[MM-22133] Allow exporting and importing archived channels (#23724)

server/channels/app/import_functions_test.go

@@ -704,6 +704,21 @@ func TestImportImportChannel(t *testing.T) {
 	assert.Equal(t, *data.Header, channel.Header)
 	assert.Equal(t, *data.Purpose, channel.Purpose)
 	assert.Equal(t, scheme2.Id, *channel.SchemeId)
+
+	// Do a valid archived channel.
+	now := model.GetMillis()
+	data.Name = ptrStr("archivedchannel")
+	data.DisplayName = ptrStr("Archived Channel")
+	data.Type = &chanOpen
+	data.Header = ptrStr("Archived Channel Header")
+	data.Purpose = ptrStr("Archived Channel Purpose")
+	data.Scheme = &scheme1.Name
+	data.DeletedAt = &now
+	err = th.App.importChannel(th.Context, &data, false)
+	require.Nil(t, err, "Expected success in apply mode")
+	aChan, err := th.App.GetChannelByName(th.Context, *data.Name, team.Id, true)
+	require.Nil(t, err, "Failed to get channel from database.")
+	assert.Equal(t, *data.Name, aChan.Name)
 }
 
 func TestImportImportUser(t *testing.T) {