Module:Convert/tester

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This module runs unit tests to compare template output with expected text. In addition, the module can output the results of expanding templates.

While intended for testing Module:Convert, the tester should be useful with other templates that require many tests using a simple format for the test input.

Testcases example[edit]

It is not necessary to save the testcases page before viewing test results. For example, Module:Convert/sandbox/testcases could be edited to change the tests. While still editing that page, paste "Module talk:Convert/sandbox/testcases" (without quotes) into the page title box under "Preview page with this template", then click "Show preview".

The testcases talk page (for example, Module talk:Convert/sandbox/testcases) contains:

{{#invoke:convert/sandbox/testcases|run_tests}}

The testcases module page (for example, Module:Convert/sandbox/testcases) may contain:

local tests = [==[

A template to be tested must be at the start of a line.
Lines which do not start with a template are ignored.
{{convert/sandbox|1|acre|lk=on}}            1 [[acre]] (0.40 [[hectare|ha]])
{{convert/sandbox|1|m2|acres|lk=on}}        1 [[square metre]] (0.00025 [[acre]]s)
{{convert/sandbox|0.16|/l|2|disp=table}}    align="right"|0.16\n|align="right"|0.61

]==]

local p = require('Module:Convert/tester')
p.tests = tests
return p

If wanted, the tests can be run using a template different from the one specified in the tests. For example, the following would run the tests from Module:Convert/sandbox/testcases, but would change the name of each template found on that page to "convert/sandbox2".

{{#invoke:convert/sandbox/testcases|run_tests|template=convert/sandbox2}}

Format[edit]

Tests are extracted from a multiline string. Any line that does not start with a template is ignored. Each processed line starts with a template, and is followed by whitespace, then the wikitext which should result from expanding the template.

The expected output must be entered in a single line. If the template outputs multiple lines, those lines must be joined with "\n" (two characters—backslash n).

The templates do not have to be the same, for example, the following tests would work:

local tests = [==[

{{convert|12|m}}                            12 metres (39 ft)
{{convert/sandbox|12|m}}                    12 metres (39 ft)
{{age|1989|7|23|2003|7|14}}                 13
{{age in days|2007|5|24|2008|4|23}}         335

]==]

In the results, the status column shows "Pass" if the output from the template exactly matches the expected text. If there is no expected text, the template output is shown in the Actual column with a blank status. If the given expected text differs from the template output, the template output is shown in the Actual column with status "Fail", and the number of fails is shown at the top of the page. Searching the page for "Fail" will find each problem. Any "Fail" result is followed by a row showing the nowiki actual and expected wikitext.

Specifying tests[edit]

If using a testcases module (as in the above example), the test text is assigned to p.tests before executing run_tests.

Alternatively, the test text can be read from any page, or from any section on any page. For example, the following wikitext could be entered in a sandbox:

== Mixed tests ==
<pre>
{{convert|12|m}}                            12 metres (39 ft)
{{convert/sandbox|0.16|/l|2|disp=table}}    align="right"|0.16\n|align="right"|0.61
{{age in days|2007|5|24|2008|4|23}}         335
--- The following line is incorrect to demonstrate a "fail".
{{convert|12|m|lk=on}}                      12 [[meter|metres]] (39 [[Foot|ft]])
The following line demonstrates the result when no expected text is provided.
{{convert/sandbox|1|-|5|in|mm|lk=on}}
</pre>

Given the above, the tests can be run as shown in the following section.

Instead of specifying the tests with a multiline string, it is possible to assign a table to p.tests as shown in the following testcases module.

local tests = {
    -- Each test item is of form { template, expected }.
    { '{{convert|12|m}}', '12 metres (39 ft)' },
    { '{{convert/sandbox|0.16|/l|2|disp=table}}', 'align="right"|0.16\n|align="right"|0.61' },
    { '{{age in days|2007|5|24|2008|4|23}}', '335' },
    { '{{convert|12|m|lk=on}}', '12 [[meter|metres]] (39 [[Foot|ft]])' },
    { '{{convert/sandbox|1|-|5|in|mm|lk=on}}' },
}

local p = require('Module:Convert/tester')
p.tests = tests
return p

This example provides the same results as the multiline string at "Mixed tests" above.

Running tests from any page[edit]

Entering either of the following lines of wikitext in a sandbox or talk page would run the tests found at the specified location. The first line would show all tests on page "Template talk:Example", while the second would show only those tests on that page that are in the "Mixed tests" section.

{{#invoke:convert/tester|run_tests|page=Template talk:Example}}
{{#invoke:convert/tester|run_tests|page=Template talk:Example|section=Mixed tests}}

As a demonstration, the following line is used to produce the table shown below, including the comment that starts with three dashes.

{{#invoke:convert/tester|run_tests|page=Module:Convert/tester/doc|section=Specifying tests|show=all}}

2 tests failed, 1 test ignored because expected text is blank.

Template Expected Actual, if different Status
{{convert|12|m}} 12 metres (39 ft) Pass
{{convert/sandbox|0.16|/l|2|disp=table}} align="right"|0.16
|align="right"|0.61
style="text-align:right;"|0.16
|style="text-align:right;"|0.61
Fail
(above, nowiki) align="right"|0.16
|align="right"|0.61
style="text-align:right;"|0.16
|style="text-align:right;"|0.61
{{age in days|2007|5|24|2008|4|23}} 335 Pass
The following line is incorrect to demonstrate a "fail". Cmnt
{{convert|12|m|lk=on}} 12 metres (39 ft) 12 metres (39 ft) Fail
(above, nowiki) 12 [[meter|metres]] (39&nbsp;[[Foot|ft]]) 12 [[metre]]s (39&nbsp;[[Foot (unit)|ft]])
{{convert/sandbox|1|-|5|in|mm|lk=on}} 1–5 inches (25–127 mm)

Making expected results[edit]

Function make_tests can be used to create tests in the format expected by run_tests. For example, previewing either of the following in a sandbox would show the results from expanding each template found on the specified page.

{{#invoke:convert/tester|make_tests|page=Template talk:Example}}
{{#invoke:convert/tester|make_tests|page=Template talk:Example|show=all}}

When using make_tests, any expected results in the input are ignored. Instead, the module shows each template and its actual output as plain text which can be copied to make a testcases page. The templates to be processed can be specified by setting p.tests or by specifying a page with an optional section.

If |show=all is included, any non-template lines are included in the result. The output could then be copied and used to replace the page with the tests in order to update the expected text for each template, but without changing non-template lines.

As a demonstration, the following line is used to produce the text shown below.

{{#invoke:convert/tester|make_tests|page=Module:Convert/tester/doc|section=Specifying tests}}
{{convert|12|m}}                          12 metres (39&nbsp;ft)
{{convert/sandbox|0.16|/l|2|disp=table}}  style="text-align:right;"|0.16\n|style="text-align:right;"|0.61
{{age in days|2007|5|24|2008|4|23}}       335
{{convert|12|m|lk=on}}                    12 [[metre]]s (39&nbsp;[[Foot (unit)|ft]])
{{convert/sandbox|1|-|5|in|mm|lk=on}}     1–5 [[inch|inches]] (25–127&nbsp;[[Millimetre|mm]])

Using show=all[edit]

The |show=all option can be used with make_tests and with run_tests.

An example using make_tests is shown in the previous section.

Using |show=all with run_tests allows comment lines to be displayed in the output table—not all lines are shown, only those that start with three dashes. For example, the testcases may include the following.

Added 12 January 2014.
--- The following tests check the widget option.
{{example|1|2|widget=on}}          ...(expected output)...

The table produced by run_tests would show "The following tests check the widget option." as a comment line, but only if |show=all is used. Comments have a distinctive background color, but also show "Cmnt" in the status column so they can be found by searching.

Comparing a module with its sandbox[edit]

When viewing a module, the documentation page is displayed; if the module has a sandbox, the documentation includes "Editors can experiment in this module's sandbox" with a link to diff the module and its sandbox.

The tester module provides a compare function which can check a series of modules, and compare each with its sandbox. A table is displayed showing whether the content is different, with a diff link.

For example, the following wikitext could be used.

{{#invoke:convert/tester|compare|Example|Example/data}}

The names "Example" and "Example/data" do not include a colon (:), so "Module:" is assumed. The command compares Module:Example with Module:Example/sandbox, and Module:Example/data with Module:Example/data/sandbox.

It is also possible for a module to define pairs of page titles in p.pairs (a table), and to use the tester module to generate a table for each pair of titles.

As a convenience, certain keywords are defined. For example, the following uses the "convert" keyword.

{{#invoke:convert/tester|compare|convert}}

The following text is a sample showing output that may result from the above.

-- Test the output from a template by comparing it with fixed text.
-- The expected text must be in a single line, but can include
-- "\n" (two characters) to indicate that a newline is expected.
-- Tests are run (or created) by setting p.tests (string or table), or
-- by setting page=PAGE_TITLE (and optionally section=SECTION_TITLE),
-- then executing run_tests (or make_tests).

local function collection()
	-- Return a table to hold lines of text.
	return {
		n = 0,
		add = function (self, s)
			self.n = self.n + 1
			self[self.n] = s
		end,
		join = function (self, sep)
			return table.concat(self, sep)
		end,
	}
end

local function empty(text)
	-- Return true if text is nil or empty (assuming a string).
	return text == nil or text == ''
end

local function strip(text)
	-- Return text with no leading/trailing whitespace.
	return text:match("^%s*(.-)%s*$")
end

local function status_box(stats, expected, actual, iscomment)
	local label, bgcolor, align, isfail
	if iscomment then
		actual = ''
		align = 'center'
		bgcolor = 'silver'
		label = 'Cmnt'
	elseif expected == '' then
		stats.ignored = stats.ignored + 1
		return '', actual
	elseif expected == actual then
		stats.pass = stats.pass + 1
		actual = ''
		align = 'center'
		bgcolor = 'green'
		label = 'Pass'
	else
		stats.fail = stats.fail + 1
		align = 'center'
		bgcolor = 'red'
		label = 'Fail'
		isfail = true
	end
	local sbox = 'style="text-align:' .. align .. ';color:white;background:' .. bgcolor .. ';" | ' .. label
	return sbox, actual, isfail
end

local function status_text(stats)
	local bgcolor, ignored_text, msg
	if stats.fail == 0 then
		if stats.pass == 0 then
			bgcolor = 'salmon'
			msg = 'No tests performed'
		else
			bgcolor = 'green'
			msg = string.format('All %d tests passed', stats.pass)
		end
	else
		bgcolor = 'darkred'
		msg = string.format('%d test%s failed', stats.fail, stats.fail == 1 and '' or 's')
	end
	if stats.ignored == 0 then
		ignored_text = ''
	else
		bgcolor = 'salmon'
		ignored_text = string.format(', %d test%s ignored because expected text is blank', stats.ignored, stats.ignored == 1 and '' or 's')
	end
	return '<span style="font-size:120%;color:white;background-color:' .. bgcolor .. ';">' .. msg .. ignored_text .. '.</span>'
end

local function run_template(frame, template, forcename, collapse_multiline)
	-- Template "{{ example |  2  =  def  |  abc  |  name  =  ghi jkl  }}"
	-- gives args { "  abc  ", "def", name = "ghi jkl" }.
	if template:sub(1, 2) == '{{' and template:sub(-2, -1) == '}}' then
		template = template:sub(3, -3) .. '|'  -- append sentinel to get last field
	else
		return '(invalid template)'
	end
	local args = {}
	local index = 1
	local templatename
	local function put_arg(k, v)
		-- Kludge: Module:Val uses Module:Arguments which trims arguments and
		-- omits blank arguments. Simulate that here.
		-- LATER Need a parameter to control this.
		if templatename:sub(1, 3) == 'val' then
			v = strip(v)
			if v == '' then
				return
			end
		end
		args[k] = v
	end
	template = template:gsub('(%[%[[^%[%]]-)|(.-%]%])', '%1\0%2')  -- replace pipe in piped link with a zero byte
	for field in template:gmatch('(.-)|') do
		field = field:gsub('%z', '|')  -- restore pipe in piped link
		if templatename == nil then
			templatename = forcename or strip(field)
			if templatename == '' then
				return '(invalid template)'
			end
		else
			local k, eq, v = field:match("^(.-)(=)(.*)$")
			if eq then
				k, v = strip(k), strip(v)  -- k and/or v can be empty
				local i = tonumber(k)
				if i and i > 0 and string.match(k, '^%d+$') then
					put_arg(i, v)
				else
					put_arg(k, v)
				end
			else
				while args[index] ~= nil do
					-- Skip any explicit numbered parameters like "|5=five".
					index = index + 1
				end
				put_arg(index, field)
			end
		end
	end
	local function expand(t)
		return frame:expandTemplate(t)
	end
	local ok, result = pcall(expand, { title = templatename, args = args })
	if not ok then
		result = 'Error: ' .. result
	end
	if collapse_multiline then
		result = result:gsub('\n', '\\n')
	end
	return result
end

local function _make_tests(frame, all_tests, forcename)
	local maxlen = 38
	for _, item in ipairs(all_tests) do
		local template = item[1]
		if template then
			local templen = mw.ustring.len(template)
			item.templen = templen
			if maxlen < templen and templen <= 70 then
				maxlen = templen
			end
		end
	end
	local result = collection()
	for _, item in ipairs(all_tests) do
		local template = item[1]
		if template then
			local actual = run_template(frame, template, forcename, true)
			local pad = string.rep(' ', maxlen - item.templen) .. '  '
			result:add(template .. pad .. actual)
		else
			local text = item.text
			if text then
				result:add(text)
			end
		end
	end
	-- Pre tags returned by a module are html tags, not like wikitext <pre>...</pre>.
	return '<pre>\n' .. mw.text.nowiki(result:join('\n')) .. '\n</pre>'
end

local function _run_tests(frame, all_tests, forcename)
	local function safe_cell(text, multiline)
		-- For testing {{convert}}, want wikitext like '[[kilogram|kg]]' to be unchanged
		-- so the link works and so the displayed text is short (just "kg" in example).
		text = text:gsub('(%[%[[^%[%]]-)|(.-%]%])', '%1\0%2')  -- replace pipe in piped link with a zero byte
		text = text:gsub('{', '&#123;'):gsub('|', '&#124;')    -- escape '{' and '|'
		text = text:gsub('%z', '|')                            -- restore pipe in piped link
		if multiline then
			text = text:gsub('\\n', '<br />')
		end
		return text
	end
	local function nowiki_cell(text, multiline)
		text = mw.text.nowiki(text)
		if multiline then
			text = text:gsub('\\n', '<br />')
		end
		return text
	end
	local stats = { pass = 0, fail = 0, ignored = 0 }
	local result = collection()
	result:add('{| class="wikitable"')
	result:add('! Template !! Expected !! Actual, if different !! Status')
	for _, item in ipairs(all_tests) do
		local template, expected = item[1], item[2] or ''
		if template then
			local actual = run_template(frame, template, forcename, true)
			local sbox, actual, isfail = status_box(stats, expected, actual)
			result:add('|-')
			result:add('| ' .. safe_cell(template))
			result:add('| ' .. safe_cell(expected, true))
			result:add('| ' .. safe_cell(actual, true))
			result:add('| ' .. sbox)
			if isfail then
				result:add('|-')
				result:add('| align="center"| (above, nowiki)')
				result:add('| ' .. nowiki_cell(expected, true))
				result:add('| ' .. nowiki_cell(actual, true))
				result:add('|')
			end
		else
			local text = item.text
			if text and text:sub(1, 3) == '---' then
				result:add('|-')
				result:add('| colspan="3" style="color:white;background:silver;" | ' .. safe_cell(strip(text:sub(4)), true))
				result:add('| ' .. status_box(stats, '', '', true))
			end
		end
	end
	result:add('|}')
	return status_text(stats) .. '\n\n' .. result:join('\n')
end

local function get_page_content(page_title)
	local t = mw.title.new(page_title)
	if t then
		local content = t:getContent()
		if content then
			if content:sub(-1) ~= '\n' then
				content = content .. '\n'
			end
			return content
		end
	end
	error('Could not read wikitext from "[[' .. page_title .. ']]".', 0)
end

local function _compare(frame, page_pairs)
	local function diff_link(title1, title2)
		return '<span class="plainlinks">[' ..
			tostring(mw.uri.fullUrl('Special:ComparePages',
				{ page1 = title1, page2 = title2 })) ..
			' diff]</span>'
	end
	local function link(title)
		return '[[' .. title .. ']]'
	end
	local function message(text, isgood)
		local color = isgood and 'green' or 'darkred'
		return '<span style="color:' .. color .. ';">' .. text .. '</span>'
	end
	local result = collection()
	for _, item in ipairs(page_pairs) do
		local label
		local title1 = item[1]
		local title2 = item[2]
		if title1 == title2 then
			label = message('same title', false)
		else
			local content1 = get_page_content(title1)
			local content2 = get_page_content(title2)
			if content1 == content2 then
				label = message('same content', true)
			else
				label = message('different', false) .. ' (' .. diff_link(title1, title2) .. ')'
			end
		end
		result:add('*' .. link(title1) .. ' • ' .. link(title2) .. ' • ' .. label)
	end
	return result:join('\n')
end

local function sections(text)
	return {
		first = 1,  -- just after the newline at the end of the last heading
		this_section = 1,
		next_heading = function(self)
			local first = self.first
			while first <= #text do
				local last, heading
				first, last, heading = text:find('==+[\t ]*([^\n]-)[\t ]*==+[\t\r ]*\n', first)
				if first then
					if first == 1 or text:sub(first - 1, first - 1) == '\n' then
						self.this_section = first
						self.first = last + 1
						return heading
					end
					first = last + 1
				else
					break
				end
			end
			self.first = #text + 1
			return nil
		end,
		current_section = function(self)
			local first = self.this_section
			local last = text:find('\n==[^\n]-==[\t\r ]*\n', first)
			if not last then
				last = -1
			end
			return text:sub(first, last)
		end,
	}
end

local function get_tests(frame, tests)
	local args = frame.args
	local page_title, section_title = args.page, args.section
	local show_all = (args.show == 'all')
	if not empty(page_title) then
		if not empty(tests) then
			error('Invoke must not set "page=' .. page_title .. '" if also setting p.tests.', 0)
		end
		if page_title:sub(1, 2) == '[[' and page_title:sub(-2) == ']]' then
			page_title = strip(page_title:sub(3, -3))
		end
		tests = get_page_content(page_title)
		if not empty(section_title) then
			local s = sections(tests)
			while true do
				local heading = s:next_heading()
				if heading then
					if heading == section_title then
						tests = s:current_section()
						break
					end
				else
					error('Section "' .. section_title .. '" not found in page [[' .. page_title .. ']].', 0)
				end
			end
		end
	end
	if type(tests) ~= 'string' then
		if type(tests) == 'table' then
			return tests
		end
		error('No tests were specified; see [[Module:Convert/tester/doc]].', 0)
	end
	if tests:sub(-1) ~= '\n' then
		tests = tests .. '\n'
	end
	local template_count = 0
	local all_tests = collection()
	for line in (tests):gmatch('([^\n]-)[\t\r ]*\n') do
		local template, expected = line:match('^({{.-}})%s*(.-)%s*$')
		if template then
			template_count = template_count + 1
			all_tests:add({ template, expected })
		elseif show_all then
			all_tests:add({ text = line })
		end
	end
	if template_count == 0 then
		error('No templates found; see [[Module:Convert/tester/doc]].', 0)
	end
	return all_tests
end

local function main(frame, p, worker)
	local args = frame.args
	local ok, result = pcall(get_tests, frame, p.tests)
	if ok then
		ok, result = pcall(worker, frame, result, args.template)
		if ok then
			return result
		end
	end
	return '<strong class="error">Error</strong>\n\n' .. result
end

local modules = {
	-- For convenience, a key defined here can be used to refer to the
	-- corresponding list of modules.
	convert = {
		'Convert',
		'Convert/data',
		'Convert/text',
		'Convert/extra',
		'Convert/wikidata',
		'Convert/wikidata/data',
	},
	cs1 = {
		'Citation/CS1',
		'Citation/CS1/Configuration',
	},
	cs1all = {
		'Citation/CS1',
		'Citation/CS1/Configuration',
		'Citation/CS1/Whitelist',
		'Citation/CS1/Date validation',
	},
	team = {
		'Team appearances list',
		'Team appearances list/data',
		'Team appearances list/show',
	},
	val = {
		'Val',
		'Val/units',
	},
}

local p = {}

function p.compare(frame)
	local page_pairs = p.pairs
	if not page_pairs then
		local args = frame.args
		if not args[2] then
			local builtins = modules[args[1] or 'convert']
			if builtins then
				args = builtins
			end
		end
		page_pairs = {}
		for i, title in ipairs(args) do
			if not title:find(':', 1, true) then
				title = 'Module:' .. title
			end
			page_pairs[i] = { title, title .. '/sandbox' }
		end
	end
	local ok, result = pcall(_compare, frame, page_pairs)
	if ok then
		return result
	end
	return '<strong class="error">Error</strong>\n\n' .. result
end

p.check_sandbox = p.compare

function p.make_tests(frame)
	return main(frame, p, _make_tests)
end

function p.run_tests(frame)
	return main(frame, p, _run_tests)
end

return p