Fix failing tests in generators

Author: antoineatstariongroup

SysML2.NET.CodeGenerator/Generators/EcoreHandleBarsGenerators/EcoreHandleBarsGenerator.cs

@@ -24,6 +24,7 @@ namespace SysML2.NET.CodeGenerator.Generators.HandleBarsGenerators
     using System.Threading.Tasks;
 
     using ECoreNetto;
+    
     using SysML2.NET.CodeGenerator.Generators;
 
     /// <summary>
@@ -33,11 +34,12 @@ namespace SysML2.NET.CodeGenerator.Generators.HandleBarsGenerators
     public abstract class EcoreHandleBarsGenerator : HandleBarsGenerator
     {
         /// <summary>
-        /// Initializes a new instance of the <see cref="HandleBarsGenerator"/> class/
+        /// Gets an optional subfolder location path to locate templates
         /// </summary>
-        protected EcoreHandleBarsGenerator()
+        /// <returns>An optional subfolder name</returns>
+        protected override string GetOptionalSubfolderTemplateLocation()
         {
-            this.TemplateFolderPath = Path.Combine(this.TemplateFolderPath, "Ecore");
+            return "ecore";
         }
 
         /// <summary>

SysML2.NET.CodeGenerator/Generators/Generator.cs

@@ -39,9 +39,33 @@ public abstract class Generator
         /// Initializes a new instance of the <see cref="Generator"/> class.
         /// </summary>
         protected Generator()
+        {
+            this.AssignTemplateFolderPath();
+        }
+
+        /// <summary>
+        /// Assigns the value of the <see cref="TemplateFolderPath"/>
+        /// </summary>
+        private void AssignTemplateFolderPath()
         {
             var assemblyFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
             this.TemplateFolderPath = Path.Combine(assemblyFolder, "Templates");
+
+            var subfolderLocation = this.GetOptionalSubfolderTemplateLocation();
+
+            if (!string.IsNullOrWhiteSpace(subfolderLocation))
+            {
+                this.TemplateFolderPath = Path.Combine(this.TemplateFolderPath, subfolderLocation);
+            }
+        }
+
+        /// <summary>
+        /// Gets an optional subfolder location path to locate templates
+        /// </summary>
+        /// <returns>An optional subfolder name</returns>
+        protected virtual string GetOptionalSubfolderTemplateLocation()
+        {
+            return null;
         }
 
         /// <summary>