if (!e.finishedBands()) do {
assertFalse(a.finishedBands());
final float pe = e.getSampleFloat();
final float pa = a.getSampleFloat();
assertEquals(pe, pa, EPS);
a.nextBand();
} while (!e.nextBandDone());
assertTrue(a.finishedBands());
a.nextPixel();
a.startBands();
e.startBands();