模块: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:Bananas/tests:

-- Unit tests for [[Module:Bananas]]. Click talk page to run tests.
local p = require('Module:UnitTests')
 
function p:test_hello()
    self:preprocess_equals('{{#invoke:Bananas | hello}}', 'Hello, world!')
end
 
return p

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

Methods[编辑]

  • run_tests(differs_at): Runs all tests. If "differs_at=1" is specified, a column will be added showing the first character position where the expected and actual results differ. Normally used on talk page of unit tests.
    {{#invoke:Bananas/tests|run_tests}}
  • preprocess_equals(text, expected): 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:Bananas | hello}}', 'Hello, world!')
  • preprocess_equals_many(prefix, suffix, cases): 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:BananasArgs | add |', '}}', {
        {'2|3', '5'},
        {'-2|2', '0'},
    })
  • preprocess_equals_preprocess(text, expected): 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:Bananas | hello}}', '{{Hello}}')
  • preprocess_equals_preprocess_many(prefix, suffix, cases): 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_many('{{#invoke:Foo | spellnum |', '}}', '{{spellnum', '}}', {
        {'2'}, -- equivalent to {'2','2'},
        {'-2', '-2.0'},
    })
  • equals(name, actual, expected): Gives a computed value and the expected value, and checks if they are equal. Useful for testing modules that are designed to be used by other modules rather than using #invoke.
    self:equals('Simple addition', 2 + 2, 4)
-- [[en:Module:UnitTests]]
-- UnitTester provides unit testing for other Lua scripts. For details see [[:en:Wikipedia:Lua#Unit_testing]].
-- For user documentation see talk page.
local UnitTester = {}

local frame, tick, cross
local result_table_header = "{|class=\"wikitable\"\n! !! Text !! Expected !! Actual"
local result_table = ''
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

function UnitTester:preprocess_equals(text, expected, options)
    local actual = frame:preprocess(text)
    if actual == expected then
        result_table = result_table .. '| ' .. tick
    else
        result_table = result_table .. '| ' .. cross
        num_failures = num_failures + 1
    end
    local nowiki_open = (options and options.nowiki) and '<nowiki>' or ''
    local nowiki_close = (options and options.nowiki) and '</nowiki>' or ''
    local differs_at = self.differs_at and (' || ' .. first_difference(expected, actual)) or ''
    result_table = result_table .. ' || <nowiki>' .. text:gsub('%|', '&#124;') .. '</nowiki> || ' .. nowiki_open .. expected .. nowiki_close .. ' || ' .. nowiki_open .. actual .. nowiki_close .. 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 = result_table .. '| ' .. tick
    else
        result_table = result_table .. '| ' .. cross
        num_failures = num_failures + 1
    end
    local nowiki_open = (options and options.nowiki) and '<nowiki>' or ''
    local nowiki_close = (options and options.nowiki) and '</nowiki>' or ''
    local differs_at = self.differs_at and (' || ' .. first_difference(expected, actual)) or ''
    result_table = result_table .. ' || <nowiki>' .. text1:gsub('%|', '&#124;') .. '</nowiki> || ' .. nowiki_open .. expected .. nowiki_close .. ' || ' .. nowiki_open .. actual .. nowiki_close .. 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 = result_table .. '| ' .. tick
    else
        result_table = result_table .. '| ' .. cross
        num_failures = num_failures + 1
    end
    local nowiki_open = (options and options.nowiki) and '<nowiki>' or ''
    local nowiki_close = (options and options.nowiki) and '</nowiki>' or ''
    local differs_at = self.differs_at and (' || ' .. first_difference(expected, actual)) or ''
    result_table = result_table .. ' || ' .. name .. ' || ' .. nowiki_open .. expected .. nowiki_close .. ' || ' .. nowiki_open .. actual .. nowiki_close .. differs_at .. "\n|-\n"
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 self.differs_at then
        table_header = table_header .. ' !! Differs at'
    end

    for key,value in pairs(self) do
        if key:find('^test') then
            result_table = result_table .. "'''" .. key .. "''':\n" .. table_header .. "\n|-\n"
            value(self)
            result_table = result_table .. "|}\n\n"
        end
    end

    return (num_failures == 0 and "<font color=\"#008000\">'''All tests passed.'''</font>" or "<font color=\"#800000\">'''" .. num_failures .. " tests failed.'''</font>") .. "\n\n" .. frame:preprocess(result_table)
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