### Question:
ZxingPngQrGenerator implements QrGenerator { public String getImageMimeType() { return "image/png"; } ZxingPngQrGenerator();  ZxingPngQrGenerator(Writer writer); void setImageSize(int imageSize); int getImageSize(); String getImageMimeType(); @Override byte[] generate(QrData data);  }### Answer:
@Test public void testMimeType() { assertEquals("image/png", new ZxingPngQrGenerator().getImageMimeType()); }