[MM-12805] Remove ephemeral post after leaving a channel (#9772)

* remove ephemeral post after leaving a channel

* remove unnecessary debugging line

app/command_leave.go

@@ -51,5 +51,5 @@ func (me *LeaveProvider) DoCommand(a *App, args *model.CommandArgs, message stri
 		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
 	}
 
-	return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + model.DEFAULT_CHANNEL, Text: args.T("api.command_leave.success"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + model.DEFAULT_CHANNEL}
 }

app/command_leave_test.go

@@ -0,0 +1,86 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/mattermost/mattermost-server/model"
+)
+
+func TestLeaveProviderDoCommand(t *testing.T) {
+	th := Setup().InitBasic()
+	defer th.TearDown()
+
+	lp := LeaveProvider{}
+
+	publicChannel, _ := th.App.CreateChannel(&model.Channel{
+		DisplayName: "AA",
+		Name:        "aa" + model.NewId() + "a",
+		Type:        model.CHANNEL_OPEN,
+		TeamId:      th.BasicTeam.Id,
+		CreatorId:   th.BasicUser.Id,
+	}, false)
+
+	privateChannel, _ := th.App.CreateChannel(&model.Channel{
+		DisplayName: "BB",
+		Name:        "aa" + model.NewId() + "a",
+		Type:        model.CHANNEL_OPEN,
+		TeamId:      th.BasicTeam.Id,
+		CreatorId:   th.BasicUser.Id,
+	}, false)
+
+	th.App.AddUserToTeam(th.BasicTeam.Id, th.BasicUser.Id, th.BasicUser.Id)
+	th.App.AddUserToChannel(th.BasicUser, publicChannel)
+	th.App.AddUserToChannel(th.BasicUser, privateChannel)
+
+	args := &model.CommandArgs{
+		T: func(s string, args ...interface{}) string { return s },
+	}
+
+	// Should error when no Channel ID in args
+	actual := lp.DoCommand(th.App, args, "")
+	assert.Equal(t, "api.command_leave.fail.app_error", actual.Text)
+	assert.Equal(t, model.COMMAND_RESPONSE_TYPE_EPHEMERAL, actual.ResponseType)
+
+	// Should error when no Team ID in args
+	args.ChannelId = publicChannel.Id
+	actual = lp.DoCommand(th.App, args, "")
+	assert.Equal(t, "api.command_leave.fail.app_error", actual.Text)
+	assert.Equal(t, model.COMMAND_RESPONSE_TYPE_EPHEMERAL, actual.ResponseType)
+
+	// Leave a public channel
+	siteURL := "http://localhost:8065"
+	args.TeamId = th.BasicTeam.Id
+	args.SiteURL = siteURL
+	actual = lp.DoCommand(th.App, args, "")
+	assert.Equal(t, "", actual.Text)
+	assert.Equal(t, siteURL+"/"+th.BasicTeam.Name+"/channels/"+model.DEFAULT_CHANNEL, actual.GotoLocation)
+	assert.Equal(t, "", actual.ResponseType)
+
+	time.Sleep(100 * time.Millisecond)
+
+	member, err := th.App.GetChannelMember(publicChannel.Id, th.BasicUser.Id)
+	if member == nil {
+		t.Errorf("Expected member object, got nil")
+	}
+
+	if err != nil {
+		t.Errorf("Expected nil object, got %s", err)
+	}
+
+	// Leave a private channel
+	args.ChannelId = privateChannel.Id
+	actual = lp.DoCommand(th.App, args, "")
+	assert.Equal(t, "", actual.Text)
+
+	// Should not leave a default channel
+	defaultChannel, _ := th.App.GetChannelByName(model.DEFAULT_CHANNEL, th.BasicTeam.Id, false)
+	args.ChannelId = defaultChannel.Id
+	actual = lp.DoCommand(th.App, args, "")
+	assert.Equal(t, "api.channel.leave.default.app_error", actual.Text)
+}

i18n/en.json

@@ -694,10 +694,6 @@
     "id": "api.command_leave.name",
     "translation": "leave"
   },
-  {
-    "id": "api.command_leave.success",
-    "translation": "Left the channel."
-  },
   {
     "id": "api.command_logout.desc",
     "translation": "Logout of Mattermost"