test driven ruby
TRANSCRIPT
testdrivenr u b y
Yukihiro “Matz” MatsumotoRuby creator
Ruby is...● programming language● dynamic ● open source ● focus on simplicity and productivity ● it has an elegant syntax that is natural to read and easy to write
● appeared in 1995.
● Became popular in 2005. with the apperance of Ruby on Rails (web application framework written in Ruby)
OK, lets see some Ruby code!
NO.
Of course, Ruby wouldn’t be Ruby without tests.
test driven development - tdd
add a test
run all tests and see if the new one fails
write some code
run tests
refactor code
-repeat-
fail
pass
software development methodology:
the TDD circle of life
TEST FAILS
TEST PASSES:“IT’S ALL GREEN”
refactor
refactor
refactor
refactor
refactor
RSpec
TDD framework / test tool for Ruby.
Domain specific language.
Aims to resemble specifications in natural language.
TIME FOR RSPEC SETUP
1. Add RSpec gem (package) to your project
2. Write ‘specs’ (tests / specifications) 3. Run them with rspec
4. Observe the reports of the specs crashing.
5. Proceed with the TDD cycle.
now, we finally switch over to...
examples!
First things first, breakfast.
String breakfast = null;
if (breakfast == null) {
breakfast = "burek";
}
breakfast = nil
if breakfast == nil
breakfast = "burek"
end
String breakfast = null;
if (breakfast == null) {
breakfast = "burek";
}
if breakfast.nil?
breakfast = "burek"
end
String breakfast = null;
if (breakfast == null) {
breakfast = "burek";
}
if !breakfast
breakfast = "burek"
end
String breakfast = null;
if (breakfast == null) {
breakfast = "burek";
}
unless breakfast # unless = if not
breakfast = "burek"
end
String breakfast = null;
if (breakfast == null) {
breakfast = "burek";
}
breakfast = "burek" unless breakfast
String breakfast = null;
if (breakfast == null) {
breakfast = "burek";
}
breakfast ||= "burek"
Pretty neat, huh? There’s more.
public void greetSomeone(String name) {
return "Hello there, " + name;
}
def greet_someone(name)
"Hello there, " + name
end
public void greetSomeone(String name) {
return "Hello there, " + name;
}
def greet_someone(name)
"Hello there, #{name}"
end
Now the loops.
for i in 0..10
puts i
end
for(int i = 0; i < 11; i++) {
System.out.println(i);
}
10.times {|i| puts i}
for(int i = 0; i < 11; i++) {
System.out.println(i);
}
Iterating through an array.
String[] people = {"Bob", "Billy", "Jim"};
int i = 0;
while(i < people.length) {
System.out.println(people[i]);
i++;
}
people = ["Bob", "Billy", "Jim"]
i = 0
while i < people.size
puts people[i]
i += 1
end
String[] people = {"Bob", "Billy", "Jim"};
for(int i = 0; i < people.length; i++) {
System.out.println(people[i]);
}
people = ["Bob", "Billy", "Jim"]
for i in 0..people.size
puts people[i]
end
String[] people = {"Bob", "Billy", "Jim"};
for(String person: people) {
System.out.println(person);
}
people = ["Bob", "Billy", "Jim"]
people.each { |person| puts person }
Lets see if this actually works.
end_presentation unless questions?