Revert "dialect: add alwaysfail driver (#1053)"

This reverts commit b3e118d301.

dialect/dialect.go

@@ -140,25 +140,3 @@ func (d *DebugTx) Rollback() error {
 	d.log(d.ctx, fmt.Sprintf("Tx(%s): rollbacked", d.id))
 	return d.Tx.Rollback()
 }
-
-type errDriver struct {
-	Driver
-	err error
-}
-
-func (d errDriver) Exec(context.Context, string, interface{}, interface{}) error {
-	return d.err
-}
-
-func (d errDriver) Query(context.Context, string, interface{}, interface{}) error {
-	return d.err
-}
-
-func (d errDriver) Tx(context.Context) (Tx, error) {
-	return nil, d.err
-}
-
-// AlwaysFail returns a driver that always returns the given error.
-func AlwaysFail(driver Driver, err error) Driver {
-	return errDriver{driver, err}
-}

dialect/dialect_test.go

@@ -1,30 +0,0 @@
-// Copyright 2019-present Facebook Inc. All rights reserved.
-// This source code is licensed under the Apache 2.0 license found
-// in the LICENSE file in the root directory of this source tree.
-
-package dialect_test
-
-import (
-	"context"
-	"fmt"
-	"testing"
-
-	"github.com/facebook/ent/dialect"
-
-	"github.com/stretchr/testify/require"
-)
-
-type driver struct {
-	dialect.Driver
-}
-
-func (driver) Dialect() string { return "driver" }
-
-func TestAlwaysFail(t *testing.T) {
-	d := driver{}
-	fd := dialect.AlwaysFail(d, fmt.Errorf("error"))
-	_, err := fd.Tx(context.Background())
-	require.Error(t, err)
-	require.EqualError(t, err, "error")
-	require.Equal(t, d.Dialect(), fd.Dialect())
-}