Testing on Rails

Testing on Rails Unit Tests Models Functional Tests Controllers Views Integration Tests Application Fixtures Data to support the Tests

Unit Tests

Models

Functional Tests

Controllers

Views

Integration Tests

Application

Fixtures

Data to support the Tests

Every Application get's tested, eventually. Why Test?

Every Application get's tested, eventually.

Why Automate Tests? We are programmers, right? Computer's are great at performing mundane repeatable tasks. Automated Regression Testing. Refactoring is easier.

We are programmers, right?

Computer's are great at performing mundane repeatable tasks.

Automated Regression Testing.

Refactoring is easier.

Additional Benefits Writing Tests makes better Programmers. Automated Tests make better Applications. Tests are a great warm-up / practice area. With Unit Tests, “...you actually stand a chance of producing a product with close to zero defects.” -The Pragmatic Programmer All the beautiful people write unit tests.

Writing Tests makes better Programmers.

Automated Tests make better Applications.

Tests are a great warm-up / practice area.

With Unit Tests, “...you actually stand a chance of producing a product with close to zero defects.” -The Pragmatic Programmer

All the beautiful people write unit tests.

My Favorite Mistake # Warning: The database defined as 'test' will be erased and # re-generated from your development database when you run 'rake'. # Do not set this db to the same as development or production. test: adapter: mysql database: bathroom_attendant_test username: root password: host: localhost

# Warning: The database defined as 'test' will be erased and

# re-generated from your development database when you run 'rake'.

# Do not set this db to the same as development or production.

test:

adapter: mysql

database: bathroom_attendant_test

username: root

password:

host: localhost

Unit Testing Models Test Calculations Test Validations Test Callbacks

Test Calculations

Test Validations

Test Callbacks

Methods Available assert boolean assert_equal expected, actual assert_raise *args assert_instance_of klass, object assert_nil object assert_valid object

assert boolean

assert_equal expected, actual

assert_raise *args

assert_instance_of klass, object

assert_nil object

assert_valid object

Error vs. Failure config 1) Error: test_truth(AttendantTest): Mysql::Error: #28000Access denied for user 'root'@'localhost' (using password: NO) 1) Failure: test_truth(AttendantTest) [./test/unit/attendant_test.rb:8]: <false> is not true. 2) Error: test_truth(QualificationTest): NameError: undefined local variable or method `duh' for #<QualificationTest:0x2755958> /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/test_process.rb:432:in `method_missing' ./test/unit/qualification_test.rb:8:in `test_truth' 4 tests, 3 assertions, 1 failures, 1 errors rake aborted! Command failed with status (1): [/usr/local/bin/ruby -Ilib:test &quot;/usr/local...] (See full trace by running task with --trace)

config

1) Error:

test_truth(AttendantTest):

Mysql::Error: #28000Access denied for user 'root'@'localhost' (using password: NO)

1) Failure:

test_truth(AttendantTest) [./test/unit/attendant_test.rb:8]:

<false> is not true.

2) Error:

test_truth(QualificationTest):

NameError: undefined local variable or method `duh' for #<QualificationTest:0x2755958>

/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/test_process.rb:432:in `method_missing'

./test/unit/qualification_test.rb:8:in `test_truth'

4 tests, 3 assertions, 1 failures, 1 errors

rake aborted!

Command failed with status (1): [/usr/local/bin/ruby -Ilib:test &quot;/usr/local...]

(See full trace by running task with --trace)

Functional Testing Controllers Testing the Flow of the application

Testing the Flow of the application

The 4 Hashes of The Apocolypse assigns : any objects that are stored as instance variables in actions for use in views cookies : any objects cookies that are set flash : any objects living in the flash session : any object living in session variables

assigns : any objects that are stored as instance variables in actions for use in views

cookies : any objects cookies that are set

flash : any objects living in the flash

session : any object living in session variables

Additional Methods Available get post put delete head assert_response assert_template assert_redirected_to

get

post

put

delete

head

assert_response

assert_template

assert_redirected_to

Functional Testing Views assert_select ( selector , *values, equality?, message?) { |elems| ... } assert_select_rjs assert_select_email selector syntax is the same as the syntax for CSS .

assert_select ( selector , *values, equality?, message?) { |elems| ... }

assert_select_rjs

assert_select_email

selector syntax is the same as

the syntax for CSS .

Integration Testing Testing Across Controllers Testing User Stories

Testing Across Controllers

Testing User Stories

Integration Methods follow_redirect xml_http_request https assert_difference open_session

follow_redirect

xml_http_request

https

assert_difference

open_session

Fixtures YAML files Dynamic Fixtures Loading from Live Data

YAML files

Dynamic Fixtures

Loading from Live Data

Resources Rails Manual http://manuals.rubyonrails.com/read/chapter/28#page72 Integration Tests through 'script/console' http://clarkware.com/cgi/blosxom/2006/04/04#HeadlessApp Assertions Cheat Sheet http://nubyonrails.topfunky.com/articles/2006/08/24/ruby-rails-test-rails-cheat-sheet assert_select Cheat Sheet http://blog.labnotes.org/2006/09/04/assert_select-cheat-sheet/ AWDR 2.0 Testing Chapter http://media.pragprog.com/titles/rails2/Testing.pdf SafetyNet Plugin http://www.martinicity.net/articles/2007/02/07/safety-net Difference between Mocks and Stubs http://martinfowler.com/articles/mocksArentStubs.html

Rails Manual

http://manuals.rubyonrails.com/read/chapter/28#page72

Integration Tests through 'script/console'

http://clarkware.com/cgi/blosxom/2006/04/04#HeadlessApp

Assertions Cheat Sheet

http://nubyonrails.topfunky.com/articles/2006/08/24/ruby-rails-test-rails-cheat-sheet

assert_select Cheat Sheet

http://blog.labnotes.org/2006/09/04/assert_select-cheat-sheet/

AWDR 2.0 Testing Chapter

http://media.pragprog.com/titles/rails2/Testing.pdf

SafetyNet Plugin

http://www.martinicity.net/articles/2007/02/07/safety-net

Difference between Mocks and Stubs

http://martinfowler.com/articles/mocksArentStubs.html