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2ã€ã®æ°å€ãå ç®ããåçŽãªé¢æ°ãæ³åããŠã¿ãŠãã ããã
function add(a, b) {
return a + b;
}
ãã¥ãŒããŒã·ã§ã³æŒç®åã¯ã+æŒç®åã-æŒç®åã«å€æŽããæ¬¡ã®ãããªå€ç°ã³ãŒããäœæãããããããŸããã
function add(a, b) {
return a - b;
}
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èŠãããããšã瀺ããŠããŸãã
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- ãã¥ãŒããŒã·ã§ã³: ãœãŒã¹ã³ãŒãã«å¯ŸããŠè¡ããããå°ãããæ§æçã«æå¹ãªå€æŽã
- ãã¥ãŒã¿ã³ã: ãã¥ãŒããŒã·ã§ã³ãå«ãã³ãŒãã®å€æŽãããããŒãžã§ã³ã
- ãã¥ãŒããŒã·ã§ã³æŒç®å: ãã¥ãŒããŒã·ã§ã³ãã©ã®ããã«é©çšãããããå®çŸ©ããã«ãŒã«ïŒäŸ: ç®è¡æŒç®åã®çœ®æãæ¡ä»¶ã®å€æŽã宿°ã®å€æŽãªã©ïŒã
- ãã¥ãŒã¿ã³ãã®ãã«: å°å ¥ããããã¥ãŒããŒã·ã§ã³ãåå ã§ãã¹ãã±ãŒã¹ã倱æããããšã
- çåãã¥ãŒã¿ã³ã: ãã¥ãŒããŒã·ã§ã³ãååšããã«ããããããããã¹ãŠã®ãã¹ãã±ãŒã¹ããã¹ããããšã
- ãã¥ãŒããŒã·ã§ã³ã¹ã³ã¢: ãã¹ãã¹ã€ãŒãã«ãã£ãŠãã«ããããã¥ãŒã¿ã³ãã®å²åïŒãã«ããããã¥ãŒã¿ã³ãæ° / å šãã¥ãŒã¿ã³ãæ°ïŒããã¥ãŒããŒã·ã§ã³ã¹ã³ã¢ãé«ãã»ã©ããã¹ãã¹ã€ãŒãã®æå¹æ§ãé«ãããšã瀺ããŸãã
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- ãã¹ãã¹ã€ãŒãã®æå¹æ§ã®åäž: ãã¥ãŒããŒã·ã§ã³ãã¹ãã¯ããã¹ãã¹ã€ãŒãã®åŒ±ç¹ãç¹å®ãããã¹ããã³ãŒããé©åã«ã«ããŒããŠããªãé åãæµ®ã圫ãã«ããŸãã
- ã³ãŒãå質ã®åäž: ãã培åºçã§å æ¬çãªãã¹ããäœæããããšã匷å¶ããããšã§ããã¥ãŒããŒã·ã§ã³ãã¹ãã¯ã³ãŒãå質ã®åäžãšãã°ã®åæžã«è²¢ç®ããŸãã
- ãã°ã®ãªã¹ã¯äœæž: ãã¥ãŒããŒã·ã§ã³ãã¹ãã«ãã£ãŠæ€èšŒããããååã«ãã¹ããããã³ãŒãããŒã¹ã¯ãéçºããã³ä¿å®äžã«ãã°ãå°å ¥ãããªã¹ã¯ãäœæžããŸãã
- ãã¹ãã«ãã¬ããžã®å®¢èгçãªæž¬å®: ãã¥ãŒããŒã·ã§ã³ã¹ã³ã¢ã¯ãåŸæ¥ã®ã³ãŒãã«ãã¬ããžã¡ããªã¯ã¹ãè£å®ãããã¹ãã®æå¹æ§ãè©äŸ¡ããããã®å ·äœçãªææšãæäŸããŸãã
- éçºè ã®ä¿¡é Œæ§åäž: ãã¹ãã¹ã€ãŒãããã¥ãŒããŒã·ã§ã³ãã¹ãã䜿çšããŠå³å¯ã«ãã¹ããããŠããããšãç¥ãããšã§ãéçºè ã¯èªåã®ã³ãŒãã®ä¿¡é Œæ§ã«å¯Ÿããèªä¿¡ãæ·±ããŸãã
- ãã¹ãé§åéçºïŒTDDïŒã®ãµããŒã: ãã¥ãŒããŒã·ã§ã³ãã¹ãã¯TDDäžã«è²Žéãªãã£ãŒãããã¯ãæäŸããã³ãŒãã®åã«ãã¹ããèšè¿°ããããšã©ãŒæ€åºã«æå¹ã§ããããšãä¿èšŒããŸãã
ãã¥ãŒããŒã·ã§ã³æŒç®åã®äŸ
ãã¥ãŒããŒã·ã§ã³æŒç®åã¯ããã¥ãŒããŒã·ã§ã³ãã¹ãã®å¿èéšã§ãããããã¯ããã¥ãŒã¿ã³ããäœæããããã«ã³ãŒãã«ã©ã®ãããªçš®é¡ã®å€æŽãå ããããããå®çŸ©ããŸããäžè¬çãªãã¥ãŒããŒã·ã§ã³æŒç®åã®ã«ããŽãªãšãã®äŸã以äžã«ç€ºããŸãã
ç®è¡æŒç®åã®çœ®æ
- Replace
+with-,*,/, or%. - Example:
a + bbecomesa - b
é¢ä¿æŒç®åã®çœ®æ
- Replace
<with<=,>,>=,==, or!=. - Example:
a < bbecomesa <= b
è«çæŒç®åã®çœ®æ
- Replace
&&with||, and vice versa. - Replace
!with nothing (remove the negation). - Example:
a && bbecomesa || b
æ¡ä»¶å¢çãã¥ãŒããŒã¿ãŒ
- å€ããããã«èª¿æŽããŠæ¡ä»¶ã倿ŽããŸãã
- Example:
if (x > 0)becomesif (x >= 0)
宿°çœ®æ
- 宿°ãå¥ã®å®æ°ã«çœ®ãæããŸãïŒäŸ:
0ã1ã«ãnullã空æååã«ïŒã - Example:
int count = 10;becomesint count = 11;
ã¹ããŒãã¡ã³ãã®åé€
- ã³ãŒãããåäžã®ã¹ããŒãã¡ã³ããåé€ããŸããããã«ãããäžè¶³ããŠããnullãã§ãã¯ãäºæããªãåäœãæããã«ãªãå ŽåããããŸãã
- äŸ: ã«ãŠã³ã¿ãŒå€æ°ãæŽæ°ããã³ãŒãè¡ãåé€ããŸãã
æ»ãå€ã®çœ®æ
- æ»ãå€ãç°ãªãå€ã«çœ®ãæããŸãïŒäŸ: trueãfalseã«çœ®ãæããïŒã
- Example: `return true;` becomes `return false;`
䜿çšããããã¥ãŒããŒã·ã§ã³æŒç®åã®å ·äœçãªã»ããã¯ãããã°ã©ãã³ã°èšèªãšäœ¿çšããããã¥ãŒããŒã·ã§ã³ãã¹ãããŒã«ã«äŸåããŸãã
ãã¥ãŒããŒã·ã§ã³ãã¹ãã®å®è£ : å®è·µã¬ã€ã
ãã¥ãŒããŒã·ã§ã³ãã¹ãã®å®è£ ã«ã¯ãããã€ãã®ã¹ããããå«ãŸããŸãã
- ãã¥ãŒããŒã·ã§ã³ãã¹ãããŒã«ã®éžæ: ããŸããŸãªããã°ã©ãã³ã°èšèªåãã«ããã€ãã®ããŒã«ãå©çšå¯èœã§ããäžè¬çãªéžæè¢ã¯æ¬¡ã®ãšããã§ã:
- Java: PIT (PITest)
- JavaScript: Stryker
- Python: MutPy
- C#: Stryker.NET
- PHP: Humbug
- ããŒã«ã®èšå®: ãã¹ã察象ã®ãœãŒã¹ã³ãŒãã䜿çšãããã¹ãã¹ã€ãŒããããã³é©çšãããã¥ãŒããŒã·ã§ã³æŒç®åãæå®ããããã«ããã¥ãŒããŒã·ã§ã³ãã¹ãããŒã«ãèšå®ããŸãã
- ãã¥ãŒããŒã·ã§ã³åæã®å®è¡: ãã¥ãŒããŒã·ã§ã³ãã¹ãããŒã«ãå®è¡ãããã¥ãŒã¿ã³ããçæããŠãããã«å¯ŸããŠãã¹ãã¹ã€ãŒããå®è¡ããŸãã
- çµæã®åæ: ãã¥ãŒããŒã·ã§ã³ãã¹ãã¬ããŒãã調ã¹ãŠãçåãã¥ãŒã¿ã³ããç¹å®ããŸããåçåãã¥ãŒã¿ã³ãã¯ããã¹ãã¹ã€ãŒãã«ãããæœåšçãªã®ã£ããã瀺ããŠããŸãã
- ãã¹ãã¹ã€ãŒãã®æ¹å: çåãã¥ãŒã¿ã³ãããã«ããããã«ãã¹ãã±ãŒã¹ã远å ãŸãã¯å€æŽããŸããçåãã¥ãŒã¿ã³ãã«ãã£ãŠåŒ·èª¿ãããã³ãŒãé åãç¹ã«ã¿ãŒã²ãããšãããã¹ããäœæããããšã«çŠç¹ãåœãŠãŸãã
- ããã»ã¹ã®ç¹°ãè¿ã: æºè¶³ã®ãããã¥ãŒããŒã·ã§ã³ã¹ã³ã¢ãéæãããŸã§ãã¹ããã3ã5ãç¹°ãè¿ããŸããé«ããã¥ãŒããŒã·ã§ã³ã¹ã³ã¢ãç®æããŸããããã¹ãã远å ããéã®è²»çšå¯Ÿå¹æãèæ ®ããŠãã ããã
äŸ: Stryker (JavaScript) ã䜿çšãããã¥ãŒããŒã·ã§ã³ãã¹ã
Strykerãã¥ãŒããŒã·ã§ã³ãã¹ããã¬ãŒã ã¯ãŒã¯ã䜿çšããåçŽãªJavaScriptã®äŸã§ãã¥ãŒããŒã·ã§ã³ãã¹ãã説æããŸãããã
ã¹ããã1: Strykerãã€ã³ã¹ããŒã«
npm install --save-dev @stryker-mutator/core @stryker-mutator/mocha-runner @stryker-mutator/javascript-mutator
ã¹ããã2: JavaScript颿°ãäœæ
// math.js
function add(a, b) {
return a + b;
}
module.exports = add;
ã¹ããã3: ãŠããããã¹ããèšè¿° (Mocha)
// test/math.test.js
const assert = require('assert');
const add = require('../math');
describe('add', () => {
it('should return the sum of two numbers', () => {
assert.strictEqual(add(2, 3), 5);
});
});
ã¹ããã4: Strykerãèšå®
// stryker.conf.js
module.exports = function(config) {
config.set({
mutator: 'javascript',
packageManager: 'npm',
reporters: ['html', 'clear-text', 'progress'],
testRunner: 'mocha',
transpilers: [],
testFramework: 'mocha',
coverageAnalysis: 'perTest',
mutate: ["math.js"]
});
};
ã¹ããã5: Strykerãå®è¡
npm run stryker
Strykerã¯ã³ãŒãã«å¯ŸããŠãã¥ãŒããŒã·ã§ã³åæãå®è¡ãããã¥ãŒããŒã·ã§ã³ã¹ã³ã¢ãšçåãã¥ãŒã¿ã³ãã瀺ãã¬ããŒããçæããŸããæåã®ãã¹ãããã¥ãŒã¿ã³ãããã«ã§ããªãã£ãå ŽåïŒäŸ: 以åã«add(2,3)ã®ãã¹ãããªãã£ãå ŽåïŒãStrykerã¯ããã匷調衚瀺ããããè¯ããã¹ããå¿
èŠã§ããããšã瀺ããŸãã
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- ç䟡ãã¥ãŒã¿ã³ã: äžéšã®ãã¥ãŒã¿ã³ãã¯å ã®ã³ãŒããšè«ççã«ç䟡ã§ããå¯èœæ§ããããã€ãŸããã©ã®ãã¹ããããããåºå¥ã§ããŸãããç䟡ãã¥ãŒã¿ã³ããç¹å®ããæé€ããã«ã¯æéããããå ŽåããããŸããããŒã«ã¯ç䟡ãã¥ãŒã¿ã³ããèªåçã«æ€åºããããšããŸãããæåã§ã®æ€èšŒãå¿ èŠãªå ŽåããããŸãã
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