@Test public void wholePositiveNumberShouldPassIfEmpty() { assertTrue(ModelUtils.isWholePositiveNumber("")); }
static boolean isWholePositiveNumber(@Nullable String value) { return value != null && TextUtils.isDigitsOnly(value); }
ModelUtils { static boolean isWholePositiveNumber(@Nullable String value) { return value != null && TextUtils.isDigitsOnly(value); } }
ModelUtils { static boolean isWholePositiveNumber(@Nullable String value) { return value != null && TextUtils.isDigitsOnly(value); }  }
ModelUtils { static boolean isWholePositiveNumber(@Nullable String value) { return value != null && TextUtils.isDigitsOnly(value); }   }
ModelUtils { static boolean isWholePositiveNumber(@Nullable String value) { return value != null && TextUtils.isDigitsOnly(value); }    }