TT#6226 fix avp:all()

* on real environment sr.pv.get(t.id_all) returns a string not
  a list
* add tests/use_cases.lua

Change-Id: I22e50faa3423f2069a8deb6be44e33af166cb72b

ngcp/avp.lua

@@ -29,6 +29,7 @@ local NGCPAvp_MT = {
     function NGCPAvp:new(id)
         local t = {
             id = "$avp(s:" .. id .. ")",
+            id_indx = "$(avp(s:" .. id .. ")[%d])",
             id_all = "$(avp(s:" .. id .. ")[*])",
         }
         NGCPAvp_MT.__call = function(s, value)
@@ -47,7 +48,18 @@ local NGCPAvp_MT = {
             end
         end
         function t.all()
-            return sr.pv.get(t.id_all)
+            local val
+            local indx = 0
+            local res = {}
+
+            val = sr.pv.get(string.format(t.id_indx, indx))
+            if not val then return nil end
+            while val do
+                table.insert(res, val)
+                indx = indx + 1
+                val = sr.pv.get(string.format(t.id_indx, indx))
+            end
+            return res
         end
         NGCPAvp_MT.__tostring = function(s)
             local value = sr.pv.get(s.id)

tests/use_cases.lua

@@ -0,0 +1,48 @@
+--
+-- Copyright 2013-2016 SipWise Team <development@sipwise.com>
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This package is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program. If not, see <http://www.gnu.org/licenses/>.
+-- .
+-- On Debian systems, the complete text of the GNU General
+-- Public License version 3 can be found in "/usr/share/common-licenses/GPL-3".
+--
+require('luaunit')
+local NGCPXAvp = require 'ngcp.xavp'
+local NGCPAvp = require 'ngcp.avp'
+
+local srMock = require 'mocks.sr'
+sr = srMock:new()
+
+-- luacheck: ignore TestUseCases
+TestUseCases = {}
+
+function TestUseCases:tearDown()
+    sr.pv.vars = {}
+end
+
+function TestUseCases:test_copy_avp()
+	local avp = NGCPAvp:new("tmp")
+	local xavp = NGCPXAvp:new('callee', 'real_prefs')
+	local vals = {1, 2, "3", 4}
+	local okvals = {4, "3", 2, 1}
+
+	for i=1,#vals do
+		avp(vals[i])
+	end
+	assertItemsEquals(avp:all(), okvals)
+	xavp:clean('cfu')
+	assertItemsEquals(xavp:all('cfu'), nil)
+	xavp('cfu', avp:all())
+	assertItemsEquals(xavp:all('cfu'), okvals)
+end