prosody
132a3c7b25fa
tools/test_mutants.sh.lua

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tools/test_mutants.sh.lua @ 12765:132a3c7b25fa

tools: Add initial mutation testing script
author Matthew Wild <mwild1@gmail.com>
date Tue, 11 Oct 2022 11:53:48 +0100
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12765
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1 #!/bin/bash
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2
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3 POLYGLOT=1--[===[
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4
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5 set -o pipefail
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6
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7 if [[ "$#" == "0" ]]; then
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8 echo "Lua mutation testing tool"
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9 echo
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10 echo "Usage:"
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11 echo " $BASH_SOURCE MODULE_NAME SPEC_FILE"
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12 echo
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13 echo "Requires 'lua', 'ltokenp' and 'busted' in PATH"
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14 exit 1;
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15 fi
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16
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17 MOD_NAME="$1"
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18 MOD_FILE="$(lua "$BASH_SOURCE" resolve "$MOD_NAME")"
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19
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20 if [[ "$MOD_FILE" == "" || ! -f "$MOD_FILE" ]]; then
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21 echo "EE: Failed to locate module '$MOD_NAME' ($MOD_FILE)";
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22 exit 1;
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23 fi
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24
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25 SPEC_FILE="$2"
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26
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27 if [[ "$SPEC_FILE" == "" ]]; then
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28 SPEC_FILE="spec/${MOD_NAME/./_}_spec.lua"
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29 fi
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30
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31 if [[ "$SPEC_FILE" == "" || ! -f "$SPEC_FILE" ]]; then
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32 echo "EE: Failed to find test spec file ($SPEC_FILE)"
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33 exit 1;
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34 fi
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35
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36 if ! busted "$SPEC_FILE"; then
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37 echo "EE: Tests fail on original source. Fix it"\!;
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38 exit 1;
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39 fi
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40
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41 export MUTANT_N=0
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42 LIVING_MUTANTS=0
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43
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44 FILE_PREFIX="${MOD_FILE%.*}.mutant-"
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45 FILE_SUFFIX=".${MOD_FILE##*.}"
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46
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47 gen_mutant () {
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48 echo "Generating mutant $2 to $3..."
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49 ltokenp -s "$BASH_SOURCE" "$1" > "$3"
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50 return "$?"
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51 }
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52
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53 # $1 = MOD_NAME, $2 = MUTANT_N, $3 = SPEC_FILE
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54 test_mutant () {
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55 (
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56 ulimit -m 131072 # 128MB
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57 ulimit -t 16 # 16s
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58 ulimit -f 32768 # 128MB (?)
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59 exec busted --helper="$BASH_SOURCE" -Xhelper mutate="$1":"$2" "$3"
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60 ) >/dev/null
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61 return "$?";
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62 }
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63
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64 MUTANT_FILE="${FILE_PREFIX}${MUTANT_N}${FILE_SUFFIX}"
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65
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66 gen_mutant "$MOD_FILE" "$MUTANT_N" "$MUTANT_FILE"
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67 while [[ "$?" == "0" ]]; do
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68 if ! test_mutant "$MOD_NAME" "$MUTANT_N" "$SPEC_FILE"; then
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69 echo "Tests successfully killed mutant $MUTANT_N";
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70 rm "$MUTANT_FILE";
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71 else
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72 echo "Mutant $MUTANT_N lives on"\!
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73 LIVING_MUTANTS=$((LIVING_MUTANTS+1))
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74 fi
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75 MUTANT_N=$((MUTANT_N+1))
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76 MUTANT_FILE="${FILE_PREFIX}${MUTANT_N}${FILE_SUFFIX}"
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77 gen_mutant "$MOD_FILE" "$MUTANT_N" "$MUTANT_FILE"
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78 done
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79
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80 if [[ "$?" != "2" ]]; then
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81 echo "Failed: $?"
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82 exit "$?";
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83 fi
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84
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85 MUTANT_SCORE="$(lua -e "print(('%0.2f'):format((1-($LIVING_MUTANTS/$MUTANT_N))*100))")"
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86 if test -f mutant-scores.txt; then
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87 echo "$MOD_NAME $MUTANT_SCORE" >> mutant-scores.txt
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88 fi
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89 echo "$MOD_NAME: All $MUTANT_N mutants generated, $LIVING_MUTANTS survived (score: $MUTANT_SCORE%)"
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90 rm "$MUTANT_FILE"; # Last file is always unmodified
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91 exit 0;
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92 ]===]
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93
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94 -- busted helper that runs mutations
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95 if arg then
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96 if arg[1] == "resolve" then
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97 local filename = package.searchpath(assert(arg[2], "no module name given"), package.path);
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98 if filename then
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99 print(filename);
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100 end
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101 os.exit(filename and 0 or 1);
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102 end
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103 local mutants = {};
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104
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105 for i = 1, #arg do
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106 local opt = arg[i];
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107 print("LOAD", i, opt)
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108 local module_name, mutant_n = opt:match("^mutate=([^:]+):(%d+)");
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109 if module_name then
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110 mutants[module_name] = tonumber(mutant_n);
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111 end
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112 end
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113
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114 local orig_lua_searcher = package.searchers[2];
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115
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116 local function mutant_searcher(module_name)
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117 local mutant_n = mutants[module_name];
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118 if not mutant_n then
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119 return orig_lua_searcher(module_name);
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120 end
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121 local base_file, err = package.searchpath(module_name, package.path);
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122 if not base_file then
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123 return base_file, err;
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124 end
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125 local mutant_file = base_file:gsub("%.lua$", (".mutant-%d.lua"):format(mutant_n));
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126 return loadfile(mutant_file), mutant_file;
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127 end
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128
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129 if next(mutants) then
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130 table.insert(package.searchers, 1, mutant_searcher);
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131 end
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132 end
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133
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134 -- filter for ltokenp to mutate scripts
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135 do
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136 local last_output = {};
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137 local function emit(...)
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138 last_output = {...};
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139 io.write(...)
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140 io.write(" ")
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141 return true;
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142 end
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143
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144 local did_mutate = false;
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145 local count = -1;
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146 local threshold = tonumber(os.getenv("MUTANT_N")) or 0;
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147 local function should_mutate()
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148 count = count + 1;
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149 return count == threshold;
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150 end
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151
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152 local function mutate(name, value)
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153 if name == "if" then
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154 -- Bypass conditionals
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155 if should_mutate() then
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156 return emit("if true or");
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157 elseif should_mutate() then
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158 return emit("if false and");
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159 end
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160 elseif name == "<integer>" then
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161 -- Introduce off-by-one errors
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162 if should_mutate() then
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163 return emit(("%d"):format(tonumber(value)+1));
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164 elseif should_mutate() then
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165 return emit(("%d"):format(tonumber(value)-1));
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166 end
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167 elseif name == "and" then
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168 if should_mutate() then
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169 return emit("or");
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170 end
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171 elseif name == "or" then
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172 if should_mutate() then
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173 return emit("and");
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174 end
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175 end
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176 end
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177
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178 local current_line_n, current_line_input, current_line_output = 0, {}, {};
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179 function FILTER(line_n,token,name,value)
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180 if current_line_n ~= line_n then -- Finished a line, moving to the next?
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181 if did_mutate and did_mutate.line == current_line_n then
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182 -- The line we finished was mutated. Store the original and modified outputs.
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183 did_mutate.line_original_src = table.concat(current_line_input, " ");
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184 did_mutate.line_modified_src = table.concat(current_line_output, " ");
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185 end
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186 current_line_input = {};
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187 current_line_output = {};
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188 end
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189 current_line_n = line_n;
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190 if name == "<file>" then return; end
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191 if name == "<eof>" then
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192 if not did_mutate then
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193 return os.exit(2);
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194 else
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195 emit(("\n-- Mutated line %d (changed '%s' to '%s'):\n"):format(did_mutate.line, did_mutate.original, did_mutate.modified))
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196 emit( ("-- Original: %s\n"):format(did_mutate.line_original_src))
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197 emit( ("-- Modified: %s\n"):format(did_mutate.line_modified_src));
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198 return;
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199 end
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200 end
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201 if name == "<string>" then
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202 value = string.format("%q",value);
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203 end
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204 if mutate(name, value) then
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205 did_mutate = {
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206 original = value;
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207 modified = table.concat(last_output);
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208 line = line_n;
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209 };
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210 else
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211 emit(value);
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212 end
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213 table.insert(current_line_input, value);
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214 table.insert(current_line_output, table.concat(last_output));
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215 end
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216 end
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217