File

tools/test_mutants.sh.lua @ 13264:9b720c38fee8

mod_cron: Revert bbd3ac65640d Maybe it is better to run daily and weekly tasks 'now' on the theory that people set these things up during times that are appropriate for maintenance already, so the same time next day or next week might be fine for periodic cleanup.
author Kim Alvefur <zash@zash.se>
date Sun, 30 Jul 2023 13:03:40 +0200
parent 12765:132a3c7b25fa
line wrap: on
line source

#!/bin/bash

POLYGLOT=1--[===[

set -o pipefail

if [[ "$#" == "0" ]]; then
	echo "Lua mutation testing tool"
	echo
	echo "Usage:"
	echo "    $BASH_SOURCE MODULE_NAME SPEC_FILE"
	echo
	echo "Requires 'lua', 'ltokenp' and 'busted' in PATH"
	exit 1;
fi

MOD_NAME="$1"
MOD_FILE="$(lua "$BASH_SOURCE" resolve "$MOD_NAME")"

if [[ "$MOD_FILE" == "" || ! -f "$MOD_FILE" ]]; then
	echo "EE: Failed to locate module '$MOD_NAME' ($MOD_FILE)";
	exit 1;
fi

SPEC_FILE="$2"

if [[ "$SPEC_FILE" == "" ]]; then
	SPEC_FILE="spec/${MOD_NAME/./_}_spec.lua"
fi

if [[ "$SPEC_FILE" == "" || ! -f "$SPEC_FILE" ]]; then
	echo "EE: Failed to find test spec file ($SPEC_FILE)"
	exit 1;
fi

if ! busted "$SPEC_FILE"; then
	echo "EE: Tests fail on original source. Fix it"\!;
	exit 1;
fi

export MUTANT_N=0
LIVING_MUTANTS=0

FILE_PREFIX="${MOD_FILE%.*}.mutant-"
FILE_SUFFIX=".${MOD_FILE##*.}"

gen_mutant () {
	echo "Generating mutant $2 to $3..."
	ltokenp -s "$BASH_SOURCE" "$1" > "$3"
	return "$?"
}

# $1 = MOD_NAME, $2 = MUTANT_N, $3 = SPEC_FILE
test_mutant () {
	(
		ulimit -m 131072 # 128MB
		ulimit -t 16     # 16s
		ulimit -f 32768  # 128MB (?)
		exec busted --helper="$BASH_SOURCE" -Xhelper mutate="$1":"$2" "$3"
	) >/dev/null
	return "$?";
}

MUTANT_FILE="${FILE_PREFIX}${MUTANT_N}${FILE_SUFFIX}"

gen_mutant "$MOD_FILE" "$MUTANT_N" "$MUTANT_FILE"
while [[ "$?" == "0" ]]; do
	if ! test_mutant "$MOD_NAME" "$MUTANT_N" "$SPEC_FILE"; then
		echo "Tests successfully killed mutant $MUTANT_N";
		rm "$MUTANT_FILE";
	else
		echo "Mutant $MUTANT_N lives on"\!
		LIVING_MUTANTS=$((LIVING_MUTANTS+1))
	fi
	MUTANT_N=$((MUTANT_N+1))
	MUTANT_FILE="${FILE_PREFIX}${MUTANT_N}${FILE_SUFFIX}"
	gen_mutant "$MOD_FILE" "$MUTANT_N" "$MUTANT_FILE"
done

if [[ "$?" != "2" ]]; then
	echo "Failed: $?"
	exit "$?";
fi

MUTANT_SCORE="$(lua -e "print(('%0.2f'):format((1-($LIVING_MUTANTS/$MUTANT_N))*100))")"
if test -f mutant-scores.txt; then
	echo "$MOD_NAME $MUTANT_SCORE" >> mutant-scores.txt
fi
echo "$MOD_NAME: All $MUTANT_N mutants generated, $LIVING_MUTANTS survived (score: $MUTANT_SCORE%)"
rm "$MUTANT_FILE"; # Last file is always unmodified
exit 0;
]===]

-- busted helper that runs mutations
if arg then
	if arg[1] == "resolve" then
		local filename = package.searchpath(assert(arg[2], "no module name given"), package.path);
		if filename then
			print(filename);
		end
		os.exit(filename and 0 or 1);
	end
	local mutants = {};

	for i = 1, #arg do
		local opt = arg[i];
		print("LOAD", i, opt)
		local module_name, mutant_n = opt:match("^mutate=([^:]+):(%d+)");
		if module_name then
			mutants[module_name] = tonumber(mutant_n);
		end
	end

	local orig_lua_searcher = package.searchers[2];

	local function mutant_searcher(module_name)
		local mutant_n = mutants[module_name];
		if not mutant_n then
			return orig_lua_searcher(module_name);
		end
		local base_file, err = package.searchpath(module_name, package.path);
		if not base_file then
			return base_file, err;
		end
		local mutant_file = base_file:gsub("%.lua$", (".mutant-%d.lua"):format(mutant_n));
		return loadfile(mutant_file), mutant_file;
	end

	if next(mutants) then
		table.insert(package.searchers, 1, mutant_searcher);
	end
end

-- filter for ltokenp to mutate scripts
do
	local last_output = {};
	local function emit(...)
		last_output = {...};
		io.write(...)
		io.write(" ")
		return true;
	end

	local did_mutate = false;
	local count = -1;
	local threshold = tonumber(os.getenv("MUTANT_N")) or 0;
	local function should_mutate()
		count = count + 1;
		return count == threshold;
	end

	local function mutate(name, value)
		if name == "if" then
			-- Bypass conditionals
			if should_mutate() then
				return emit("if true or");
			elseif should_mutate() then
				return emit("if false and");
			end
		elseif name == "<integer>" then
			-- Introduce off-by-one errors
			if should_mutate() then
				return emit(("%d"):format(tonumber(value)+1));
			elseif should_mutate() then
				return emit(("%d"):format(tonumber(value)-1));
			end
		elseif name == "and" then
			if should_mutate() then
				return emit("or");
			end
		elseif name == "or" then
			if should_mutate() then
				return emit("and");
			end
		end
	end

	local current_line_n, current_line_input, current_line_output = 0, {}, {};
	function FILTER(line_n,token,name,value)
		if current_line_n ~= line_n then -- Finished a line, moving to the next?
			if did_mutate and did_mutate.line == current_line_n then
				-- The line we finished was mutated. Store the original and modified outputs.
				did_mutate.line_original_src = table.concat(current_line_input, " ");
				did_mutate.line_modified_src = table.concat(current_line_output, " ");
			end
			current_line_input = {};
			current_line_output = {};
		end
		current_line_n = line_n;
		if name == "<file>" then return; end
		if name == "<eof>" then
			if not did_mutate then
				return os.exit(2);
			else
				emit(("\n-- Mutated line %d (changed '%s' to '%s'):\n"):format(did_mutate.line, did_mutate.original, did_mutate.modified))
				emit(  ("--   Original: %s\n"):format(did_mutate.line_original_src))
				emit(  ("--   Modified: %s\n"):format(did_mutate.line_modified_src));
				return;
			end
		end
		if name == "<string>" then
			value = string.format("%q",value);
		end
		if mutate(name, value) then
			did_mutate = {
				original = value;
				modified = table.concat(last_output);
				line = line_n;
			};
		else
			emit(value);
		end
		table.insert(current_line_input, value);
		table.insert(current_line_output, table.concat(last_output));
	end
end