channeldb/db_test: move migration helper back to meta_test

channeldb/db_test.go

@@ -5,8 +5,6 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
-
-	"github.com/go-errors/errors"
 )
 
 func TestOpenWithCreate(t *testing.T) {
@@ -35,56 +33,3 @@ func TestOpenWithCreate(t *testing.T) {
 		t.Fatalf("channeldb failed to create data directory")
 	}
 }
-
-// applyMigration is a helper test function that encapsulates the general steps
-// which are needed to properly check the result of applying migration function.
-func applyMigration(t *testing.T, beforeMigration, afterMigration func(d *DB),
-	migrationFunc migration, shouldFail bool) {
-
-	cdb, cleanUp, err := makeTestDB()
-	defer cleanUp()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// beforeMigration usually used for populating the database
-	// with test data.
-	beforeMigration(cdb)
-
-	// Create test meta info with zero database version and put it on disk.
-	// Than creating the version list pretending that new version was added.
-	meta := &Meta{DbVersionNumber: 0}
-	if err := cdb.PutMeta(meta); err != nil {
-		t.Fatalf("unable to store meta data: %v", err)
-	}
-
-	versions := []version{
-		{
-			number:    0,
-			migration: nil,
-		},
-		{
-			number:    1,
-			migration: migrationFunc,
-		},
-	}
-
-	defer func() {
-		if r := recover(); r != nil {
-			err = errors.New(r)
-		}
-
-		if err == nil && shouldFail {
-			t.Fatal("error wasn't received on migration stage")
-		} else if err != nil && !shouldFail {
-			t.Fatal("error was received on migration stage")
-		}
-
-		// afterMigration usually used for checking the database state and
-		// throwing the error if something went wrong.
-		afterMigration(cdb)
-	}()
-
-	// Sync with the latest version - applying migration function.
-	err = cdb.syncVersions(versions)
-}