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SlingHttpServletResponse.getOutStream is coming as null while running the test case
getOutputStream is used for writing the binary content. If I understand your usecase correctly you are trying to read from the servlet response. In this case you can do something like -
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(response.getOutput());BufferedImage image = ImageIO.read(byteArrayInputStream);
and then you can read metadata from the image object.