test: setup common stability and robustness properties tracking

lib/volume/mfi/Mfi.Quantower.Tests.cs

@@ -119,4 +119,4 @@ public class MfiIndicatorTests
         Assert.Equal(21, indicator.MinHistoryDepths);
         Assert.Equal(21, ((IWatchlistIndicator)indicator).MinHistoryDepths);
     }
-}
+}

lib/volume/mfi/Mfi.Tests.cs

@@ -409,4 +409,4 @@ public class MfiTests
 
         Assert.True(mfi.IsHot);
     }
-}
+}

lib/volume/mfi/Mfi.Validation.Tests.cs

@@ -52,7 +52,7 @@ public class MfiValidationTests
         var retCode = Functions.Mfi<double>(
             highData, lowData, closeData, volumeData,
             0..^0, taOut, out var outRange, period);
-        Assert.Equal(Core.RetCode.Success, retCode);
+        Assert.Equal(TALib.Core.RetCode.Success, retCode);
 
         (int offset, int length) = outRange.GetOffsetAndLength(taOut.Length);
         Assert.True(length > 100, $"TALib MFI produced only {length} values");
@@ -192,4 +192,4 @@ public class MfiValidationTests
 
         Assert.False(allEqual, "Different periods should produce different results");
     }
-}
+}