Добавил тест для прямоугольника

StructureHelperLogics/NdmCalculations/Entities/INdmPrimitive.cs

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+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; }
+    }
+}

StructureHelperLogics/NdmCalculations/Entities/NdmPrimitive.cs

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+using StructureHelperLogics.Data.Shapes;
+using StructureHelperLogics.NdmCalculations.Materials;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.NdmCalculations.Entities
+{
+    public class NdmPrimitive : INdmPrimitive
+    {
+        public ICenter Center { get; set; }
+        public IShape Shape { get; set; }
+        public IPrimitiveMaterial PrimitiveMaterial { get; set; }
+        public double NdmMaxSize { get; set; }
+        public int NdmMinDivision { get; set; }
+    }
+}