Creation of a custom form control with validation

[jrdutton]

I have attempted to create a custom form control.

Razor file

@inherits BaseInputComponent<string>
@(this.ChildContent)
@(this.Feedback)

Code behind

    public partial class Test : BaseInputComponent<string>
    {
        [Parameter]
        public string Text { get; set; }

        [Parameter]
        public EventCallback<string> TextChanged { get; set; }

        [Parameter]
        public Expression<Func<string>> TextExpression { get; set; }

        protected override string DefaultValue => string.Empty;

        protected override string InternalValue
        {
            get => this.Text;
            set => this.Text = value;
        }

        public override async Task SetParametersAsync(ParameterView parameters)
        {
            if (this.Rendered)
            {
                if (parameters.TryGetValue<string>(nameof(this.Text), out var paramText) && !paramText.IsEqual(this.Text))
                {
                    this.ExecuteAfterRender(this.Revalidate);
                }
            }

            await base.SetParametersAsync(parameters);

            if (this.ParentValidation is not null)
            {
                await this.InitializeValidation();
            }
        }

        protected override Task OnInternalValueChanged(string value)
        {
            return this.TextChanged.InvokeAsync(value);
        }

        protected override Task<ParseValue<string>> ParseValueFromStringAsync(string value)
        {
            return Task.FromResult(new ParseValue<string>(true, value, null));
        }
    }

I simply cannot get validation working.

<Validations HandlerType="typeof(FluentValidationHandler)" Mode="@(ValidationMode.Auto)" Model="@(this.model)" @ref="@(this.validationsRef)" ValidateOnLoad="@(false)">
    <Validation>
        <Field>
            <Test @bind-Text="@(this.model.Text)">
                <Feedback>
                    <ValidationError></ValidationError>
                </Feedback>
            </Test>
        </Field>
    </Validation>
</Validations>

Is this possible to get working?
And if so, what am I missing?
Thank you