local p = require('Module:UnitTests')

--[[--------------------------< T E S T _ P A T T E R N S _ G E T >--------------------------------------------

Build a table of test patterns where each entry in the table is a table with two members:
	{"<code>", "<cat name according to Module:Lang>"}

]]

local function test_patterns_get()
	local cat_from_tag = require('Module:Lang')._category_from_tag				-- use Module:Lang to create the 'expected results'
	local iana_data = mw.loadData('Module:Language/data/iana languages').active	-- use the iana data
	local code_mask = '^[a-h]%l%l'												-- used to limit number of tests
	local tpats = {}															-- collect test patterns here
	for code in pairs(iana_data) do											-- list of names not needed here
		local pattern = {}														-- here we assemble the test pattern for <code>
		if code:find(code_mask) then											-- if code within limits (three-character codes)
			table.insert(pattern, code)										-- add it to the pattern
			table.insert(pattern, cat_from_tag ({code}))						-- call module:lang and add the 'expected results' for code to pattern
			table.insert(tpats, pattern)										-- accumulate in list of patterns
		end
	end

	local function comp(a, b)													-- local function used by table.sort()
		return a[1] < b[1]														-- ascending sort by code
	end
	
	table.sort (tpats, comp)													-- make the list pretty
	return tpats																-- and done
end

--[[--------------------------< T E S T _ C A T E G O R Y _ F R O M _ T A G >----------------------------------
]]

function p:test_category_from_tag_iso_639_3_1()
	local test_patterns = test_patterns_get()
	self:preprocess_equals_preprocess_many('((#invoke:Lang/sandbox|category_from_tag|', '))', '', '', test_patterns, {nowiki=1})
end

return p