public void WhenManuallyInvalidated_IsInvalid()
{
Proactive <int> proactive = new Proactive <int>(42);
Reactive <int> reactiveBeingTested = new Reactive <int>(() => proactive);
int triggerValueUpdate = reactiveBeingTested.Value;
Assert.That(reactiveBeingTested.IsValid, "The reactive was not valid after initial construction. ");
reactiveBeingTested.Invalidate();
Assert.That(reactiveBeingTested.IsValid == false, "The reactive was not marked as invalid after being invalidated.");
TestContext.WriteLine($"The {nameof(Reactive)} was valid => {reactiveBeingTested.IsValid}");
}