GH-10438 - Rewrite existing plugin API tests to exclusively te… (#13302)

app/plugin_api_tests/test_send_mail_plugin/main.go

@@ -0,0 +1,68 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/mattermost/mattermost-server/v5/app/plugin_api_tests"
+	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v5/plugin"
+	"github.com/mattermost/mattermost-server/v5/services/mailservice"
+)
+
+type MyPlugin struct {
+	plugin.MattermostPlugin
+	configuration plugin_api_tests.BasicConfig
+}
+
+func (p *MyPlugin) OnConfigurationChange() error {
+	if err := p.API.LoadPluginConfiguration(&p.configuration); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (p *MyPlugin) MessageWillBePosted(c *plugin.Context, post *model.Post) (*model.Post, string) {
+	to := p.configuration.BasicUserEmail
+	subject := "testing plugin api sending email"
+	body := "this is a test."
+
+	if err := p.API.SendMail(to, subject, body); err != nil {
+		return nil, err.Error()
+	}
+
+	// Check if we received the email
+	var resultsMailbox mailservice.JSONMessageHeaderInbucket
+	if errMail := mailservice.RetryInbucket(5, func() error {
+		var err error
+		resultsMailbox, err = mailservice.GetMailBox(to)
+		return err
+	}); errMail != nil {
+		return nil, errMail.Error()
+	}
+	if len(resultsMailbox) == 0 {
+		return nil, fmt.Sprintf("No mailbox results. Should be %v", len(resultsMailbox))
+	}
+	if !strings.ContainsAny(resultsMailbox[len(resultsMailbox)-1].To[0], to) {
+		return nil, "Result doesn't contain recipient"
+	}
+
+	resultsEmail, err1 := mailservice.GetMessageFromMailbox(to, resultsMailbox[len(resultsMailbox)-1].ID)
+	if err1 != nil {
+		return nil, err1.Error()
+	}
+	if resultsEmail.Subject != subject {
+		return nil, fmt.Sprintf("subject differs: %v vs %s", resultsEmail.Subject, subject)
+	}
+	if resultsEmail.Body.Text != body {
+		return nil, fmt.Sprintf("body differs: %v vs %s", resultsEmail.Body.Text, body)
+	}
+	return nil, "OK"
+}
+
+func main() {
+	plugin.ClientMain(&MyPlugin{})
+}