-- UnitTester provides unit testing for other Lua scripts. For details see .
-- For user documentation see talk page.
local UnitTester = {}  
local , 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 = :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 = :preprocess(text1) -- <actual> and <expected> will be rendered in <result_table>
local expected = :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|| ' 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 = :preprocess(live)
local sandbox_text = :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|| ' or ' \n| ',
maybe_nowiki(live_text),
highlight_sandbox and ' \n|| ' 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