Tests of crack calculator were added

StructureHelperLogics/NdmCalculations/Cracking/IRebarStressCalculatorInputData.cs

@@ -0,0 +1,31 @@
+using LoaderCalculator.Data.Ndms;
+using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Cracking
+{
+    /// <summary>
+    /// Input data for rebar stress calculator
+    /// </summary>
+    public interface IRebarStressCalculatorInputData : IInputData
+    {
+        /// <summary>
+        /// Force tuple for calculting
+        /// </summary>
+        ForceTuple ForceTuple { get; set; }
+        /// <summary>
+        /// Collection of ndms of cross-section (as usual without concrete tensile strength)
+        /// </summary>
+        IEnumerable<INdm> NdmCollection { get; set; }
+        /// <summary>
+        /// Rebar which stress and strain will be obtained for 
+        /// </summary>
+        IRebarPrimitive RebarPrimitive { get; set; }
+    }
+}