Add fakes for db interface (#46885)

pkg/services/sqlstore/db/dbtest/dbtest.go

@@ -0,0 +1,23 @@
+package dbtest
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/services/sqlstore"
+)
+
+type FakeDB struct {
+	ExpectedError error
+}
+
+func NewFakeDB() *FakeDB {
+	return &FakeDB{}
+}
+
+func (f *FakeDB) WithTransactionalDbSession(ctx context.Context, callback sqlstore.DBTransactionFunc) error {
+	return f.ExpectedError
+}
+
+func (f *FakeDB) WithDbSession(ctx context.Context, callback sqlstore.DBTransactionFunc) error {
+	return f.ExpectedError
+}