Wie man KI ins Testing bringt

@roesslerj1
Wie man KI ins Testen bringt
Dr. Jeremias Rößler
https://retest.de

@roesslerj4
1 - 2 = ?
• -1 is mathematically correct
• 0 if I don’t want to payback gift certiﬁcates to costumers
• 23 if I’m working with hours
• 59 if I’m working with minutes or seconds
• Something between 27 and 30 if I’m working with days
• 11 if I am working with months
• exception if I am working with degrees Fahrenheit

@roesslerj8
How do you bring AIinto testing?

@roesslerj9
How do YOU do Testing?

@roesslerj10
Testing
Actual wrong
Bug
Comparison Expected vs Actual
Test Execution
Done
No Difference

@roesslerj11
Actual wrong
Bug
Update Expected
Expected wrong
Test Execution
Done
No Difference Difference
Evaluate Difference
Testing

@roesslerj12
When is a bug a bug?
When it’s not a feature!

@roesslerj13
Is it a bug?
.
..
text.c
other.files
for (. . .) {
if (name[0] == '.') continue;
. . .
}
ls

@roesslerj16
What is a bug?
Without speciﬁcation, there are no bugs
— only surprises.
Brian Kernighan
“

@roesslerj17
Why do we test?
After
implementation?
1 + 1 = 3
2 + 2 = 4

@roesslerj21
Why do we test?
After
implementation?
1 + 1 = 3
2 + 2 = 4
After
change?
1 + 1 = 3
1 + 1 = 5

@roesslerj
automated
regression test
≠
test
22

@roesslerj
automated
regression test
=
version control
23

@roesslerj24
Why do we test?
After
implementation?
1 + 1 = 3
2 + 2 = 4
After
change?
1 + 1 = 3
1 + 1 = 5
1 + 1 = 2

@roesslerj25
Actual wrong
Bug
Update Expected
Expected wrong
Test Execution
Done
Evaluate Difference
Testing

@roesslerj26
Actual wrong
Bug
Update Expected
Expected wrong
Test Execution
Done
Evaluate Difference
Manual and Automated Testing
effort
effort

@roesslerj42
https://github.com/retest/recheck-web

@roesslerj43
How do you bring AIinto testing?

@roesslerj47
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.

@roesslerj48
We replace the typewriter with a computer…

@roesslerj49
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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@roesslerj52
- gremlins.js
- NetFlix Chaos Monkey
- UI/Application Exerciser Monkey
Open Source Products

@roesslerj55
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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@roesslerj56
Intelligent Monkey
DEMO

@roesslerj61
Problem Space
Problem
Space

@roesslerj66
train
AI
Artiﬁcial
Neural Net
Genetic
Algorithm
AI

@roesslerj68
test
1.0
approve
1.1
diff
train
user
automate

@roesslerj69
@Test
public void test_login() throws Exception {
final WebDriver driver = new FirefoxDriver();
driver.get( "http://www.retest.de" );
re.check( driver, "launch" );
driver.findElement( By.id( "username" ) ).sendKeys( username );
driver.findElement( By.id( "pwd" ) ).sendKeys( password );
driver.findElement( By.className( "button" ) ).submit();
re.check( driver, "login");
}

@roesslerj
@roesslerjX
https://github.com/retest/recheck-web
@roesslerjX
train
AI
Artiﬁcial
Neural Net
Genetic
Algorithm
AI
70
Summary
Difference Testing
little maintenance
no wasteful testing
yet more complete
Monkey-Testing:
cheaper
faster
better
multiplies manual tests

@roesslerj
roessler@retest.de
@roesslerj
Questions?
https://www.facebook.com/retest.de
http://retest.rocks

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