@Override
public boolean isValid(final HelperBean bean, final ConstraintValidatorContext context) {
  context.disableDefaultConstraintViolation();

  // build a custom property path
  ConstraintViolationBuilder builder =
      context.buildConstraintViolationWithTemplate(getEscapeHelper().stripJavaEl(bean.getMessage()));
  NodeBuilderCustomizableContext nodeBuilder = null;
  for (String part : bean.getPath().split("\\.")) {
    if (nodeBuilder == null) {
      nodeBuilder = builder.addPropertyNode(part);
    }
    else {
      nodeBuilder = nodeBuilder.addPropertyNode(part);
    }
  }
  if (nodeBuilder != null) {
    nodeBuilder.addConstraintViolation();
  }

  return false;
}
 

@Test
public void shouldAscertainPropertyUniqueness() {
    final HibernateConstraintValidatorContext context = mock(HibernateConstraintValidatorContext.class);
    when(context.unwrap(HibernateConstraintValidatorContext.class)).thenReturn(context);
    when(context.addExpressionVariable(eq("nonUnique"), anyString())).thenReturn(context);
    when(context.getDefaultConstraintMessageTemplate()).thenReturn("template");
    final ConstraintViolationBuilder builder = mock(ConstraintViolationBuilder.class);
    when(context.buildConstraintViolationWithTemplate("template")).thenReturn(builder);
    when(builder.addPropertyNode(anyString())).thenReturn(mock(NodeBuilderCustomizableContext.class));

    assertThat(validator.isValid(connection, context)).isEqualTo(validity);
}
 

@Before
public void setupMocks() {
    constraintViolationBuilder = mock(ConstraintValidatorContext.ConstraintViolationBuilder.class);
    nodeBuilderCustomizableContext =
            mock(ConstraintValidatorContext.ConstraintViolationBuilder.NodeBuilderCustomizableContext.class);
    validatorContext = mock(ConstraintValidatorContext.class);

    when(validatorContext.buildConstraintViolationWithTemplate(any())).thenReturn(constraintViolationBuilder);
    when(constraintViolationBuilder.addPropertyNode(any())).thenReturn(nodeBuilderCustomizableContext);
    when(nodeBuilderCustomizableContext.addConstraintViolation()).thenReturn(validatorContext);
    doNothing().when(validatorContext).disableDefaultConstraintViolation();
}