feat: Add Blackman Window Moving Average (BLMA) implementation and documentation

lib/trends/blma/Blma.Quantower.Tests.cs

@@ -0,0 +1,85 @@
+using Xunit;
+using TradingPlatform.BusinessLayer;
+using QuanTAlib;
+
+namespace QuanTAlib.Tests;
+
+public class BlmaIndicatorTests
+{
+    [Fact]
+    public void BlmaIndicator_Constructor_SetsDefaults()
+    {
+        var indicator = new BlmaIndicator();
+
+        Assert.Equal(14, indicator.Period);
+        Assert.True(indicator.ShowColdValues);
+        Assert.Equal("BLMA - Blackman Window Moving Average", indicator.Name);
+        Assert.False(indicator.SeparateWindow);
+        Assert.Equal(SourceType.Close, indicator.Source);
+    }
+
+    [Fact]
+    public void BlmaIndicator_MinHistoryDepths_EqualsPeriod()
+    {
+        var indicator = new BlmaIndicator { Period = 20 };
+
+        Assert.Equal(20, indicator.MinHistoryDepths);
+        IWatchlistIndicator watchlistIndicator = indicator;
+        Assert.Equal(20, watchlistIndicator.MinHistoryDepths);
+    }
+
+    [Fact]
+    public void BlmaIndicator_ShortName_IncludesParameters()
+    {
+        var indicator = new BlmaIndicator { Period = 20 };
+        indicator.Initialize();
+
+        Assert.Contains("BLMA", indicator.ShortName);
+        Assert.Contains("20", indicator.ShortName);
+    }
+
+    [Fact]
+    public void BlmaIndicator_SourceCodeLink_IsValid()
+    {
+        var indicator = new BlmaIndicator();
+
+        Assert.Contains("github.com", indicator.SourceCodeLink);
+        Assert.Contains("Blma.Quantower.cs", indicator.SourceCodeLink);
+    }
+
+    [Fact]
+    public void BlmaIndicator_Initialize_CreatesInternalBlma()
+    {
+        var indicator = new BlmaIndicator { Period = 14 };
+
+        // Initialize should not throw
+        indicator.Initialize();
+
+        // After init, line series should exist
+        Assert.Single(indicator.LinesSeries);
+    }
+
+    [Fact]
+    public void BlmaIndicator_ProcessUpdate_HistoricalBar_ComputesValue()
+    {
+        var indicator = new BlmaIndicator { Period = 5 };
+        indicator.Initialize();
+
+        // Add historical data
+        var now = DateTime.UtcNow;
+        // Need enough bars for Period
+        for (int i = 0; i < 20; i++)
+        {
+            indicator.HistoricalData.AddBar(now.AddMinutes(i), 100 + i, 110 + i, 90 + i, 105 + i);
+
+            // Process update for each bar to simulate history loading
+            var args = new UpdateArgs(UpdateReason.HistoricalBar);
+            indicator.ProcessUpdate(args);
+        }
+
+        // Line series should have a value
+        double blma = indicator.LinesSeries[0].GetValue(0);
+
+        Assert.True(double.IsFinite(blma));
+    }
+}