@Test
  public void testInBitmap() throws Throwable {
    Bitmap inBitmap = Bitmap.createBitmap(20, 20, Bitmap.Config.ARGB_8888);

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inBitmap = inBitmap;

    final Bitmap outBitmap =
        mWebpBitmapFactory.decodeStream(getTestWebpInputStream(), null, options);

    // NULLSAFE_FIXME[Parameter Not Nullable]
    assertNotNull("Bitmap should not be null", outBitmap);
    // NULLSAFE_FIXME[Parameter Not Nullable]
    assertSame("Output bitmap shuold be the same as input bitmap", inBitmap, outBitmap);
    assertEquals(
        "Bitmap pixels should be red",
        0xFFFF0100,
        Preconditions.checkNotNull(outBitmap).getPixel(5, 8));
  }
Return input stream for lossless webp

@return InputStream instance
static-webp/src/androidTest/java/com/facebook/webpsupport/WebpBitmapFactoryTest.java