assertEquals(MinLengthConstraint.class, v.getConstraint().getClass());
// new context that contains previous
ValidationContext vctx2 = new ValidationContext();
vctx2.add(new Check("foo", new AssertValidConstraint(vctx)));
vtor = new Vtor();
vtor.validate(vctx2, new Boo());
vlist = vtor.getViolations();