Implement the GET verb for FindById operation for MsSql

DataGateway.Service.Tests/MsSqlTests/MsSqlGraphQLQueryTests.cs

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+using System.Text.Json;
+using System.Threading.Tasks;
+using Azure.DataGateway.Service.Controllers;
+using Azure.DataGateway.Services;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Azure.DataGateway.Service.Tests.MsSql
+{
+    /// <summary>
+    /// Test GraphQL Queries validating proper resolver/engine operation.
+    /// </summary>
+    [TestClass, TestCategory(TestCategory.MSSQL)]
+    public class MsSqlGraphQLQueryTests : MsSqlTestBase
+    {
+        #region Test Fixture Setup
+        private static GraphQLService _graphQLService;
+        private static GraphQLController _graphQLController;
+        private static readonly string _integrationTableName = "character";
+
+        /// <summary>
+        /// Sets up test fixture for class, only to be run once per test run, as defined by
+        /// MSTest decorator.
+        /// </summary>
+        /// <param name="context"></param>
+        [ClassInitialize]
+        public static void InitializeTestFixture(TestContext context)
+        {
+            InitializeTestFixture(context, _integrationTableName);
+
+            // Setup GraphQL Components
+            //
+            _graphQLService = new GraphQLService(_queryEngine, mutationEngine: null, _metadataStoreProvider);
+            _graphQLController = new GraphQLController(_graphQLService);
+        }
+
+        /// <summary>
+        /// Cleans up querying table used for Tests in this class. Only to be run once at
+        /// conclusion of test run, as defined by MSTest decorator.
+        /// </summary>
+        [ClassCleanup]
+        public static void CleanupTestFixture()
+        {
+            CleanupTestFixture(_integrationTableName);
+        }
+
+        #endregion
+
+        #region Tests
+        /// <summary>
+        /// Gets result of quering singular object
+        /// </summary>
+        /// <returns></returns>
+        [TestMethod]
+        public async Task SingleResultQuery()
+        {
+            string graphQLQueryName = "characterById";
+            string graphQLQuery = "{\"query\":\"{\\n characterById(id:2){\\n name\\n primaryFunction\\n}\\n}\\n\"}";
+            string msSqlQuery = $"SELECT name, primaryFunction FROM { _integrationTableName } WHERE id = 2 FOR JSON PATH, INCLUDE_NULL_VALUES, WITHOUT_ARRAY_WRAPPER";
+
+            string actual = await GetGraphQLResultAsync(graphQLQuery, graphQLQueryName);
+            string expected = await GetDatabaseResultAsync(msSqlQuery);
+
+            Assert.AreEqual(actual, expected);
+        }
+
+        /// <summary>
+        /// Gets array of results for querying more than one item.
+        /// </summary>
+        /// <returns></returns>
+        [TestMethod]
+        public async Task MultipleResultQuery()
+        {
+            string graphQLQueryName = "characterList";
+            string graphQLQuery = "{\"query\":\"{\\n  characterList {\\n    name\\n    primaryFunction\\n  }\\n}\\n\"}";
+            string msSqlQuery = $"SELECT name, primaryFunction FROM character FOR JSON PATH, INCLUDE_NULL_VALUES";
+
+            string actual = await GetGraphQLResultAsync(graphQLQuery, graphQLQueryName);
+            string expected = await GetDatabaseResultAsync(msSqlQuery);
+
+            Assert.AreEqual(actual, expected);
+        }
+
+        #endregion
+
+        #region Query Test Helper Functions
+        /// <summary>
+        /// Sends graphQL query through graphQL service, consisting of gql engine processing (resolvers, object serialization)
+        /// returning JSON formatted result from 'data' property. 
+        /// </summary>
+        /// <param name="graphQLQuery"></param>
+        /// <param name="graphQLQueryName"></param>
+        /// <returns>string in JSON format</returns>
+        public static async Task<string> GetGraphQLResultAsync(string graphQLQuery, string graphQLQueryName)
+        {
+            _graphQLController.ControllerContext.HttpContext = MsSqlTestBase.GetHttpContextWithBody(graphQLQuery);
+            JsonDocument graphQLResult = await _graphQLController.PostAsync();
+            JsonElement graphQLResultData = graphQLResult.RootElement.GetProperty("data").GetProperty(graphQLQueryName);
+            return graphQLResultData.ToString();
+        }
+
+        #endregion
+    }
+}