Mutation Testing - Voxxed Days Bucharest 10.03.2017
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Mutation testing involves making small changes to code to test how well tests kill mutants, or modified versions of the code. The document discusses running mutation testing on a simple Calculator class with a sum method, generating 1 mutant initially that the test did not kill, then adding a new test that kills the mutant, achieving 100% coverage. It also discusses adding conditions to the sum method, generating more mutants, and the benefits of mutation testing to improve test quality.
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Game Class:
public class Game {
public static void main(String[] args) {
Table table = new Table();
BinBuilder bb = new BinBuilder();
Outcome black = new Outcome(\"Black\", 35);
Bet bet = new Bet(10, black);
table.placeBet(bet);
Bin bin = bb.wheel.get(8);
System.out.println(bin.toString());
System.out.println(table.bets.toString());
System.out.println(black.toString());
ListIterator i = table.bets.listIterator();
Iterator b = bin.outcomes.iterator();
while(i.hasNext()) {
System.out.println(i.next().outcome.name.toString());
while(b.hasNext()){
System.out.println(b.next().name.toString());
if(i.next().outcome.equals(b.next())){
System.out.println(\"Win!\");
}
else{
System.out.println(\"Win :/\");
}
}
}
}
}
Player Class
public class Player {
public Table table;
public Outcome black;
public Bet bet;
public Player(Table table) {
table = new Table();
black = new Outcome(\"Black\", 1);
}
void placeBets() {
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table.placeBet(bet);
}
void win(Bet bet) {
System.out.println(\"You\'ve won: \" + bet.winAmount());
}
void lose(Bet bet) {
System.out.println(\"You lost!\" + bet.loseAmount() + \":/\");
}
}
Outcome class
public class Outcome implements Comparable {
public String name;
public int odds;
public Outcome(String name, int odds){
this.name = name;
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}
public int winAmount(int amount){
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public boolean equals(Outcome other){
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}
public String toString() {
Object[] values= { name, new Integer(odds) };
String msgTempl= \"{0} ({1}:1)\";
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}
@Override
public int compareTo(E arg0) {
if(this.equals(arg0)){
return 0;
}
return 1;
}
}
Table Class
public class Table {
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public LinkedList bets;
public Table() {
bets = new LinkedList();
}
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Wheel Class
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Wheel(NonRandom rng){
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Bin next(){
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Bet Class
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Mutation Testing - Voxxed Days Bucharest 10.03.2017
- 13. $327.6 million
- 25. really?
- 33. return a + b;
- 34. return a + b;
- 36. public class Calculator { public int sum(int a, int b) { return a + b; } }
- 44. return a + b;
- 45. return a - b;
- 48. ●
- 49. ● ●
- 50. ● ● ●
- 51. ● ● ● ●
- 52. return a - b;
- 70. public class Calculator { public int sum(int a, int b) { return a + b; } } @Test public void force100PercentCoverage() { calculator.sum(0, 0); }
- 71. > MathMutator >> Generated 1 Killed 0 (0%) > KILLED 0 SURVIVED 1 > TIMED_OUT 0 NON_VIABLE 0 > MEMORY_ERROR 0 NOT_STARTED 0 > STARTED 0 RUN_ERROR 0 > NO_COVERAGE 0
- 72. @Test public void Should_ReturnSum_When_SummingTwoValues() { // given int a = 1; int b = 2; // when int result = calculator.sum(a, b); // then assertThat(result).isEqualTo(3); }
- 73. > MathMutator >> Generated 1 Killed 1 (100%) > KILLED 1 SURVIVED 0 > TIMED_OUT 0 NON_VIABLE 0 > MEMORY_ERROR 0 NOT_STARTED 0 > STARTED 0 RUN_ERROR 0 > NO_COVERAGE 0
- 76. ● ●
- 82. if (a >= 100) { throw new IllegalArgumentException(); } if (a < 100) { fooBar(); }
- 83. if (a >= 100) { throw new IllegalArgumentException(); } if (a < 100) { fooBar(); }
- 87. return a + b;
- 88. return a + b;
- 89. return a + b; return a - b return 0
- 90. return a + b; return a - b return 0
- 91. :)
- 100. // given
- 101. // given // when
- 102. // given // when
- 106. Jenkins
- 116. Thank you ł