add unit test files for C#

modules/swagger-codegen/src/main/resources/csharp/api_test.mustache

@@ -0,0 +1,61 @@
+using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Reflection;
+using RestSharp;
+using NUnit.Framework;
+
+using {{packageName}}.Client;
+using {{packageName}}.Api;
+{{#hasImport}}using {{packageName}}.Model;
+{{/hasImport}}
+
+namespace {{packageName}}.Test
+{
+    [TestFixture]
+    public class {{classname}}Tests
+    {
+        private {{classname}} instance;
+
+        /// <summary>
+        /// Setup before each unit test
+        /// </summary>
+        [SetUp]
+        public void Init()
+        {
+           instance = new {{classname}}();
+        }
+
+        /// <summary>
+        /// Clean up after each unit test
+        /// </summary>
+        [TearDown]
+        public void Cleanup()
+        {
+
+        }
+
+        /// <summary>
+        /// Test an instance of {{classname}}
+        /// </summary>
+        [Test]
+        public void {{operationId}}InstanceTest()
+        {
+            Assert.IsInstanceOf<{{classname}}> (instance, "instance is a {{classname}}");
+        }
+
+        {{#operations}}{{#operation}}
+        /// <summary>
+        /// Test {{operationId}}
+        /// </summary>
+        [Test]
+        public void {{operationId}}Test()
+        {
+            // TODO: add unit test for the method '{{operationId}}'
+        }
+        {{/operation}}{{/operations}}
+    }
+
+}

modules/swagger-codegen/src/main/resources/csharp/model_test.mustache

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+using NUnit.Framework;
+
+using System;
+using System.Linq;
+using System.IO;
+using System.Collections.Generic;
+using {{packageName}}.Api;
+using {{packageName}}.Model;
+using {{packageName}}.Client;
+using System.Reflection;
+
+{{#models}}
+{{#model}}
+namespace {{packageName}}.Test
+{
+    [TestFixture]
+    public class {{classname}}Tests
+    {
+        private {{classname}} instance;
+
+        /// <summary>
+        /// Setup before each test
+        /// </summary>
+        [SetUp]
+        public void Init()
+        {
+            instance = new {{classname}}();
+        }
+    
+        /// <summary>
+        /// Clean up after each test
+        /// </summary>
+        [TearDown]
+        public void Cleanup()
+        {
+
+        }   
+
+        /// <summary>
+        /// Test an instance of {{classname}}
+        /// </summary>
+        [Test]
+        public void {{classname}}InstanceTest()
+        {
+            Assert.IsInstanceOf<{{classname}}> (instance, "instance is a {{classname}}");
+        }
+
+        {{#vars}}
+        /// <summary>
+        /// Test the property '{{name}}' 
+        /// </summary>
+        [Test]
+        public void {{name}}Test()
+        {
+            // TODO: unit test for the property '{{name}}' 
+        }
+        {{/vars}}
+
+    }
+
+}
+{{/model}}
+{{/models}}