1. Testing Zen
Improve software quality
and one's quality of life
with fuzz tests, code coverage,
and a fast in-memory database.
Thomas Müller
Day Software AG
Presentation 6640
12. 4
Why Automated Tests?
1. Less Bugs
2. Can Refactor
3. Nice Code
4. Nice to Work
5. Tests are Samples & Docs
13. 4
Why Automated Tests?
1. Less Bugs
2. Can Refactor
3. Nice Code
4. Nice to Work
5. Tests are Samples & Docs
6. Short Release Cycle
14. 4
Why Automated Tests?
1. Less Bugs
2. Can Refactor
3. Nice Code
4. Nice to Work
5. Tests are Samples & Docs
6. Short Release Cycle
7. Less/No Branching
15. 4
Why Automated Tests?
1. Less Bugs
2. Can Refactor
3. Nice Code
4. Nice to Work
5. Tests are Samples & Docs
6. Short Release Cycle
7. Less/No Branching
8. Predictable Work
16. 4
Why Automated Tests?
1. Less Bugs
2. Can Refactor
3. Nice Code
4. Nice to Work
5. Tests are Samples & Docs
6. Short Release Cycle
7. Less/No Branching
8. Predictable Work
9. Go Home Early
17. 4
Why Automated Tests?
1. Less Bugs
2. Can Refactor
3. Nice Code
4. Nice to Work
5. Tests are Samples & Docs
6. Short Release Cycle
7. Less/No Branching
8. Predictable Work
9. Go Home Early
10. Beer!
24. 8
Fuzz Testing Example
interface DataService {
void create(int k, String v);
String read(int k);
void delete(int k);
}
byte[] b = new byte[100];
random.nextBytes(b);
data = new String(b,
"ISO-8859-1");
25. 8
Fuzz Testing Example
interface DataService { Random r = new Random(123);
void create(int k, String v); for (int i = 0; i < 10000; i++) {
String read(int k); int k = r.nextInt(100);
void delete(int k); switch (r.nextInt(3)) {
} case 0:
ds.create(k, randomString(r));
break;
case 1:
ds.read(k);
byte[] b = new byte[100]; break;
random.nextBytes(b); case 2:
data = new String(b, ds.delete(k);
"ISO-8859-1"); break;
}
}
