Module:UnitTests

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The following documentation is located at Module:UnitTests/documentation.
Useful links: subpage list • links • transclusions • testcases • sandbox

This module facilitates creating unit tests for Lua modules.

Put the following at Module:name/testcases: 

local tests = require('Module:UnitTests')

function tests:test_example()
	--]
end

return tests

Then put the following on Module:name/testcases/documentation: 

{{#invoke:name/testcases|run_tests}}

Tests should be written as Lua methods whose names start with test. The self object contains the following methods, which may be called from the method:

preprocess_equals(text, expected, options)
Will check whether expanding templates in text results in expected.
preprocess_equals_many(prefix, suffix, cases, options)
preprocess_equals_preprocess(text1, text2, options)
Will check whether expanding templates in text1 and text2 results in the same string.
preprocess_equals_preprocess_many(prefix1, suffix1, prefix2, suffix2, cases, options)
equals(name, actual, expected, options)
Will check whether two primitive values are equal. name will be used as the row header. When the value is a table, equals_deep should be used.
equals_deep(name, actual, expected, options)
Will check whether two values, which may be tables, are equal. name will be used as the row header.
header(string)
Create a heading in the table, which appears after the last-called checking function.
iterate
Requires an array as its first argument. Iterates over the items in the array. If the item in the array is an array, a function will be called on the contents of the array. If the item is a string, a heading is created using self:header().
Two variations:
  • iterate(array, function_name)
Here, function_name is a string, the name of a method in the self object. For instance, self:iterate({ { "a", "b" }, { "c", "d" } }, "check") calls self:check("a", "b") and self:check("c", "d"). This self:check() method must be defined separately.
  • iterate(array, func)
Same as above, except the second argument is a function. For instance, self:iterate( { { "a", "b" }, { "c", "d" } }, check) will call check(self, "a", "b") and check(self, "c", "d").

options should be given in a table or omitted. Currently, these are the options supported:

  • nowiki: Causes both the expected and the actual values to be wrapped in <nowiki> tags when rendering the results table.
  • comment: A comment to be added to the rightmost column of table.
  • display: A function to yield the form actually displayed in the table. This is used in testcases for pronunciation modules to make the IPA transcriptions display with the correct fonts.
  • show_difference: If this is set to true (or any truthy value besides a function), failing tests will have the first offending character highlighted in red (that is, the first character in the "actual" string that is different from the corresponding character in the "expected" string). If this is a function, the character will be highlighted using the function. (Currently only available in the equals checking function. The highlighter will highlight combining characters together with the characters they are placed on.)

See also

Use Module:transliteration module testcases to quickly create testcases for a transliteration module. It uses this module. At the moment, it only supports romanization and a single set of examples. 


local m_table = require("Module:table")

local UnitTester = {}

local concat = table.concat
local deep_equals = m_table.deepEquals
local explode_utf8 = require("Module:string utilities").explode_utf8
local html = mw.html
local insert = table.insert
local is_combining = require("Module:Unicode data").is_combining
local nowiki = require("Module:string/nowiki")
local shallowcopy = m_table.shallowcopy
local sort = table.sort
local sorted_pairs = m_table.sortedPairs
local ustring = mw.ustring

local tick, cross =
	']',
	']'

local function first_difference(s1, s2)
	if not (type(s1) == "string" and type(s2) == "string") then
		return "N/A"
	elseif s1 == s2 then
		return ""
	end
	
	s1 = explode_utf8(s1)
	s2 = explode_utf8(s2)
	
	local i = 0
	repeat
		i = i + 1
	until s1 ~= s2
	
	return i
end

local function highlight(str)
	if ustring.find(str, "%s") then
		return '<span style="background-color: pink;">' ..
			string.gsub(str, " ", "&nbsp;") .. '</span>'
	else
		return '<span style="color: red;">' ..
			str .. '</span>'
	end
end

local function find_noncombining(str, i, incr)
	local char = ustring.sub(str, i, i)
	while char ~= '' and is_combining(char) do
		i = i + incr
		char = ustring.sub(str, i, i)
	end
	return i
end

-- Highlight character where a difference was found. Start highlight at first
-- non-combining character before the position. End it after the first non-
-- combining characters after the position. Can specify a custom highlighing
-- function.
local function highlight_difference(actual, expected, differs_at, func)
	if type(differs_at) ~= "number" or not (actual and expected) then
		return actual
	end
	differs_at = find_noncombining(expected, differs_at, -1)
	local i = find_noncombining(actual, differs_at, -1)
	local j = find_noncombining(actual, differs_at + 1, 1)
	j = j - 1
	return ustring.sub(actual, 1, i - 1) ..
		(type(func) == "function" and func or highlight)(ustring.sub(actual, i, j)) ..
		ustring.sub(actual, j + 1, -1)
end

local function val_to_str(v)
	if type(v) == 'string' then
		v = string.gsub(v, '\n', '\\n')
		if string.find(string.gsub(v, '', ''), '^"+$') then
			return "'" .. v .. "'"
		end
		return '"' .. string.gsub(v, '"', '\\"' ) .. '"'
	elseif type(v) == 'table' then
		local result, done = {}, {}
		for k, val in ipairs(v) do
			insert(result, val_to_str(val))
			done = true
		end
		for k, val in sorted_pairs(v) do
			if not done then
				if (type(k) ~= "string") or not string.find(k, '^*$') then
					k = ''
				end
				insert(result, k .. '=' .. val_to_str(val))
			end
		end
		return "{" .. concat(result, ", ") .. "}"
	else
		return tostring(v)
	end
end

local function deep_compare(t1, t2, ignore_mt)
	return deep_equals(t1, t2, not ignore_mt)
end

local function get_differing_keys(t1, t2)
	local ty1, ty2 = type(t1), type(t2)
	if ty1 ~= ty2 then return nil
	elseif ty1 ~= 'table' then return nil end
	
	local mt = getmetatable(t1)
	if not ignore_mt and mt and mt.__eq then return nil end
	
	local keys = {}
	
	for k1, v1 in pairs(t1) do
		local v2 = t2
		if v2 == nil or not deep_compare(v1, v2) then insert(keys, k1) end
	end
	for k2, v2 in pairs(t2) do
		local v1 = t1
		if v1 == nil or not deep_compare(v1, v2) then insert(keys, k2) end
	end

	return keys
end

local function extract_keys(table, keys)
	if not keys then return table end
	local new_table = {}
	for _, key in ipairs(keys) do
		new_table = table
	end
	return new_table
end

-- Return the header for the result table along with the number of columns in the table.
function UnitTester:new_result_table()
	local header_row = html.create("tr")
		:tag("th")
			:attr("class", "unit-tests-img-corner")
			:css("cursor", "pointer")
			:attr("title", "Only failed tests")
			:done()
	
	local columns = shallowcopy(self.name_columns)
	insert(columns, "Expected")
	insert(columns, "Actual")
	insert(columns, differs_at)
	
	if self.differs_at then
		insert(columns, "Differs at")
	end
	
	if self.comments then
		insert(columns, "Comments")
	end
	
	for _, cell in ipairs(columns) do
		header_row = header_row:tag("th")
			:wikitext(cell)
			:done()
	end
	
	self.columns = #columns + 1
	
	return html.create("table")
		:attr("class", "unit-tests wikitable")
		:node(header_row)
end

function UnitTester:display_difference(success, name, actual, expected, options)
	local differs_at = self.differs_at and first_difference(expected, actual)
	local comment = self.comments and (options and options.comment or "")
	
	expected = expected == nil and "(nil)" or tostring(expected)
	actual   = actual == nil and "(nil)" or tostring(actual)
	
	if self.nowiki or options and options.nowiki then
		expected = nowiki(expected)
		actual = nowiki(actual)
	end
	
	if options and type(options.display) == "function" then
		expected = options.display(expected)
		actual = options.display(actual)
	end
	
	local cells
	if type(name) == "table" then
		cells = shallowcopy(name)
		insert(cells, expected)
		insert(cells, actual)
		insert(cells, differs_at)
	else
		cells = {
			name,
			expected,
			actual,
			differs_at
		}
	end
	insert(cells, comment) -- In case differs_at is nil.
	
	local row = html.create("tr")
	
	if success then
		row = row:attr("class", "unit-test-pass")
		insert(cells, 1, tick)
	else
		row = row:attr("class", "unit-test-fail")
		insert(cells, 1, cross)
		self.num_failures = self.num_failures + 1
	end
	
	for _, cell in ipairs(cells) do
		row = row:tag("td")
			:wikitext(cell)
			:done()
	end
	
	self.result_table = self.result_table:node(row)
	
	self.total_tests = self.total_tests + 1
end

function UnitTester:equals(name, actual, expected, options)
	success = actual == expected
	if options and options.show_difference then
		local difference = first_difference(expected, actual)
		if type(difference) == "number" then
			actual = highlight_difference(actual, expected, difference,
				type(options.show_difference) == "function" and options.show_difference)
		end
	end
	self:display_difference(success, name, actual, expected, options)
end

function UnitTester:preprocess_equals(text, expected, options)
	local actual = self.frame:preprocess(text)
	self:equals(nowiki(text), actual, expected, options)
end

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

function UnitTester:preprocess_equals_preprocess(text1, text2, options)
	local expected = self.frame:preprocess(text2)
	self:preprocess_equals(text1, expected, options)
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 .. suffix1, prefix2 .. (case and case or case) .. suffix2, options)
	end
end

function UnitTester:equals_deep(name, actual, expected, options)
	local actual_str, expected_str
	local success = deep_compare(actual, expected)
	if success then
		if options and options.show_table_difference then
			actual_str = ''
			expected_str = ''
		end
	else
		if options and options.show_table_difference then
			local keys = get_differing_keys(actual, expected)
			actual_str = val_to_str(extract_keys(actual, keys))
			expected_str = val_to_str(extract_keys(expected, keys))
		end
	end
	if (not options) or not options.show_table_difference then
		actual_str = val_to_str(actual)
		expected_str = val_to_str(expected)
	end

	self:display_difference(success, name, actual_str, expected_str, options)
end

function UnitTester:iterate(examples, func)
	require 'libraryUtil'.checkType('iterate', 1, examples, 'table')
	if type(func) == 'string' then
		func = self
	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:header(example)
		else
			error(('bad example #%d (expected table or string, got %s)')
				:format(i, type(example)), 2)
		end
	end
end

function UnitTester:header(text)
	local prefix, maintext = text:match('^#(h+):(.*)$')
	if not prefix then
		maintext = text
	end
	
	local header = html.create("th")
		:attr("colspan", self.columns)
	
	if prefix == "h1" then
		header = header:css("text-align", "center")
			:css("font-size", "150%")
	else
		header = header:css("text-align", "left")
	end
	
	header = header:wikitext(maintext)
	
	self.result_table = self.result_table:tag("tr")
		:node(header)
		:done()
end

function UnitTester:run(frame)
	self.num_failures = 0
	
	local output = {}

	local iparams = {
		 = {type = "boolean"},
		 = {type = "boolean"},
		 = {type = "boolean"},
		 = {type = "boolean"},
		 = {list = true, default = "Text"},
	}

	local iargs = require("Module:parameters").process(frame.args, iparams)

	self.frame = frame
	self.nowiki = iargs.nowiki
	self.differs_at = iargs.differs_at
	self.comments = iargs.comments
	self.summarize = iargs.summarize
	self.name_columns = iargs.name_column
	self.total_tests = 0

	-- Sort results into alphabetical order.
	local self_sorted = {}
	for key in pairs(self) do
		if key:find('^test') then
			insert(self_sorted, key)
		end
	end
	sort(self_sorted)
	
	-- Add results to the results table.
	for _, key in ipairs(self_sorted) do
		self.result_table = self:new_result_table()
			:tag("caption")
				:css("text-align", "left")
				:css("font-weight", "bold")
				:wikitext(key .. ":")
				:done()
		local traceback = "(no traceback)"
		local success, mesg = xpcall(function()
			return self(self)	
		end, function(mesg)
			traceback = debug.traceback("", 2)
			return mesg
		end)
		if not success then
			self.result_table = self.result_table:tag("tr")
				:tag("td")
					:attr("colspan", self.columns)
					:css("text-align", "left")
					:tag("strong")
						:attr("class", "error")
						:wikitext("Script error during testing: " .. nowiki(mesg))
						:done()
					:wikitext(frame:extensionTag("pre", traceback))
					:allDone()
			self.num_failures = self.num_failures + 1
		end
		insert(output, tostring(self.result_table))
	end

	local refresh_link = tostring(mw.uri.fullUrl(mw.title.getCurrentTitle().fullText, 'action=purge&forcelinkupdate=1'))

	local failure_cat = ']'
	if mw.title.getCurrentTitle().text:find("/documentation$") then
		failure_cat = ''
	end
	
	local num_successes = self.total_tests - self.num_failures
	
	if self.summarize then
		if self.num_failures == 0 then
			return '<strong class="success">' .. self.total_tests .. '/' .. self.total_tests .. ' tests passed</strong>'
		else
			return '<strong class="error">' .. num_successes .. '/' .. self.total_tests .. ' tests passed</strong>'
		end
	else
		return (self.num_failures == 0 and '<strong class="success">All tests passed.</strong>' or 
				'<strong class="error">' .. self.num_failures .. ' of ' .. self.total_tests .. ' test' .. (self.total_tests == 1 and '' or 's' ) .. ' failed.</strong>' .. failure_cat) ..
			" <span class='plainlinks unit-tests-refresh'></span>\n\n" ..
			concat(output, "\n\n")
	end
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
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