Module:UnitTests

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UnitTests provides a unit test facility that can be used by other scripts using require. See Wikipedia:Lua#Unit_testing for details. Following is a sample from Module:Example/testcases: 

-- Unit tests for [[Module:Example]]. Click talk page to run tests.
local p = require('Module:UnitTests')

function p:test_hello()
    self:preprocess_equals('Hello World!', 'Hello World!')
end

return p

The talk page Module talk:Example/testcases executes it with {{#invoke: Example/testcases | run_tests}}. Test methods like test_hello above must begin with "test".

Methods

run_tests

  • run_tests: Runs all tests. Normally used on talk page of unit tests.
    {{#invoke:Example/testcases|run_tests}}
  • If differs_at=1 is specified, a column will be added showing the first character position where the expected and actual results differ.
    {{#invoke:Example/testcases|run_tests|differs_at=1}}
  • If {{{1}}} is specified, the header will show the columns "Test", "Live", "Sandbox", "Expected"

preprocess_equals

  • preprocess_equals(text, expected, options): Gives a piece of wikitext to preprocess and an expected resulting value. Scripts and templates can be invoked in the same manner they would be in a page.
    self:preprocess_equals('{{#invoke:Example | hello}}', 'Hello, world!',{nowiki=1})

preprocess_equals_many

  • preprocess_equals_many(prefix, suffix, cases, options): Performs a series of preprocess_equals() calls on a set of given pairs. Automatically adds the given prefix and suffix to each text.
    self:preprocess_equals_many('{{#invoke:Example | hello_to |', '}}', {
        {'John', 'Hello, John!'},
        {'Jane', 'Hello, Jane!'},
    },{nowiki=1})

preprocess_equals_preprocess

  • preprocess_equals_preprocess(text, expected, options): Gives two pieces of wikitext to preprocess and determines if they produce the same value. Useful for comparing scripts to existing templates.
    self:preprocess_equals_preprocess('{{#invoke:Example| hello}}', '{{Hello}}',{nowiki=1})

preprocess_equals_preprocess_many

  • preprocess_equals_preprocess_many(prefix1, suffix1, prefix2, suffix2, cases, options): Performs a series of preprocess_equals_preprocess() calls on a set of given pairs. The prefix/suffix supplied for both arguments is added automatically. If in any case the second part is not specified, the first part will be used.
    self:preprocess_equals_preprocess_many('{{#invoke:ConvertNumeric | numeral_to_english|', '}}', '{{spellnum', '}}', {
        {'2'}, -- equivalent to {'2','2'},
        {'-2', '-2.0'},
    },{nowiki=1})

preprocess_equals_sandbox_many

  • preprocess_equals_sandbox_many(module, function, cases, options): Performs a series of preprocess_equals_compare() calls on a set of given pairs. The test compares the live version of the module vs the /sandbox version and vs an expected result.
    self:preprocess_equals_sandbox_many('{{#invoke:Example', 'hello_to', {
        {'John', 'Hello, John!'},
        {'Jane', 'Hello, Jane!'},
    },{nowiki=1})

equals

  • equals(name, actual, expected, options): Gives a computed value and the expected value, and checks if they are equal according to the == operator. Useful for testing modules that are designed to be used by other modules rather than using #invoke.
    self:equals('Simple addition', 2 + 2, 4,{nowiki=1})

equals_deep

  • equals_deep(name, actual, expected, options): Like equals, but handles tables by doing a deep comparison. Neither value should contain circular references, as they are not handled by the current implementation and may result in an infinite loop.
    self:equals_deep('Table comparison', createRange(1,3), {1,2,3},{nowiki=1})

See also

-- 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! !! Text !! Expected !! Actual"
local result_table_live_sandbox_header = "{|class=\"wikitable\"\n|+ %s\n! !! Test !! Live !! Sandbox  !! Expected"

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)										-- <actual> and <expected> will be rendered in <result_table>
	local expected = frame:preprocess(text2)
	local actual_for_comp = actual												-- copy of <actual> that may be modified to have same templatestyles stripmarker as <expected> for comparison
	local highlight																-- boolean true to highlight mismatched renderings in Actual column of result

	if options and true == options.templatestyles then							-- when module rendering has templatestyles strip markers, use ID from expected to prevent false test fail
		local pattern = '(\127[^\127]*UNIQ%-%-templatestyles%-)(%x+)(%-QINU[^\127]*\127)'	-- templatestyle stripmarker pattern
		local _, expected_stripmarker_id = expected:match(pattern)				-- get templatestyles strip marker id from expected (the reference); ignore first capture in pattern

		if expected_stripmarker_id then
			actual_for_comp = actual_for_comp:gsub(pattern, '%1' .. expected_stripmarker_id .. '%3')	-- replace actual id with expected id; ignore second capture in pattern
		end
	end

	-- option to ignore any strip marker when comparing actual to expected
	if options and true == options.stripmarker then
		local pattern = '(\127[^\127]*UNIQ%-%-%l+%-)(%x+)(%-QINU[^\127]*\127)'
		local _, expected_stripmarker_id = expected:match(pattern)
		if expected_stripmarker_id then
			actual_for_comp = actual_for_comp:gsub(pattern, '%1' .. expected_stripmarker_id .. '%3')
			expected = expected:gsub(pattern, '%1' .. expected_stripmarker_id .. '%3')
		end
	end

	if actual_for_comp == expected then											-- are the renderings the same
		result_table:insert('| ', tick)
	else
		result_table:insert('| ', cross)										-- nope; mark as failure
		num_failures = num_failures + 1											-- tally
		highlight=true															-- and highlight the results table Actual column cell (so the failed test is more obvious)
	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),													-- the tested template nowikied
		' \n| ',
		maybe_nowiki(expected),													-- the expected version
		highlight and ' \n|style="background: #fc0;"| ' or ' \n| ',				-- highlighted if test fail; not else
		maybe_nowiki(actual), differs_at,										-- the actual rendering using its own template styles if that is an option
		"\n|-\n")
end

function UnitTester:preprocess_equals_compare(live, sandbox, expected, options)
	local live_text = frame:preprocess(live)
	local sandbox_text = frame:preprocess(sandbox)

	local highlight_live = false
	local highlight_sandbox = false
	if live_text == expected and sandbox_text == expected then
		result_table:insert('| ', tick)
	else
		result_table:insert('| ', cross)
		num_failures = num_failures + 1

		if live_text ~= expected then
			highlight_live = true
		end

		if sandbox_text ~= expected then
			highlight_sandbox = true
		end
	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, live_text) or first_difference(expected, sandbox_text)) or ''
    result_table:insert(
			' \n| ',
			mw.text.nowiki(live),
			highlight_live and ' \n|style="background: #fc0;"| ' or ' \n| ',
			maybe_nowiki(live_text),
			highlight_sandbox and ' \n|style="background: #fc0;"| ' or ' \n| ',
			maybe_nowiki(sandbox_text),
			' \n| ',
			maybe_nowiki(expected),
			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:preprocess_equals_sandbox_many(module, function_name, cases, options)
    for _, case in ipairs(cases) do
		local live = module .. "|" .. function_name .. "|" .. case[1] .. "}}"
		local sandbox = module .. "/sandbox|" .. function_name .. "|" .. case[1] .. "}}"
        self:preprocess_equals_compare(live, sandbox, case[2], 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
	if frame.args['live_sandbox'] then
		table_header = result_table_live_sandbox_header
	end

	self.columns = 4
    if self.differs_at then
        table_header = table_header .. ' !! Differs at'
        self.columns = self.columns + 1
    end

    -- Sort results into alphabetical order.
    local self_sorted = {}
    for key, _ 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 _, value in ipairs(self_sorted) do
        result_table:insert_format(table_header .. "\n|-\n", value)
        self[value](self)
        result_table:insert("|}\n")
    end

    return (num_failures == 0 and "<b style=\"color:#008000\">All tests passed.</b>" or "<b style=\"color:#800000\">" .. num_failures .. " tests failed.</b>[[Category:Failed Lua testcases using Module:UnitTests]]") .. "\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
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