errcheck issues fixed (#29196)

server/.golangci.yml

@@ -146,7 +146,6 @@ issues:
         channels/app/session_test.go|\
         channels/app/slack.go|\
         channels/app/slashcommands/auto_environment.go|\
-        channels/app/slashcommands/command_leave_test.go|\
         channels/app/slashcommands/command_loadtest.go|\
         channels/app/slashcommands/command_remove_test.go|\
         channels/app/slashcommands/command_test.go|\

server/channels/app/slashcommands/command_leave_test.go

@@ -39,12 +39,18 @@ func TestLeaveProviderDoCommand(t *testing.T) {
 
 	guest := th.createGuest()
 
-	th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, th.BasicUser.Id, th.BasicUser.Id)
-	th.App.AddUserToChannel(th.Context, th.BasicUser, publicChannel, false)
-	th.App.AddUserToChannel(th.Context, th.BasicUser, privateChannel, false)
-	th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, guest.Id, guest.Id)
-	th.App.AddUserToChannel(th.Context, guest, publicChannel, false)
-	th.App.AddUserToChannel(th.Context, guest, defaultChannel, false)
+	_, _, appErr := th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, th.BasicUser.Id, th.BasicUser.Id)
+	require.Nil(t, appErr)
+	_, appErr = th.App.AddUserToChannel(th.Context, th.BasicUser, publicChannel, false)
+	require.Nil(t, appErr)
+	_, appErr = th.App.AddUserToChannel(th.Context, th.BasicUser, privateChannel, false)
+	require.Nil(t, appErr)
+	_, _, appErr = th.App.AddUserToTeam(th.Context, th.BasicTeam.Id, guest.Id, guest.Id)
+	require.Nil(t, appErr)
+	_, appErr = th.App.AddUserToChannel(th.Context, guest, publicChannel, false)
+	require.Nil(t, appErr)
+	_, appErr = th.App.AddUserToChannel(th.Context, guest, defaultChannel, false)
+	require.Nil(t, appErr)
 
 	t.Run("Should error when no Channel ID in args", func(t *testing.T) {
 		args := &model.CommandArgs{