Add tests for http basic authentication in python client (#16488)

* add tests for http basic auth in python client

* add new files

samples/client/echo_api/csharp-restsharp/src/Org.OpenAPITools.Test/Api/AuthApiTests.cs

@@ -0,0 +1,67 @@
+/*
+ * Echo Server API
+ *
+ * Echo Server API
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: team@openapitools.org
+ * Generated by: https://github.com/openapitools/openapi-generator.git
+ */
+
+using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Reflection;
+using RestSharp;
+using Xunit;
+
+using Org.OpenAPITools.Client;
+using Org.OpenAPITools.Api;
+
+namespace Org.OpenAPITools.Test.Api
+{
+    /// <summary>
+    ///  Class for testing AuthApi
+    /// </summary>
+    /// <remarks>
+    /// This file is automatically generated by OpenAPI Generator (https://openapi-generator.tech).
+    /// Please update the test case below to test the API endpoint.
+    /// </remarks>
+    public class AuthApiTests : IDisposable
+    {
+        private AuthApi instance;
+
+        public AuthApiTests()
+        {
+            instance = new AuthApi();
+        }
+
+        public void Dispose()
+        {
+            // Cleanup when everything is done.
+        }
+
+        /// <summary>
+        /// Test an instance of AuthApi
+        /// </summary>
+        [Fact]
+        public void InstanceTest()
+        {
+            // TODO uncomment below to test 'IsType' AuthApi
+            //Assert.IsType<AuthApi>(instance);
+        }
+
+        /// <summary>
+        /// Test TestAuthHttpBasic
+        /// </summary>
+        [Fact]
+        public void TestAuthHttpBasicTest()
+        {
+            // TODO uncomment below to test the method and replace null with proper value
+            //var response = instance.TestAuthHttpBasic();
+            //Assert.IsType<string>(response);
+        }
+    }
+}