### Question:
RelativePositionerView extends View { public Property<HorizontalAnchor> horizontalAnchor() { return getProp(HORIZONTAL_ANCHOR); } RelativePositionerView(View... views); Property<Vector> relativeTo(); Property<HorizontalAnchor> horizontalAnchor(); Property<VerticalAnchor> verticalAnchor();  }### Answer:
@Test public void horizontalLeft() { positionerView.horizontalAnchor().set(RelativePositionerView.HorizontalAnchor.LEFT); assertBounds(0, 15, 10, 20); }
@Test public void horizontalRight() { positionerView.horizontalAnchor().set(RelativePositionerView.HorizontalAnchor.RIGHT); assertBounds(-10, 15, 10, 20); }
@Test public void horizontalCenter() { positionerView.horizontalAnchor().set(RelativePositionerView.HorizontalAnchor.CENTER); assertBounds(-5, 15, 10, 20); }