test: Add e2e tests for replication (#15671)

Signed-off-by: Noble Mittal <noblemittal@outlook.com>
Signed-off-by: Manan Gupta <manan@planetscale.com>
Co-authored-by: Manan Gupta <manan@planetscale.com>

go/test/endtoend/utils/mysql.go

@@ -54,7 +54,7 @@ func NewMySQL(cluster *cluster.LocalProcessCluster, dbName string, schemaSQL ...
 		}
 		sqls = append(sqls, split...)
 	}
-	mysqlParam, _, closer, error := NewMySQLWithMysqld(cluster.GetAndReservePort(), cluster.Hostname, dbName, sqls...)
+	mysqlParam, _, _, closer, error := NewMySQLWithMysqld(cluster.GetAndReservePort(), cluster.Hostname, dbName, sqls...)
 	return mysqlParam, closer, error
 }
 
@@ -75,24 +75,24 @@ func CreateMysqldAndMycnf(tabletUID uint32, mysqlSocket string, mysqlPort int) (
 	return mysqlctl.NewMysqld(&cfg), mycnf, nil
 }
 
-func NewMySQLWithMysqld(port int, hostname, dbName string, schemaSQL ...string) (mysql.ConnParams, *mysqlctl.Mysqld, func(), error) {
+func NewMySQLWithMysqld(port int, hostname, dbName string, schemaSQL ...string) (mysql.ConnParams, *mysqlctl.Mysqld, *mysqlctl.Mycnf, func(), error) {
 	mysqlDir, err := createMySQLDir()
 	if err != nil {
-		return mysql.ConnParams{}, nil, nil, err
+		return mysql.ConnParams{}, nil, nil, nil, err
 	}
 	initMySQLFile, err := createInitSQLFile(mysqlDir, dbName)
 	if err != nil {
-		return mysql.ConnParams{}, nil, nil, err
+		return mysql.ConnParams{}, nil, nil, nil, err
 	}
 
 	mysqlPort := port
 	mysqld, mycnf, err := CreateMysqldAndMycnf(0, "", mysqlPort)
 	if err != nil {
-		return mysql.ConnParams{}, nil, nil, err
+		return mysql.ConnParams{}, nil, nil, nil, err
 	}
 	err = initMysqld(mysqld, mycnf, initMySQLFile)
 	if err != nil {
-		return mysql.ConnParams{}, nil, nil, err
+		return mysql.ConnParams{}, nil, nil, nil, err
 	}
 
 	params := mysql.ConnParams{
@@ -104,10 +104,10 @@ func NewMySQLWithMysqld(port int, hostname, dbName string, schemaSQL ...string)
 	for _, sql := range schemaSQL {
 		err = prepareMySQLWithSchema(params, sql)
 		if err != nil {
-			return mysql.ConnParams{}, nil, nil, err
+			return mysql.ConnParams{}, nil, nil, nil, err
 		}
 	}
-	return params, mysqld, func() {
+	return params, mysqld, mycnf, func() {
 		ctx := context.Background()
 		_ = mysqld.Teardown(ctx, mycnf, true, mysqlShutdownTimeout)
 	}, nil