Implement Mail service.

service/mail/testable.go

Index: service/mail/testable.go
diff --git a/service/mail/testable.go b/service/mail/testable.go
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+// 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 {
+	if t == nil {
+		return nil
+	}
+	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()
+}