public void Should_throw_if_negative_sample_rate_specified()
{
var target = new DigitalFilter();
target.FilterFunction = Substitute.For <IFilterFunction>();
target.CalculateCoefficients(1, -2);
}
public void Should_throw_if_filter_function_is_null_when_calculating_coefficients()
{
var target = new DigitalFilter();
target.FilterFunction = null;
target.CalculateCoefficients(1, 2);
}
public void Should_correctly_pass_parameters_to_filter_function()
{
var target = new DigitalFilter();
target.FilterFunction = Substitute.For <IFilterFunction>();
target.LowerCutOffFrequency = 2f;
target.UpperCutOffFrequency = 5f;
target.CalculateCoefficients(1, 3);
target.FilterFunction.Received(1).CalculateCoefficients(1, 2f, 5f, 3);
}
public void Should_return_the_result_of_filter_function()
{
var target = new DigitalFilter();
var expected = new float[] { 1f, 2f, 3f, 4f, 5f };
target.FilterFunction = Substitute.For <IFilterFunction>();
target.FilterFunction.CalculateCoefficients(
Arg.Any <int>(),
Arg.Any <float>(),
Arg.Any <float>(),
Arg.Any <int>()).Returns(expected);
target.LowerCutOffFrequency = 2f;
target.UpperCutOffFrequency = 5f;
var actual = target.CalculateCoefficients(1, 3);
CollectionAssert.AreEqual(expected, actual, new FloatComparer());
}