internal void Transform_CorrectlyTransformsThePCoefficient_Test(
[Frozen] Mock <IPolesCoefficientsFactory> polesCoefficientsFactory, Mock <IAnalog> analog,
IPolesCoefficients polesCoefficients, double cutoff, LowPassTransformer lowPassTransformer)
{
var expected = polesCoefficients.P.Multiply(cutoff).ToList();
analog.SetupGet(mock => mock.Coefficients).Returns(polesCoefficients);
lowPassTransformer.Transform(analog.Object, cutoff);
polesCoefficientsFactory.Verify(
mock => mock.Build(It.IsAny <double>(), expected, It.IsAny <IReadOnlyList <Complex> >()), Times.Once);
}
internal void Transform_ReturnsTheResultOfThePolesFactory_Test(
[Frozen] Mock <IPolesCoefficientsFactory> polesCoefficientsFactory, IAnalog analog,
double cutoff, IPolesCoefficients expected, LowPassTransformer lowPassTransformer)
{
polesCoefficientsFactory.Setup(
mock =>
mock.Build(It.IsAny <double>(), It.IsAny <IReadOnlyList <Complex> >(),
It.IsAny <IReadOnlyList <Complex> >())).Returns(expected);
var actual = lowPassTransformer.Transform(analog, cutoff);
Assert.Equal(expected, actual);
}
protected BaseFilterDesign(FilterType filterType)
{
this.filterType = filterType;
this.polesCoefficientsFactory = new PolesCoefficientsFactory();
ITransformer transformer;
if (filterType == FilterType.Highpass)
{
transformer = new HighpassTransformer(this.polesCoefficientsFactory);
}
else
{
transformer = new LowPassTransformer(this.polesCoefficientsFactory);
}
this.iirProvider =
new IirProvider(
new DigitalPolesProvider(transformer, new DigitalTransformer(polesCoefficientsFactory)),
new PolynomialTransformer(new PolynomialCoefficientsFactory()));
}