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:
<syntaxhighlight lang="lua"> -- 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 </syntaxhighlight>
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
- Template:Code: Runs all tests. Normally used on talk page of unit tests.
{{#invoke:Example/testcases|run_tests}}
- If Template:Code 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}}
preprocess_equals
- Template:Code: 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.
<syntaxhighlight lang="lua">
self:preprocess_equals('Hello World!', 'Hello, world!',{nowiki=1})
</syntaxhighlight>
preprocess_equals_many
- Template:Code: Performs a series of preprocess_equals() calls on a set of given pairs. Automatically adds the given prefix and suffix to each text.
<syntaxhighlight lang="lua">
self:preprocess_equals_many('Hello, ', '!', {
{'John', 'Hello, John!'},
{'Jane', 'Hello, Jane!'},
},{nowiki=1})
</syntaxhighlight>
preprocess_equals_preprocess
- Template:Code: Gives two pieces of wikitext to preprocess and determines if they produce the same value. Useful for comparing scripts to existing templates.
<syntaxhighlight lang="lua">
self:preprocess_equals_preprocess('Hello World!', 'Template:Hello',{nowiki=1})
</syntaxhighlight>
preprocess_equals_preprocess_many
- Template:Code: 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.
<syntaxhighlight lang="lua">
self:preprocess_equals_preprocess_many('Lua error in Module:ConvertNumeric at line 569: Invalid decimal numeral.', 'Template:Spellnum', '', {
{'2'}, -- equivalent to {'2','2'},
{'-2', '-2.0'},
},{nowiki=1})
</syntaxhighlight>
equals
- Template:Code: 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.
<syntaxhighlight lang="lua">
self:equals('Simple addition', 2 + 2, 4,{nowiki=1})
</syntaxhighlight>
equals_deep
- Template:Code: 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.
<syntaxhighlight lang="lua">
self:equals_deep('Table comparison', createRange(1,3), {1,2,3},{nowiki=1})
</syntaxhighlight>
See also
- Module:ScribuntoUnit – alternative unit test module
-- 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 = { 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_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 .. ' !! Differs at'
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")
end
return (num_failures == 0 and "<b style=\"color:#008000\">All tests passed.</b>" or "<b style=\"color:#800000\">" .. num_failures .. " tests failed.</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