public async Task ValidateAsync_IsValidShouldBeFalse_When_AsyncValidationDelegateReturnsFalse()
{
var v = new ReactiveValidatableObject <string>();
v.Validations.Add(new ActionAsyncValidationRule <string>(arg => { return(Task.FromResult(false)); }, "You have entered an invalid email"));
Assert.True(v.IsValid);
v.Value = "*****@*****.**";
await v.ValidateAsync();
v.Errors.CollectionChanged += (sender, e) =>
{
Assert.False(v.IsValid);
Assert.True(v.Errors.Contains("You have entered an invalid email"));
};
}
