No, it is not necessarily a bug. The code is skipping file names that start with a period, which is common for hidden or system files in some operating systems. Without more context on the intended behavior, this alone does not indicate a bug.

1. Tested by Monkeys
The end of banana software!
Dr. Jeremias Rößler Founder ReTest

2. 2

3. 3
Hello!

4. 4
Bug

5. 5
Change
Bug

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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Change
Bug
Test

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SURVEY

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Who has ever tested manually?
SURVEY

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Who has ever regression-tested manually?
Who has ever tested manually?
SURVEY

23. 23
Who has ever regression-tested manually?
Who has ever tested manually?
Who liked it?
SURVEY

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SURVEY
Why didn’t you automate regression testing?

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Mehr-Aufwand
Zeit
Einsparung
Time
Additional
Effort
Saved Effort

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AUTOMATION
Maintenance effort
Risk
Test Coverage

27. 27
Problem:
- high testing effort
- high test automation effort

28. 28
Infinite-Monkey-Theorem:
A monkey hitting keys at random on a typewriter
for a long enough time
will type the complete works of William Shakespeare.

29. 29
We replace the typewriter with a computer…

30. Infinite Monkey
30
public static void main(String... args) throws Exception {
Robot robot = new Robot();
while (true) {
robot.mouseMove(random.nextInt(maxX), random.nextInt(maxY));
robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
robot.delay(200);
for (char inputChar : randomString().toCharArray()) {
robot.keyPress((int) inputChar);
robot.keyRelease((int) inputChar);
robot.delay(10);
}
robot.keyPress(KeyEvent.VK_ENTER);
robot.keyRelease(KeyEvent.VK_ENTER);
}
}
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31. Infinite Monkey
31
DEMO

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35. Intelligent Monkey
35
public static void main(String... args) throws Exception {
WebDriver driver = new FirefoxDriver();
driver.get("http://www.retest.de");
while (true) {
List<WebElement> links = driver.findElements(By.tagName("a"));
links.get(random.nextInt(links.size())).click();
Thread.sleep(500);
List<WebElement> fields =
driver.findElements(By.xpath("//input[@type='text']"));
WebElement field = fields.get(random.nextInt(fields.size()));
field.sendKeys(randomString());
Thread.sleep(500);
}
}
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36. 36
Intelligent Monkey
DEMO

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38. Intelligent Monkey
38

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- gremlins.js
- NetFlix Chaos Monkey
- UI/Application Exerciser Monkey
Open Source Products

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- quick and easy to implement
- finds bugs
Traditional monkey testing
but:
- relevant bugs?
- not intelligent
- not trainable
- needs sandboxing

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Intelligent Monkey
?

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Problem space
Problem
space

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- bases on realistic use case
- covers corner cases
- what about coverage?
Trainable monkey testing

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50. 50
Several searches in parallel

51. 51Source: https://www.youtube.com/watch?v=yJpLUP93pRo

52. 52Source: http://cnx.org/content/m47304/latest/
© Robert Bear and David Rintoul

53. 53
Gen
Exon
Intron
Exon

54. Tower of Hanoi
54
© André Karwath aka Aka
Source: http://en.wikipedia.org/wiki/File:Tower_of_Hanoi_4.gif

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Tower of Hanoi
Possibilities
63
>2

56. 56
9.223.372.036.854.775.808
Tower of Hanoi
Possibilities

57. 57
Tower of Hanoi
Possibilities
292.471.208 Years

58. 58
Genetic Algorithm
efficiency
baseline: 150 mio. years
with GA: 66 seconds

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- bases on realistic use case
- optimises for coverage
- very effective
intelligent monkey testing

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How do you bring AIinto testing?

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AI in Testautomation is a hype.
Wolfgang Platz,
Founder & CPO of Tricentis
“

63. 63
AI in Testing?
– so far I do not see anyone doing it
in a useful way.
Antony Edwards,
CTO of TestPlant
“

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Which bugs can the monkey find?

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Oracle Problem

67. 67
When is a bug a bug?
When it’s not a feature!

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What is a bug?
Without specification, there are no bugs
— only surprises.
Brian Kernighan
“

69. 69
Why do we test?
After
implementation?
1 + 1 = 3
2 + 2 = 4

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73. 73
Why do we test?
After
implementation?
1 + 1 = 3
2 + 2 = 4
After
change?
1 + 1 = 3
1 + 1 = 5

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regression-test
!=
test

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regression-test
==
version control

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- oracle problems hinders AI
- regression testing needs no oracle
- VCS for the GUI
functional monkey testing

81. 81
Intelligenter Affe
Summary
Monkey-Testing:
cheaper
faster
better
multiplies manual tests
Difference Testing
little maintenance
no wasteful testing
yet more complete

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83. 83
Coming 2017Mobile Web

84. 84
https://retest.rocks
@ReTest_en

85. @roesslerj
Dr. Jeremias Rößler Founder ReTest
Questions?
https://www.facebook.com/retest.de
https://retest.rocksroessler@retest.de

86. 86
1. if (name[0] == '.') continue;
Is it a bug?
.
..
text.c
other.files

87. 87
Is it a bug?

88. 88
Is it a bug?