testing in rails 3.x

Test Automation with RoR for dummies

Aug, 2011Eran Nelinger, SAP Labseran.nelinger@sap.com

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Why Test Automation

Rails Testing Theory

Deep dive into ‘Test’ directory

Other automation investment tips

04/12/2023

Why Test Automation

Rails Testing Theory

Deep dive into ‘Test’ directory

Other automation investment tips

04/12/2023

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Life’s too short for manual testing…

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Rails make it super-easy for us to write tests (Almost everything we need is already in place with scaffolding)Machine can better remember expected output

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Why Test Automation

Rails Testing Theory

Deep dive into ‘Test’ directory

Other automation investment tips

04/12/2023

Rails applications typically interacts heavily with databasesIf we would like to write efficient tests, they’ll need to interact with databases

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We would like to be able to run our test in such environment where messing our data does not really make a differenceOn the other hand we want to rebuild our data each time before a test run

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The Three Environments approach allows us to set up and interact with test data without any danger of your tests altering data from your production environment

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test/fixtures:•Just a fancy word for ‘sample-data’•Populate our test-schema with content each time before a test runs•Database independent• Supports YAML as well as CSV

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test/unit:•Unit-tests in rails are model-tests•Logical assertions of our application’s business logic•Should include at list one test method for every method in the model

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test/unit/helpers:•Any method that might be used in more then one test-case

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test/unit/test_helper.rb:•Define ActiveSupport::TestCase class which is the base class for each test (not only unit)•Requires by each of the test files•Switch to RAILS_ENV = “test”•Brings us assertions from test test/unit

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test/functional•ActionController::TestCase•Controller specific tests was the web request successful? was the user redirected to the

right page? was the user successfully

authenticated? was the correct object stored in

the response template? was the appropriate message

displayed to the user in the view?

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test/integration•ActionController::IntegrationTest•Interaction among number of controllers•Generally used to test important flows•Fixtures -> to be included explicitly

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test/performance•ActionDispatch::PerformanceTest•Runs a code profiler of each test method•Flat and graph_html output is written by defauls

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Before running the tests:1. $ rake db:migrate

runs any pending migrations on the development environment and updatesdb/schema.rb

2. $ rake db:test:loadrecreates the test database

from the current db/schema.rb

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Assertions are the working bees of testingActually performs a check to see if expected==actual

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Assertions are the working bees of testingActually performs a check to see if expected==actual

Assertion Purpose

assert( boolean, [msg] ) Ensures that the object/expression is true.

assert_equal( obj1, obj2, [msg] ) Ensures that obj1 == obj2 is true.

assert_not_equal( obj1, obj2, [msg] ) Ensures that obj1 == obj2 is false.

assert_same( obj1, obj2, [msg] ) Ensures that obj1.equal?(obj2) is true.

assert_not_same( obj1, obj2, [msg] ) Ensures that obj1.equal?(obj2) is false.

assert_nil( obj, [msg] ) Ensures that obj.nil? is true.assert_not_nil( obj, [msg] ) Ensures that obj.nil? is false.

assert_match( regexp, string, [msg] ) Ensures that a string matches the regular expression.

assert_no_match( regexp, string, [msg] ) Ensures that a string doesn’t matches the regular expression.

assert_in_delta( expecting, actual, delta, [msg] ) Ensures that the numbers expecting and actual

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Rails specific assertions

Assertion Purpose

assert_valid(record) Ensures that the passed record is valid by Active Record standards and returns any error messages if it is not.

assert_difference(expressions, difference = 1, message = nil) {...}

Test numeric difference between the return value of an expression as a result of what is evaluated in the yielded block.

assert_no_difference(expressions, message = nil, &block) Asserts that the numeric result of evaluating an expression is not changed before and after invoking the passed in block.

assert_response(type, message = nil)Asserts that the response comes with a specific status code. You can specify :success to indicate 200, :redirect to indicate 300-399, :missing to indicate 404, or :error to match the 500-599 range

assert_redirected_to(options = {}, message=nil)

Assert that the redirection options passed in match those of the redirect called in the latest action. This match can be partial, such thatassert_redirected_to(:controller => "weblog")will also match the redirection ofredirect_to(:controller => "weblog", :action => "show") and so on.

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Why Test Automation

Rails Testing Theory

Deep dive into ‘Test’ directory (Model testing)

Other automation investment tips

04/12/2023

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Why Test Automation

Rails Testing Theory

Deep dive into ‘Test’ directory (Controller testing)

Other automation investment tips

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Why Test Automation

Rails Testing Theory

Deep dive into ‘Test’ directory (View testing)

Other automation investment tips

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http://guides.rubyonrails.org/testing.htmlhttp://guides.rubyonrails.org/http://ruby-doc.org/stdlib/libdoc/test/unit/rdoc/classes/Test/Unit.htmlhttp://ruby-doc.org/stdlib/libdoc/test/unit/rdoc/classes/Test/Unit/Assertions.htmlhttp://api.rubyonrails.org/classes/ActiveSupport/TestCase.htmlhttp://api.rubyonrails.org/classes/ActionController/TestCase.htmlhttp://rdoc.info/github/rails/rails/master/ActionDispatch/IntegrationTesthttp://watir.com/http://pivotal.github.com/jasmine/http://railscasts.com/episodes/261-testing-javascript-with-jasmine

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