verify(graphDisplay, times(1)).setArcStyle(eq(arc),
eq(ArcSettings.ARC_COLOR), eq(arcColor.toHex()));
Color newColor = new Color("#ff0000");
underTest.getArcItemContainer(arcTypeId).setArcColor(newColor.toHex());
verify(graphDisplay, times(1)).setArcStyle(eq(arc),
eq(ArcSettings.ARC_COLOR), eq(newColor.toHex()));
}