[Test] added Lua test coverage collector for functional tests

diff --git a/test/functional/lua/test_coverage.lua b/test/functional/lua/test_coverage.lua
new file mode 100644 (file)
index 0000000..68f2545
--- /dev/null
+++ b/test/functional/lua/test_coverage.lua
@@ -0,0 +1,46 @@
+--[[
+-- This should be the very first file executed during a test
+-- otherwise coverage will be partly missed
+--]]
+local logger = require "rspamd_logger"
+local mempool = require "rspamd_mempool"
+local loaded, luacov = pcall(require, 'luacov.runner')
+if not loaded then
+  logger.errx('luacov is not loaded, will not collect coverage')
+  return
+end
+
+luacov.init()
+
+local pool = mempool.create()
+-- we don't need the pool, we need userdata to put __gc() on it
+-- __gc() is not called for tables, that't why there is such trick
+-- so, we are free to clean memory, let's do this :)
+pool:destroy()
+
+local woker_name
+
+rspamd_config:add_on_load(function(cfg, ev_base, worker)
+  woker_name = worker:get_name()
+  local stats_path = rspamd_paths["DBDIR"] .. '/' .. woker_name .. '.luacov.stats.out'
+  local config = luacov.load_config()
+  config.statsfile = stats_path
+end)
+
+-- use global variable to prevent the object from being GC'ed too early
+__GLOBAL_COVERAGE_WATCHDOG = {pool = pool}
+
+local mt = {
+  __gc = function()
+  --[[
+  -- We could've used finish_script but in that case some coverage would be missed:
+  -- pool destructors are executed after finish_scripts (when Lua state is terminated and that's
+  -- how we can collect coverage of cove executed there
+  --]]
+    if woker_name then
+      luacov.shutdown()
+    end
+  end
+}
+
+debug.setmetatable(__GLOBAL_COVERAGE_WATCHDOG.pool, mt)