[chore] Deinterface processor and subprocessors (#1501)

* [chore] Deinterface processor and subprocessors

* expose subprocessors via function calls

* missing license header

internal/processing/stream/open_test.go

@@ -0,0 +1,41 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package stream_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+)
+
+type OpenStreamTestSuite struct {
+	StreamTestSuite
+}
+
+func (suite *OpenStreamTestSuite) TestOpenStream() {
+	account := suite.testAccounts["local_account_1"]
+
+	_, errWithCode := suite.streamProcessor.Open(context.Background(), account, "user")
+	suite.NoError(errWithCode)
+}
+
+func TestOpenStreamTestSuite(t *testing.T) {
+	suite.Run(t, &OpenStreamTestSuite{})
+}