Files
QuanTAlib/lib/momentum/cfb/Cfb.Tests.cs
T
2026-01-25 16:01:45 -08:00

300 lines
8.2 KiB
C#

namespace QuanTAlib;
public class CfbTests
{
[Fact]
public void Constructor_EmptyLengths_UsesDefaults()
{
// Cfb uses default lengths (2, 4, ..., 192) when given empty or null lengths
var cfb = new Cfb(Array.Empty<int>());
Assert.NotNull(cfb);
Assert.Equal("Jurik Composite Fractal Behavior", cfb.Name);
}
[Fact]
public void Constructor_CustomLengths_Works()
{
// Cfb accepts custom lengths
var cfb = new Cfb(new[] { 5, 10, 20 });
Assert.NotNull(cfb);
Assert.Equal("Jurik Composite Fractal Behavior", cfb.Name);
}
[Fact]
public void BasicCalculation_DoesNotCrash()
{
var cfb = new Cfb();
var gbm = new GBM();
var bars = gbm.Fetch(1000, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
var data = bars.Close;
for (int i = 0; i < data.Count; i++)
{
cfb.Update(new TValue(data.Times[i], data.Values[i]));
}
Assert.True(cfb.Last.Value >= 1.0);
}
[Fact]
public void PerfectTrend_IncreasesCfb()
{
// Use small lengths for easier testing
int[] lengths = { 4, 8, 12 };
var cfb = new Cfb(lengths);
// Feed a perfect uptrend
for (int i = 0; i < 50; i++)
{
cfb.Update(new TValue(DateTime.UtcNow, i));
}
Assert.Equal(8.0, cfb.Last.Value);
}
[Fact]
public void FlatLine_ReturnsOne()
{
var cfb = new Cfb();
for (int i = 0; i < 100; i++)
{
cfb.Update(new TValue(DateTime.UtcNow, 100.0));
}
// NetMove is 0. TotalMove is 0.
// Ratio = 0/0 -> NaN?
// Code handles TotalMove < 1e-12 by skipping.
// So no lengths qualify.
// Decay logic kicks in.
// Should decay to 1.0.
Assert.Equal(1.0, cfb.Last.Value);
}
[Fact]
public void ZigZag_ReturnsOne()
{
var cfb = new Cfb([4, 8]);
// 100, 101, 100, 101...
// NetMove(4) = Abs(100 - 100) = 0. Ratio = 0.
// NetMove(8) = 0. Ratio = 0.
for (int i = 0; i < 100; i++)
{
double price = 100 + (i % 2);
cfb.Update(new TValue(DateTime.UtcNow, price));
}
Assert.Equal(1.0, cfb.Last.Value);
}
[Fact]
public void IsNew_Consistency()
{
var cfb = new Cfb();
var gbm = new GBM();
var bars = gbm.Fetch(100, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
var data = new List<TValue>();
for (int i = 0; i < bars.Count; i++)
{
data.Add(new TValue(bars.Close.Times[i], bars.Close.Values[i]));
}
// Feed first 99
for (int i = 0; i < 99; i++)
{
cfb.Update(data[i]);
}
// Update with 100th point (isNew=true)
cfb.Update(data[99], true);
// Update with modified 100th point (isNew=false)
var modified = new TValue(data[99].Time, data[99].Value + 1.0);
var val2 = cfb.Update(modified, false);
// Create new instance and feed up to modified
var cfb2 = new Cfb();
for (int i = 0; i < 99; i++)
{
cfb2.Update(data[i]);
}
var val3 = cfb2.Update(modified, true);
Assert.Equal(val3.Value, val2.Value);
}
[Fact]
public void IterativeCorrections_RestoreToOriginalState()
{
var cfb = new Cfb();
var gbm = new GBM();
var bars = gbm.Fetch(100, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
for (int i = 0; i < 50; i++)
{
cfb.Update(new TValue(bars.Close.Times[i], bars.Close.Values[i]));
}
var originalValue = cfb.Last;
for (int m = 0; m < 5; m++)
{
var modified = new TValue(bars.Close.Times[49], bars.Close.Values[49] + m);
cfb.Update(modified, isNew: false);
}
var restored = cfb.Update(new TValue(bars.Close.Times[49], bars.Close.Values[49]), isNew: false);
Assert.Equal(originalValue.Value, restored.Value, 9);
}
[Fact]
public void NaN_Input_UsesLastValidValue()
{
var cfb = new Cfb();
var gbm = new GBM();
var bars = gbm.Fetch(50, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
for (int i = 0; i < 30; i++)
{
cfb.Update(new TValue(bars.Close.Times[i], bars.Close.Values[i]));
}
var result = cfb.Update(new TValue(DateTime.UtcNow, double.NaN));
Assert.True(double.IsFinite(result.Value));
}
[Fact]
public void Infinity_Input_UsesLastValidValue()
{
var cfb = new Cfb();
var gbm = new GBM();
var bars = gbm.Fetch(50, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
for (int i = 0; i < 30; i++)
{
cfb.Update(new TValue(bars.Close.Times[i], bars.Close.Values[i]));
}
var result = cfb.Update(new TValue(DateTime.UtcNow, double.PositiveInfinity));
Assert.True(double.IsFinite(result.Value));
}
[Fact]
public void AllModes_ProduceSameResult()
{
var gbm = new GBM(seed: 123);
var bars = gbm.Fetch(200, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
// 1. Batch Mode
var batchResult = Cfb.Batch(bars.Close);
double expected = batchResult.Last.Value;
// 2. Span Mode
var spanOutput = new double[bars.Count];
Cfb.Batch(bars.Close.Values.ToArray(), spanOutput);
double spanResult = spanOutput[^1];
// 3. Streaming Mode
var streamCfb = new Cfb();
for (int i = 0; i < bars.Count; i++)
{
streamCfb.Update(new TValue(bars.Close.Times[i], bars.Close.Values[i]));
}
double streamResult = streamCfb.Last.Value;
Assert.Equal(expected, spanResult, 9);
Assert.Equal(expected, streamResult, 9);
}
[Fact]
public void StaticBatch_Matches_Streaming()
{
var gbm = new GBM();
var bars = gbm.Fetch(200, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
var series = bars.Close;
var cfb = new Cfb();
var streamingResults = new List<double>();
for (int i = 0; i < bars.Count; i++)
{
streamingResults.Add(cfb.Update(new TValue(series.Times[i], series.Values[i])).Value);
}
var staticResults = Cfb.Batch(series);
Assert.Equal(streamingResults.Count, staticResults.Count);
for (int i = 0; i < streamingResults.Count; i++)
{
Assert.Equal(streamingResults[i], staticResults.Values[i]);
}
}
[Fact]
public void SpanBatch_Matches_Streaming()
{
var gbm = new GBM();
var bars = gbm.Fetch(200, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
double[] values = bars.Close.Values.ToArray();
var cfb = new Cfb();
var streamingResults = new List<double>();
for (int i = 0; i < bars.Count; i++)
{
streamingResults.Add(cfb.Update(new TValue(bars.Close.Times[i], bars.Close.Values[i])).Value);
}
double[] spanResults = new double[bars.Count];
Cfb.Batch(values, spanResults);
for (int i = 0; i < streamingResults.Count; i++)
{
Assert.Equal(streamingResults[i], spanResults[i]);
}
}
[Fact]
public void Reset_Works()
{
var cfb = new Cfb();
var gbm = new GBM();
var bars = gbm.Fetch(100, DateTime.UtcNow.Ticks, TimeSpan.FromMinutes(1));
for (int i = 0; i < bars.Count; i++)
{
cfb.Update(new TValue(bars.Close.Times[i], bars.Close.Values[i]));
}
Assert.True(cfb.Last.Value >= 1.0);
cfb.Reset();
Assert.Equal(0, cfb.Last.Value);
Assert.Equal(0, cfb.Last.Time);
// Feed again
for (int i = 0; i < bars.Count; i++)
{
cfb.Update(new TValue(bars.Close.Times[i], bars.Close.Values[i]));
}
Assert.True(cfb.Last.Value >= 1.0);
}
[Fact]
public void Chainability_Works()
{
var cfb = new Cfb();
var cfb2 = new Cfb(cfb);
for (int i = 0; i < 100; i++)
{
cfb.Update(new TValue(DateTime.UtcNow, i));
}
Assert.True(cfb2.Last.Value > 0);
}
}