1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
#!/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 --helper=loader "$SPEC_FILE"; then
echo "EE: Tests fail on original source. Fix it"\!;
exit 1;
fi
export MUTANT_N=0
LIVING_MUTANTS=0
FILE_PREFIX="${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
|
