Add tests for MySQL bug 88660.

Author: bgrainger

docs/content/tutorials/migrating-from-connector-net.md

@@ -122,6 +122,7 @@ The following bugs in Connector/NET are fixed by switching to MySqlConnector.
 * [#88058](https://bugs.mysql.com/bug.php?id=88058): `decimal(n, 0)` has wrong `NumericPrecision`
 * [#88124](https://bugs.mysql.com/bug.php?id=88124): CommandTimeout isn’t reset when calling Read/NextResult
 * [#88611](https://bugs.mysql.com/bug.php?id=88611): `MySqlCommand` can be executed even if it has "wrong" transaction
+* [#88660](https://bugs.mysql.com/bug.php?id=88660): `MySqlClientFactory.Instance.CreateDataAdapter()` and `CreateCommandBuilder` return `null`
 * [#89085](https://bugs.mysql.com/bug.php?id=89085): `MySqlConnection.Database` not updated after `USE database;`
 * [#89159](https://bugs.mysql.com/bug.php?id=89159): `MySqlDataReader` cannot outlive `MySqlCommand`
 * [#89335](https://bugs.mysql.com/bug.php?id=89335): `MySqlCommandBuilder.DeriveParameters` fails for `JSON` type

tests/SideBySide/ClientFactoryTests.cs

@@ -0,0 +1,47 @@
+using MySql.Data.MySqlClient;
+using Xunit;
+
+namespace SideBySide
+{
+	public class ClientFactoryTests
+	{
+		[Fact]
+		public void CreateCommand()
+		{
+			Assert.IsType<MySqlCommand>(MySqlClientFactory.Instance.CreateCommand());
+		}
+
+		[Fact]
+		public void CreateConnection()
+		{
+			Assert.IsType<MySqlConnection>(MySqlClientFactory.Instance.CreateConnection());
+		}
+
+		[Fact]
+		public void CreateConnectionStringBuilder()
+		{
+			Assert.IsType<MySqlConnectionStringBuilder>(MySqlClientFactory.Instance.CreateConnectionStringBuilder());
+		}
+
+
+		[Fact]
+		public void CreateParameter()
+		{
+			Assert.IsType<MySqlParameter>(MySqlClientFactory.Instance.CreateParameter());
+		}
+
+#if !NETCOREAPP1_1_2
+		[SkippableFact(Baseline = "https://bugs.mysql.com/bug.php?id=88660")]
+		public void CreateCommandBuilder()
+		{
+			Assert.IsType<MySqlCommandBuilder>(MySqlClientFactory.Instance.CreateCommandBuilder());
+		}
+
+		[SkippableFact(Baseline = "https://bugs.mysql.com/bug.php?id=88660")]
+		public void CreateDataAdapter()
+		{
+			Assert.IsType<MySqlDataAdapter>(MySqlClientFactory.Instance.CreateDataAdapter());
+		}
+#endif
+	}
+}