Implement Mail service.

service/mail/testable.go

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package mail
+
+// TestMessage is the message struct which will be returned from SentMessages.
+//
+// It augments the Message struct by also including the derived MIMEType for any
+// attachments.
+type TestMessage struct {
+        Message
+
+        // MIMETypes is guaranteed to be the same length as the attachments in the
+        // Message, and will be populated with the derived MIME types for the
+        // attachments.
+        MIMETypes []string
+}
+
+// Copy duplicates this TestMessage.
+func (t *TestMessage) Copy() *TestMessage {
+        ret := &TestMessage{Message: *t.Message.Copy()}
+        if len(t.MIMETypes) > 0 {
+                ret.MIMETypes = make([]string, len(t.MIMETypes))
+                copy(ret.MIMETypes, t.MIMETypes)
+        }
+        return ret
+}
+
+// Testable is the interface for mail service implementations which are able
+// to be tested (like impl/memory).
+type Testable interface {
+        // Sets the list of admin emails. By default, testing implementations should
+        // use ["admin@example.com"].
+        SetAdminEmails(emails ...string)
+
+        // SentMessages returns a copy of all messages which were successfully sent
+        // via the mail API.
+        SentMessages() []*TestMessage
+
+        // Reset clears the SentMessages queue.
+        Reset()
+}