The document contains a series of nonsensical symbols and text fragments with no clear meaning. It includes programming language keywords and testing concepts like properties, mocking, concurrency, and metrics but does not form coherent sentences.

1. T O
f
Rb W r Joseph Wilk

2. W ’
R b fr ?

3. Sr ...
N R b .
R .

4. “The number of languages you know
corresponds to your programming
skill”
S

5. Y ... T
JUnit ScrewUnit
Rspec JBehave
PHPSpec Jasmine
JSpec Cucumber
Circumspec BlahSpec
SomethingSpec WhateverSpec

6. Y ... T
JUnit ScrewUnit
Rspec BORING!
JBehave
PHPSpec Jasmine
JSpec Cucumber
Circumspec BlahSpec
SomethingSpec WhateverSpec

7. T &M
Ruby
Monkey.stub!(:new).and_return(mock("monkey"))
Java
I owe you one Java mocking example.
I don’t have the will power to write it.
Sorry.

8. T &M
Ruby
BORING!
Monkey.stub!(:new).and_return(mock("monkey"))
Java
I owe you one Java mocking example.
I don’t have the will power to write it.
Sorry.

9. I r
Asynchronous Property testing
Permutation Model testing
explosions
Metrics Test feedback
Graphical tests

10. H
Curry

11. “Program testing can be used to show the
presence of bugs, but never to show their
absence!”
Edsger Dijkstra

12. Q C
Properties
For all values of s the length of the thing
returned by five_random_characters is 5

13. Q C
Properties
QuickCheck
Randomly
Logic generate Function
tests

14. Q C
Properties
QuickCheck
Randomly
Logic generate Function
tests

15. Q C
Properties
QuickCheck
Randomly
Logic generate Function
tests

16. Q C
Properties
QuickCheck
Randomly
Logic generate Function
tests

17. Q C
Properties
QuickCheck
Randomly
Logic generate Function
tests
Counter
Examples

18. Q C
Properties
it "should reverse a string" do
"monkeys".reverse.reverse.should == "monkeys"
end
100.times.map {“#{rand(10)}#{rand(10)}”}.each do |char|
it "should reverse a string" do
char.reverse.reverse.should == char
end
end

19. Q C
Properties
import Data.Char
import Test.QuickCheck
instance Arbitrary Char where
arbitrary = choose ('32', '128')
coarbitrary c = variant (ord c `rem` 4)
prop_RevRev xs = reverse (reverse xs) == xs
where types = xs::[Char]
$ Main> quickCheck prop_RevRev
OK, passed 100 tests.

20. Er
Messaging/
Concurrency

21. M Er Models
Erlang McErlang
runtime runtime
system system
communication
concurrency
distribution

22. M Er Models
message Messenger
“Scottish
“Scottish Service
fiction”
fiction”
Message login login Message
client client
Fred Clara

23. M Er Models
if user1 does not send a message m to user2 until user2 is logged on,
then
if user1 does send a message m to user2
then
eventually user2 receives the message m.
"not P until Q => (eventually P => eventually R)”
P: clara sends message “Scottish fiction” to fred
Q: fred is logged on
R: fred receives the message “Scottish fiction” from clara

24. M Er Models
{program={scenario,start,[[
[{logon,clara},{message,fred,"hi"},logoff],
[{logon,fred},logoff]]]},
monitor={mce_ltl_parse:ltl_string2module_and_load
("not P until Q implies (eventually P implies
eventually R)", messenger_mon),
{void,[{'P',basicPredicates:message_to
(clara,fred,"hi")},
{'Q',basicPredicates:logon(fred)},
{'R',basicPredicates:message_received
(fred,clara,"hi")}]}},
algorithm={mce_alg_buechi,void}}).

25. “Every method you use to prevent or find
bugs leaves a residue of subtler bugs against
which those methods are ineffectual
Pesticide Paradox / Beizer

26. C r
Bracket
hell

27. M
Facts
(fact
(alive-in-next-generation? ...cell...) => truthy
(provided
(alive? ...cell...) => false
(neighbor-count ...cell...) => 3))
cell = mock("a cell")
cell.stub(:alive?).and_return(false)
cell.stub(:neighbour_count).and_return(3)
cell.alive_in_next_generation.should == true

28. I
Brief visit

29. I
Specs are documentation

30. I
Specs are documentation

31. J v S rp
Without
the Java

32. Z b .
Trapped inside a browser

33. Z b .
Trapped inside a browser
var zombie = require("zombie");
var assert = require("assert");
zombie.visit("http://localhost:3000/",
function (err, browser, status) {
browser.
fill("email", "zombie@underworld.dead").
pressButton("Sign Me Up!",
function(err, browser, status) {
assert.equal(browser.text("title"), "Welcome");
})
});

34. V w
Topics
{ topic: function () { return 42 },
'should be a number': function (topic) {
assert.isNumber (topic);
},
'should be equal to 42': function (topic) {
assert.equal (topic, 42);
}
}

35. V w
Asynchronous calls
{ topic: function () {
fs.stat('~/FILE', this.callback);
},
'can be accessed': function (err, stat) {
assert.isNull (err); // We have no error
assert.isObject (stat); // We have a stat object
},
'is not empty': function (err, stat) {
assert.isNotZero (stat.size); // The file size is > 0
}
}

36. V w
Promises / Futures
{ topic: function () {
var promise = new(events.EventEmitter);
fs.stat('~/FILE', function (e, res) {
if (e) { promise.emit('error', e) }
else { promise.emit('success', res) }
});
return promise;
},
'can be accessed': function (err, stat) {
assert.isNull (err); //We have no error
assert.isObject (stat); //We have a stat object
},
'is not empty': function (err, stat) {
assert.isNotZero (stat.size); //The file size is > 0
}
}

37. V w
Parallel Execution
{ '/dev/stdout': {
topic: function () { path.exists('/dev/stdout',this.callback) },
'exists': function (result) { assert.isTrue(result) }
},
'/dev/tty': {
topic: function () { path.exists('/dev/tty',this.callback) },
'exists': function (result) { assert.isTrue(result) }
},
'/dev/null': {
topic: function () { path.exists('/dev/null',this.callback) },
'exists': function (result) { assert.isTrue(result) }
}
}

38. T Sw r
Permutation Explosion

39. T Sw r
Permutation Explosion

40. J v
Really

41. J M
Faster Test feedback
Failures are not
randomly distributed
Lots of very short tests
A few very long ones
Kent Beck

42. J M
Faster Test feedback

43. I r L
Learn from Metrics

44. O r ff
dessert

45. ‘‘What is the use of a book,’’ thought Alice,
‘‘without pictures or conversations?’’
Lewis Carroll
Alice’s Adventures in Wonderland

46. Sw L
Words are not enough
Ward Cunningham

47. http://vimeo.com/22165070
Ward Cunningham

48. Gr p T
Brian Marick

49. ‘‘How much do you know about the
heuristics of failure?’
Joseph Wilk
Scotland Ruby Conf 2011
http://testobsessed.com/wp-content/uploads/2007/02/testheuristicscheatsheetv1.pdf

50. T I

51. Joseph Wilk
!
@josephwilk
http://blog.josephwilk.net