load(ArgumentMatchers.any(ByteArrayInputStream.class));
                doAnswer(invocationOnMock -> {
                    ByteArrayOutputStream outputStream = invocationOnMock.getArgument(1);
                    outputStream.write(content);
                    return outputStream;
                }).when(converter).convert(ArgumentMatchers.any(), ArgumentMatchers.any(ByteArrayOutputStream.class));