[#75] added option to test s3 connection and send test emails

tests/mailer.go

@@ -11,18 +11,27 @@ var _ mailer.Mailer = (*TestMailer)(nil)
 
 // TestMailer is a mock `mailer.Mailer` implementation.
 type TestMailer struct {
-	TotalSend    int
-	LastHtmlBody string
+	TotalSend       int
+	LastFromAddress mail.Address
+	LastToAddress   mail.Address
+	LastHtmlSubject string
+	LastHtmlBody    string
 }
 
 // Reset clears any previously test collected data.
 func (m *TestMailer) Reset() {
-	m.LastHtmlBody = ""
 	m.TotalSend = 0
+	m.LastFromAddress = mail.Address{}
+	m.LastToAddress = mail.Address{}
+	m.LastHtmlSubject = ""
+	m.LastHtmlBody = ""
 }
 
 // Send implements `mailer.Mailer` interface.
 func (m *TestMailer) Send(fromEmail mail.Address, toEmail mail.Address, subject string, html string, attachments map[string]io.Reader) error {
+	m.LastFromAddress = fromEmail
+	m.LastToAddress = toEmail
+	m.LastHtmlSubject = subject
 	m.LastHtmlBody = html
 	m.TotalSend++
 	return nil