it.parameters.value.set("42")
        }
        ValueSourceProviderFactory.ComputationListener computationListener = Mock()
        valueSourceProviderFactory.addComputationListener(computationListener)
        List<ObtainedValue<?, ValueSourceParameters>> obtainedValues = []
        valueSourceProviderFactory.addValueListener { value, source ->
            assert source instanceof EchoValueSource

        Action<? super ValueSourceSpec<P>> configureAction
    );

    void addValueListener(ValueListener listener);

    void removeValueListener(ValueListener listener);

    void addComputationListener(ComputationListener listener);

    void removeComputationListener(ComputationListener listener);

    <T, P extends ValueSourceParameters> Provider<T> instantiateValueSourceProvider(

    }

    @Override
    public void removeValueListener(ValueListener listener) {
        valueBroadcaster.remove(listener);
    }

    @Override
    public void addComputationListener(ComputationListener listener) {
        computationBroadcaster.add(listener);
    }

    @Override
    public void removeComputationListener(ComputationListener listener) {