internal void Transform_CorrectlyReturnsTheResultOfThePolesFactory_Test(
[Frozen] Mock <IPolesCoefficientsFactory> polesCoefficientsFactory, IPolesCoefficients polesCoefficients,
IPolesCoefficients expectedCoefficients, double sampleRate, DigitalTransformer digitalTransformer)
{
polesCoefficientsFactory.Setup(
mock =>
mock.Build(It.IsAny <double>(), It.IsAny <IReadOnlyList <Complex> >(),
It.IsAny <IReadOnlyList <Complex> >())).Returns(expectedCoefficients);
var actual = digitalTransformer.Transform(polesCoefficients, sampleRate);
Assert.Equal(expectedCoefficients, actual);
}
internal void Transform_CorrectlyTransformsTheKCoefficient_Test(
[Frozen] Mock <IPolesCoefficientsFactory> polesCoefficientsFactory, IPolesCoefficients polesCoefficients,
double sampleRate, DigitalTransformer digitalTransformer)
{
var expectedK = polesCoefficients.K *
(sampleRate.Subtract(polesCoefficients.Z).Product() /
sampleRate.Subtract(polesCoefficients.P).Product());
digitalTransformer.Transform(polesCoefficients, sampleRate);
polesCoefficientsFactory.Verify(
mock =>
mock.Build(expectedK.Real, It.IsAny <IReadOnlyList <Complex> >(),
It.IsAny <IReadOnlyList <Complex> >()), Times.Once);
}
internal void Transform_CorrectlyTransformsTheZCoefficient_Test(
[Frozen] Mock <IPolesCoefficientsFactory> polesCoefficientFactory, IPolesCoefficients polesCoefficients,
double sampleRate, DigitalTransformer digitalTransformer)
{
var degree = polesCoefficients.P.Count - polesCoefficients.Z.Count;
var expectedZ = polesCoefficients.Z.Add(sampleRate).Divide(sampleRate.Subtract(polesCoefficients.Z));
var expected = new List <Complex>(expectedZ);
for (var i = 0; i < degree; i++)
{
expected.Add(-1.0d);
}
digitalTransformer.Transform(polesCoefficients, sampleRate);
polesCoefficientFactory.Verify(
mock => mock.Build(It.IsAny <double>(), It.IsAny <IReadOnlyList <Complex> >(), expected), Times.Once);
}
