Add test for call_16 net.box connect opt

test/box/net.box.result

@@ -1009,6 +1009,30 @@ c.space.test.index.covering.parts
 box.space.test:drop()
 ---
 ...
+-- CALL vs CALL_16 in connect options
+function scalar42() return 42 end
+---
+...
+c = net.connect(box.cfg.listen)
+---
+...
+c:call('scalar42')
+---
+- 42
+...
+c:close()
+---
+...
+c = net.connect(box.cfg.listen, {call_16 = true})
+---
+...
+c:call('scalar42')
+---
+- - [42]
+...
+c:close()
+---
+...
 box.schema.user.revoke('guest', 'read,write,execute', 'universe')
 ---
 ...

test/box/net.box.test.lua

@@ -403,6 +403,15 @@ c.space.test.index.covering.parts
 
 box.space.test:drop()
 
+-- CALL vs CALL_16 in connect options
+function scalar42() return 42 end
+c = net.connect(box.cfg.listen)
+c:call('scalar42')
+c:close()
+c = net.connect(box.cfg.listen, {call_16 = true})
+c:call('scalar42')
+c:close()
+
 box.schema.user.revoke('guest', 'read,write,execute', 'universe')
 
 -- Tarantool < 1.7.1 compatibility (gh-1533)