Add test infrastructure code for dendrite unit/integ tests (#2331)

* Add test infrastructure code for dendrite unit/integ tests

Start re-enabling some syncapi storage tests in the process.

* Linting

* Add postgres service to unit tests

* dendrite not syncv3

* Skip test which doesn't work

* Linting

* Add `jetstream.PrepareForTests`

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

test/user.go

@@ -0,0 +1,36 @@
+// Copyright 2022 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package test
+
+import (
+	"fmt"
+	"sync/atomic"
+)
+
+var (
+	userIDCounter = int64(0)
+)
+
+type User struct {
+	ID string
+}
+
+func NewUser() *User {
+	counter := atomic.AddInt64(&userIDCounter, 1)
+	u := &User{
+		ID: fmt.Sprintf("@%d:localhost", counter),
+	}
+	return u
+}