Add test of Connector/NET bug.

Author: bgrainger

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

@@ -176,6 +176,7 @@ The following bugs in Connector/NET are fixed by switching to MySqlConnector. (~
 * [#89159](https://bugs.mysql.com/bug.php?id=89159), [#97242](https://bugs.mysql.com/bug.php?id=97242): `MySqlDataReader` cannot outlive `MySqlCommand`
 * [#89335](https://bugs.mysql.com/bug.php?id=89335): `MySqlCommandBuilder.DeriveParameters` fails for `JSON` type
 * [#89639](https://bugs.mysql.com/bug.php?id=89639): `ReservedWords` schema contains incorrect data
+* [#90086](https://bugs.mysql.com/bug.php?id=90086): `MySqlDataReader` is closed by an unrelated command disposal
 * [#91123](https://bugs.mysql.com/bug.php?id=91123): Database names are case-sensitive when calling a stored procedure
 * [#91199](https://bugs.mysql.com/bug.php?id=91199): Can't insert `MySqlDateTime` values
 * ~~[#91751](https://bugs.mysql.com/bug.php?id=91751): `YEAR` column retrieved incorrectly with prepared command~~

tests/SideBySide/CommandTests.cs

@@ -279,6 +279,23 @@ public void CancelEmptyCommandIsNoop()
 			cmd.Cancel();
 		}
 
+		[SkippableFact(Baseline = "https://bugs.mysql.com/bug.php?id=90086")]
+		public void CommandsAreIndependent()
+		{
+			using var connection = new MySqlConnection(AppConfig.ConnectionString);
+			connection.Open();
+
+			using var cmd1 = connection.CreateCommand();
+			cmd1.CommandText = "SELECT 1;";
+
+			using var cmd2 = connection.CreateCommand();
+			cmd2.CommandText = "SELECT 'abc';";
+			using var reader = cmd2.ExecuteReader();
+
+			cmd1.Dispose();
+			Assert.True(reader.Read());
+		}
+
 		private static string GetIgnoreCommandTransactionConnectionString()
 		{
 #if BASELINE