public void Should_raise_changed_event_when_upper_cutoff_frequency_changed()
{
var changed = false;
var target = new DigitalFilter();
target.Changed += (o, e) => { changed = true; };
target.UpperCutOffFrequency = 7f;
Assert.IsTrue(changed);
}
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_correctly_store_state()
{
var target = new DigitalFilter();
var expectedFilterFunction = Substitute.For<IFilterFunction>();
target.LowerCutOffFrequency = 1f;
target.UpperCutOffFrequency = 2f;
target.FilterFunction = expectedFilterFunction;
Assert.AreEqual(1f, target.LowerCutOffFrequency, FloatComparer.Epsilon);
Assert.AreEqual(2f, target.UpperCutOffFrequency, FloatComparer.Epsilon);
Assert.AreEqual(expectedFilterFunction, target.FilterFunction);
}
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());
}
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_throw_if_upper_cutoff_frequency_is_negative()
{
var target = new DigitalFilter();
target.UpperCutOffFrequency = -1f;
}
public void Should_throw_if_negative_sample_rate_specified()
{
var target = new DigitalFilter();
target.FilterFunction = Substitute.For<IFilterFunction>();
target.CalculateCoefficients(1, -2);
}