Добавил тест для прямоугольника

StructureHelperLogics/NdmCalculations/Entities/INdmPrimitive.cs

@@ -0,0 +1,17 @@
+using StructureHelperLogics.Data.Shapes;
+using StructureHelperLogics.NdmCalculations.Materials;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.NdmCalculations.Entities
+{
+    public interface INdmPrimitive
+    {
+        ICenter Center { get; set; }
+        IShape Shape { get; set; }
+        IPrimitiveMaterial PrimitiveMaterial {get;set;}
+        double NdmMaxSize { get; set; }
+        int NdmMinDivision { get; set; }
+    }
+}