Allow tests to ignore value of exception number.

Azure Database for MySQL doesn't consistently populate this value.

Author: bgrainger

tests/SideBySide/ConnectSync.cs

@@ -63,7 +63,8 @@ public void ConnectBadDatabase()
 					// https://bugs.mysql.com/bug.php?id=78426
 					Assert.NotNull(ex);
 #else
-					Assert.Equal((int) MySqlErrorCode.UnknownDatabase, ex.Number);
+					if (AppConfig.SupportedFeatures.HasFlag(ServerFeatures.ErrorCodes) || ex.Number != 0)
+						Assert.Equal((int) MySqlErrorCode.UnknownDatabase, ex.Number);
 #endif
 				}
 				Assert.Equal(ConnectionState.Closed, connection.State);
@@ -88,7 +89,8 @@ public void ConnectBadPassword()
 					// https://bugs.mysql.com/bug.php?id=73610
 					Assert.NotNull(ex);
 #else
-					Assert.Equal((int) MySqlErrorCode.AccessDenied, ex.Number);
+					if (AppConfig.SupportedFeatures.HasFlag(ServerFeatures.ErrorCodes) || ex.Number != 0)
+						Assert.Equal((int) MySqlErrorCode.AccessDenied, ex.Number);
 #endif
 				}
 				Assert.Equal(ConnectionState.Closed, connection.State);

tests/SideBySide/ServerFeatures.cs

@@ -14,5 +14,6 @@ public enum ServerFeatures
 		CachingSha2Password = 32,
 		SessionTrack = 64,
 		Timeout = 128,
+		ErrorCodes = 256,
 	}
 }