basic pairs construction

develop/all.lua

@@ -1,6 +1,7 @@
 require 'develop.example'
 require 'develop.untests'
 
+require 'develop.testing.pairs_tests'
 require 'develop.testing.requires_fragment_tests'
 require 'develop.testing.system_as_query_tests'
 

develop/testing/pairs_tests.lua

@@ -0,0 +1,8 @@
+local evo = require 'evolved'
+
+do
+    local p1, s1 = evo.id(2)
+    local pair1 = evo.pair(p1, s1)
+    local p2, s2 = evo.unpair(pair1)
+    assert(p1 == p2 and s1 == s2)
+end