Add lua tests for config file parsing

Bare-bones for now, more tests needed.

test/test_cnf.lua

@@ -0,0 +1,49 @@
+
+local configtests = {
+ { test = "OPTIONS=color",  -- config string to parse
+   result = { },  -- errors, result of parsing the config string
+   extra = function() return nh.get_config("color") == "true" end  -- optional, function that returns boolean, and false means the test failed.
+   },
+ { test = "OPTIONS=!color",
+   result = { },
+   extra = function() return nh.get_config("color") == "false" end
+   },
+ { test = "OPTIONS=!color\nOPTIONS=color",
+   result = { { line = 2, error = "boolean option specified multiple times: color" } }
+   },
+};
+
+
+function testtable(t1, t2)
+   if type(t1) ~= type(t2) then return false end
+
+   for k1, v1 in pairs(t1) do
+      if type(v1) == "table" and type(t2[k1]) == "table" then
+         if not testtable(v1, t2[k1]) then return false end
+      else
+         if v1 ~= t2[k1] then return false end
+      end
+   end
+
+   return true
+end
+
+
+
+for k, v in pairs(configtests) do
+   local cnf = configtests[k].test;
+   local err = configtests[k].result;
+   nh.parse_config(cnf);
+   local res = nh.get_config_errors();
+
+   if not testtable(err, res) then
+      error("Config: Results don't match");
+   end
+
+   if (type(configtests[k].extra) == "function") then
+      if configtests[k].extra() == "false" then
+         error("Config: Failed extra test.");
+      end
+   end
+
+end