Module:UnitTests

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-- UnitTester provides unit testing for other Lua scripts. For details see [[Wikipedia:Lua#Unit_testing]].
-- For user documentation see talk page.
local UnitTester = {}

local frame, tick, cross
local result_table_header = "{|class=\"wikitable\"\n|+ %s\n! !! Κείμενο !! Αναμενόμενο αποτέλεσμα !! Πραγματικό αποτέλεσμα"

local result_table = { n = 0 }
local result_table_mt = {
	insert = function (self, ...)
		local n = self.n
		for i = 1, select('#', ...) do
			local val = select(i, ...)
			if val ~= nil then
				n = n + 1
				self[n] = val
			end
		end
		self.n = n
	end,
	insert_format = function (self, ...)
		self:insert(string.format(...))
	end,
	concat = table.concat
}
result_table_mt.__index = result_table_mt
setmetatable(result_table, result_table_mt)

local num_failures = 0

function first_difference(s1, s2)
	if s1 == s2 then return '' end
	local max = math.min(#s1, #s2)
	for i = 1, max do
		if s1:sub(i,i) ~= s2:sub(i,i) then return i end
	end
	return max + 1
end

local function return_varargs(...)
	return ...
end

function UnitTester:preprocess_equals(text, expected, options)
	local actual = frame:preprocess(text)
	if actual == expected then
		result_table:insert('| ', tick)
	else
		result_table:insert('| ', cross)
		num_failures = num_failures + 1
	end
	local maybe_nowiki = (options and options.nowiki) and mw.text.nowiki or return_varargs
	local differs_at = self.differs_at and (' \n| ' .. first_difference(expected, actual)) or ''
	result_table:insert(' \n| ', mw.text.nowiki(text), ' \n| ',
		maybe_nowiki(expected), ' \n| ', maybe_nowiki(actual), differs_at,
		"\n|-\n")
end

function UnitTester:preprocess_equals_many(prefix, suffix, cases, options)
	for _, case in ipairs(cases) do
		self:preprocess_equals(prefix .. case[1] .. suffix, case[2], options)
	end
end

function UnitTester:preprocess_equals_preprocess(text1, text2, options)
	local actual = frame:preprocess(text1)
	local expected = frame:preprocess(text2)
	if actual == expected then
		result_table:insert('| ', tick)
	else
		result_table:insert('| ', cross)
		num_failures = num_failures + 1
	end
	local maybe_nowiki = (options and options.nowiki) and mw.text.nowiki or return_varargs
	local differs_at = self.differs_at and (' \n| ' .. first_difference(expected, actual)) or ''
	result_table:insert(' \n| ', mw.text.nowiki(text1), ' \n| ',
		maybe_nowiki(expected), ' \n| ', maybe_nowiki(actual), differs_at,
		"\n|-\n")
end

function UnitTester:preprocess_equals_preprocess_many(prefix1, suffix1, prefix2, suffix2, cases, options)
	for _, case in ipairs(cases) do
		self:preprocess_equals_preprocess(prefix1 .. case[1] .. suffix1, prefix2 .. (case[2] and case[2] or case[1]) .. suffix2, options)
	end
end

function UnitTester:equals(name, actual, expected, options)
	if actual == expected then
		result_table:insert('| ', tick)
	else
		result_table:insert('| ', cross)
		num_failures = num_failures + 1
	end
	local maybe_nowiki = (options and options.nowiki) and mw.text.nowiki or return_varargs
	local differs_at = self.differs_at and (' \n| ' .. first_difference(expected, actual)) or ''
	local display = options and options.display or function(x) return x end
	result_table:insert(' \n| ', name, ' \n| ',
		maybe_nowiki(tostring(display(expected))), ' \n| ',
		maybe_nowiki(tostring(display(actual))), differs_at, "\n|-\n")
end

local function deep_compare(t1, t2, ignore_mt)
	local ty1 = type(t1)
	local ty2 = type(t2)
	if ty1 ~= ty2 then return false end
	if ty1 ~= 'table' and ty2 ~= 'table' then return t1 == t2 end

	local mt = getmetatable(t1)
	if not ignore_mt and mt and mt.__eq then return t1 == t2 end

	for k1, v1 in pairs(t1) do
		local v2 = t2[k1]
		if v2 == nil or not deep_compare(v1, v2) then return false end
	end
	for k2, v2 in pairs(t2) do
		local v1 = t1[k2]
		if v1 == nil or not deep_compare(v1, v2) then return false end
	end

	return true
end

function val_to_str(v)
	if type(v) == 'string' then
		v = mw.ustring.gsub(v, '\n', '\\n')
		if mw.ustring.match(mw.ustring.gsub(v, '[^\'"]', ''), '^"+$') then
			return "'" .. v .. "'"
		end
		return '"' .. mw.ustring.gsub(v, '"', '\\"' ) .. '"'
	else
		return type(v) == 'table' and table_to_str(v) or tostring(v)
	end
end

function table_key_to_str(k)
	if type(k) == 'string' and mw.ustring.match(k, '^[_%a][_%a%d]*$') then
		return k
	else
		return '[' .. val_to_str(k) .. ']'
	end
end

function table_to_str(tbl)
	local result, done = {}, {}
	for k, v in ipairs(tbl) do
		table.insert(result, val_to_str(v))
	done[k] = true
	end
    for k, v in pairs(tbl) do
        if not done[k] then
            table.insert(result, table_key_to_str(k) .. '=' .. val_to_str(v))
        end
    end
    return '{' .. table.concat(result, ',') .. '}'
end

function UnitTester:equals_deep(name, actual, expected, options)
    if deep_compare(actual, expected) then
        result_table:insert('| ', tick)
    else
        result_table:insert('| ', cross)
        num_failures = num_failures + 1
    end
    local maybe_nowiki = (options and options.nowiki) and mw.text.nowiki or return_varargs
    local actual_str = val_to_str(actual)
    local expected_str = val_to_str(expected)
    local differs_at = self.differs_at and (' \n| ' .. first_difference(expected_str, actual_str)) or ''
    result_table:insert(' \n| ', name, ' \n| ', maybe_nowiki(expected_str),
    	' \n| ', maybe_nowiki(actual_str), differs_at, "\n|-\n")
end

function UnitTester:iterate(examples, func)
	require 'libraryUtil'.checkType('iterate', 1, examples, 'table')
	if type(func) == 'string' then
		func = self[func]
	elseif type(func) ~= 'function' then
		error(("bad argument #2 to 'iterate' (expected function or string, got %s)")
			:format(type(func)), 2)
	end
	
	for i, example in ipairs(examples) do
		if type(example) == 'table' then
			func(self, unpack(example))
		elseif type(example) == 'string' then
			self:heading(example)
		else
			error(('bad example #%d (expected table, got %s)')
				:format(i, type(example)), 2)
		end
	end
end

function UnitTester:heading(text)
	result_table:insert_format(' ! colspan="%u" style="text-align: left" | %s \n |- \n ',
		self.columns, text)
end

function UnitTester:run(frame_arg)
	frame = frame_arg
	self.frame = frame
	self.differs_at = frame.args['differs_at']
	tick = frame:preprocess('{{Tick}}')
	cross = frame:preprocess('{{Cross}}')

	local table_header = result_table_header
	self.columns = 4
	if self.differs_at then
		table_header = table_header .. ' !! Διαφορές'
		self.columns = self.columns + 1
	end

	-- Sort results into alphabetical order.
	local self_sorted = {}
	for key,value in pairs(self) do
		if key:find('^test') then
			table.insert(self_sorted, key)
		end
	end
	table.sort(self_sorted)
	-- Add results to the results table.
	for i,value in ipairs(self_sorted) do
		result_table:insert_format(table_header .. "\n|-\n", value)
		self[value](self)
		result_table:insert("|}\n\n")
	end
	
	return (num_failures == 0 and "<b style=\"color:#008000\">Επιτυχυμένες δοκιμές.</b>" or "<b style=\"color:#800000\">'''" .. num_failures .. " αποτυχημένες δοκιμές.</b>") .. "\n\n" .. frame:preprocess(result_table:concat())
end

function UnitTester:new()
	local o = {}
	setmetatable(o, self)
	self.__index = self
	return o
end

local p = UnitTester:new()
function p.run_tests(frame) return p:run(frame) end
return p