Add a test case for LuaJIT bug gh-3196

test/luajit-tap/gh.test.lua

+#!/usr/bin/env tarantool
+
+-- Miscellaneous test for LuaJIT bugs
+tap = require('tap')
+
+test = tap.test("gh")
+test:plan(2)
+--
+-- gh-3196: incorrect string length if Lua hash returns 0
+--
+h = "\x1F\x93\xE2\x1C\xCA\xDE\x28\x08\x26\x01\xED\x0A\x2F\xE4\x21\x02\x97\x77\xD9\x3E"
+test:is(h:len(), 20)
+
+h = "\x0F\x93\xE2\x1C\xCA\xDE\x28\x08\x26\x01\xED\x0A\x2F\xE4\x21\x02\x97\x77\xD9\x3E"
+test:is(h:len(), 20)
+
+test:check()

test/luajit-tap/suite.ini

+[default]
+core = app
+description = Luajit tests
+is_parallel = False