Adding tests for GrpcMessageExtensionUtilities (#11040)

* Adding tests for GrpcMessageExtensionUtilities.ConvertFromHttpMessageToExpando

* add file header

Author: kshyju

test/WebJobs.Script.Tests/GrpcMessageExtensionUtilitiesTests.cs

@@ -0,0 +1,170 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Google.Protobuf;
+using Google.Protobuf.Collections;
+using Microsoft.Azure.WebJobs.Script.Grpc;
+using Microsoft.Azure.WebJobs.Script.Grpc.Messages;
+using Xunit;
+
+namespace Microsoft.Azure.WebJobs.Script.Tests
+{
+    public sealed class GrpcMessageExtensionUtilitiesTests
+    {
+        [Theory]
+        [InlineData(HttpStatusCode.OK)]
+        [InlineData(HttpStatusCode.BadRequest)]
+        [InlineData(HttpStatusCode.Accepted)]
+        [InlineData(HttpStatusCode.NotFound)]
+        public async Task ConvertFromHttpMessageToExpando_ShouldReturnExpandoObject_WithStringResponseAndStatusCode(HttpStatusCode httpStatusCode)
+        {
+            var responseBodyString = "Hello world";
+            var rpcHttp = await CreateRpcHttpAsync(responseBodyString, httpStatusCode);
+            rpcHttp.EnableContentNegotiation = true;
+
+            dynamic result = GrpcMessageExtensionUtilities.ConvertFromHttpMessageToExpando(rpcHttp);
+
+            AssertValidHttpResponseObject(result, "GET", httpStatusCode, responseBodyString, enableContentNegotiation: true);
+
+            var headers = result.headers as IDictionary<string, object>;
+            Assert.Empty(headers);
+
+            var cookies = (IEnumerable<object>)result.cookies;
+            Assert.Empty(cookies);
+        }
+
+        [Fact]
+        public async Task ConvertFromHttpMessageToExpando_ShouldReturnExpandoObject_WithPOCOResponse()
+        {
+            var bookPoco = new Book("Book1", "Author1", 49.99, new DateTime(2012, 1, 1), true, ["C#", "CLR"]);
+            var responseHeaders = new MapField<string, string>
+                {
+                    { "header1", "value1" },
+                    { "header2", "value2" }
+                };
+            var responseCookies = new RepeatedField<RpcHttpCookie>
+                {
+                    new RpcHttpCookie
+                    {
+                        Name = "cookie1",
+                        Value = "value1",
+                        Domain = new NullableString { Value = "microsoft.com" }
+                    }
+                };
+            var rpcHttp = await CreateRpcHttpAsync(bookPoco, headers: responseHeaders, cookies: responseCookies);
+
+            dynamic result = GrpcMessageExtensionUtilities.ConvertFromHttpMessageToExpando(rpcHttp);
+
+            AssertValidHttpResponseObject(result, "GET", HttpStatusCode.OK);
+
+            var headers = result.headers as IDictionary<string, object>;
+            Assert.Equal(2, headers.Count);
+            Assert.Equal("value1", headers["header1"]);
+            Assert.Equal("value2", headers["header2"]);
+
+            var cookies = (IEnumerable<object>)result.cookies;
+            Assert.Single(cookies);
+
+            var body = result.body;
+            Assert.NotNull(body);
+
+            if (body is byte[] bodyAsByteArray)
+            {
+                var actualBook = JsonSerializer.Deserialize<Book>(Encoding.UTF8.GetString(bodyAsByteArray));
+
+                Assert.Equal(bookPoco.Title, actualBook.Title);
+                Assert.Equal(bookPoco.Author, actualBook.Author);
+                Assert.Equal(bookPoco.Price, actualBook.Price);
+                Assert.Equal(bookPoco.PublishedDate.ToString("yyyy-MM-dd"), actualBook.PublishedDate.ToString("yyyy-MM-dd"));
+                Assert.Equal(bookPoco.IsBestSeller, actualBook.IsBestSeller);
+                Assert.Equal(bookPoco.Tags, actualBook.Tags);
+            }
+        }
+
+        [Fact]
+        public void ConvertFromHttpMessageToExpando_ShouldReturnNull_WhenInputIsNull()
+        {
+            var result = GrpcMessageExtensionUtilities.ConvertFromHttpMessageToExpando(null);
+
+            Assert.Null(result);
+        }
+
+        private static async Task<RpcHttp> CreateRpcHttpAsync<T>(T body,
+            HttpStatusCode httpStatusCode = HttpStatusCode.OK, string method = "GET",
+            MapField<string, string> headers = null, RepeatedField<RpcHttpCookie> cookies = null)
+        {
+            var response = new RpcHttp
+            {
+                Method = method,
+                Query = { },
+                StatusCode = ((int)httpStatusCode).ToString(),
+                Headers = { },
+                Cookies = { },
+                Body = await CreateResponseBodyTypedDataAsync(body)
+            };
+
+            if (headers != null)
+            {
+                foreach (var header in headers)
+                {
+                    response.Headers.Add(header.Key, header.Value);
+                }
+            }
+
+            if (cookies != null)
+            {
+                foreach (var cookie in cookies)
+                {
+                    response.Cookies.Add(cookie);
+                }
+            }
+
+            return response;
+        }
+
+        private static async Task<TypedData> CreateResponseBodyTypedDataAsync<T>(T value)
+        {
+            TypedData typedData = new();
+
+            using var memoryStream = new MemoryStream();
+            if (value is string stringValue)
+            {
+                await memoryStream.WriteAsync(Encoding.UTF8.GetBytes(stringValue));
+            }
+            else
+            {
+                await JsonSerializer.SerializeAsync(memoryStream, value, typeof(T));
+            }
+
+            memoryStream.Position = 0;
+            typedData.Bytes = await ByteString.FromStreamAsync(memoryStream);
+
+            return typedData;
+        }
+
+        private static void AssertValidHttpResponseObject(dynamic expando, string expectedMethod, HttpStatusCode expectedStatusCode, string expectedResponseBodyContent = null, bool enableContentNegotiation = false)
+        {
+            Assert.NotNull(expando);
+            Assert.Equal(expectedMethod, expando.method);
+            Assert.Equal(((int)expectedStatusCode).ToString(), expando.statusCode);
+            Assert.Equal(enableContentNegotiation, expando.enableContentNegotiation);
+
+            if (expectedResponseBodyContent is null || expando.body is not byte[] bodyAsByteArray)
+            {
+                return;
+            }
+
+            var bodyAsString = Encoding.UTF8.GetString(bodyAsByteArray);
+            Assert.Equal(expectedResponseBodyContent, bodyAsString);
+        }
+    }
+
+    internal record Book(string Title, string Author, double Price, DateTime PublishedDate, bool IsBestSeller, List<string> Tags);
+}