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Diffstat (limited to 'guides/source/testing.md')
| -rw-r--r-- | guides/source/testing.md | 45 |
1 files changed, 30 insertions, 15 deletions
diff --git a/guides/source/testing.md b/guides/source/testing.md index 7abf3af187..bf310cf2db 100644 --- a/guides/source/testing.md +++ b/guides/source/testing.md @@ -1,7 +1,7 @@ **DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON http://guides.rubyonrails.org.** -A Guide to Testing Rails Applications -===================================== +Testing Rails Applications +========================== This guide covers built-in mechanisms in Rails for testing your application. @@ -18,7 +18,7 @@ Why Write Tests for your Rails Applications? Rails makes it super easy to write your tests. It starts by producing skeleton test code while you are creating your models and controllers. -By simply running your Rails tests you can ensure your code adheres to the desired functionality even after some major code refactoring. +By running your Rails tests you can ensure your code adheres to the desired functionality even after some major code refactoring. Rails tests can also simulate browser requests and thus you can test your application's response without having to test it through your browser. @@ -273,7 +273,7 @@ When a test fails you are presented with the corresponding backtrace. By default Rails filters that backtrace and will only print lines relevant to your application. This eliminates the framework noise and helps to focus on your code. However there are situations when you want to see the full -backtrace. Simply set the `-b` (or `--backtrace`) argument to enable this behavior: +backtrace. Set the `-b` (or `--backtrace`) argument to enable this behavior: ```bash $ bin/rails test -b test/models/article_test.rb @@ -319,6 +319,8 @@ specify to make your test failure messages clearer. | `assert_not_includes( collection, obj, [msg] )` | Ensures that `obj` is not in `collection`.| | `assert_in_delta( expected, actual, [delta], [msg] )` | Ensures that the numbers `expected` and `actual` are within `delta` of each other.| | `assert_not_in_delta( expected, actual, [delta], [msg] )` | Ensures that the numbers `expected` and `actual` are not within `delta` of each other.| +| `assert_in_epsilon ( expected, actual, [epsilon], [msg] )` | Ensures that the numbers `expected` and `actual` have a relative error less than `epsilon`.| +| `assert_not_in_epsilon ( expected, actual, [epsilon], [msg] )` | Ensures that the numbers `expected` and `actual` don't have a relative error less than `epsilon`.| | `assert_throws( symbol, [msg] ) { block }` | Ensures that the given block throws the symbol.| | `assert_raises( exception1, exception2, ... ) { block }` | Ensures that the given block raises one of the given exceptions.| | `assert_instance_of( class, obj, [msg] )` | Ensures that `obj` is an instance of `class`.| @@ -367,9 +369,10 @@ All the basic assertions such as `assert_equal` defined in `Minitest::Assertions * [`ActiveSupport::TestCase`](http://api.rubyonrails.org/classes/ActiveSupport/TestCase.html) * [`ActionMailer::TestCase`](http://api.rubyonrails.org/classes/ActionMailer/TestCase.html) * [`ActionView::TestCase`](http://api.rubyonrails.org/classes/ActionView/TestCase.html) -* [`ActionDispatch::IntegrationTest`](http://api.rubyonrails.org/classes/ActionDispatch/IntegrationTest.html) * [`ActiveJob::TestCase`](http://api.rubyonrails.org/classes/ActiveJob/TestCase.html) +* [`ActionDispatch::IntegrationTest`](http://api.rubyonrails.org/classes/ActionDispatch/IntegrationTest.html) * [`ActionDispatch::SystemTestCase`](http://api.rubyonrails.org/classes/ActionDispatch/SystemTestCase.html) +* [`Rails::Generators::TestCase`](http://api.rubyonrails.org/classes/Rails/Generators/TestCase.html) Each of these classes include `Minitest::Assertions`, allowing us to use all of the basic assertions in our tests. @@ -451,7 +454,8 @@ You can run multiple files and directories at the same time: By default test failures and errors are reported inline during a run. Rails options: - -e, --environment ENV Run tests in the ENV environment + -w, --warnings Run with Ruby warnings enabled + -e, --environment Run tests in the ENV environment -b, --backtrace Show the complete backtrace -d, --defer-output Output test failures and errors after the test run -f, --fail-fast Abort test run on first failure or error @@ -516,7 +520,7 @@ steve: Each fixture is given a name followed by an indented list of colon-separated key/value pairs. Records are typically separated by a blank line. You can place comments in a fixture file by using the # character in the first column. -If you are working with [associations](/association_basics.html), you can simply +If you are working with [associations](/association_basics.html), you can define a reference node between two different fixtures. Here's an example with a `belongs_to`/`has_many` association: @@ -614,7 +618,7 @@ $ bin/rails generate system_test users create test/system/users_test.rb ``` -Here's what a freshly-generated system test looks like: +Here's what a freshly generated system test looks like: ```ruby require "application_system_test_case" @@ -641,9 +645,9 @@ When you generate a new application or scaffold, an `application_system_test_cas is created in the test directory. This is where all the configuration for your system tests should live. -If you want to change the default settings you can simply change what the system +If you want to change the default settings you can change what the system tests are "driven by". Say you want to change the driver from Selenium to -Poltergeist. First add the `poltergeist` gem to your Gemfile. Then in your +Poltergeist. First add the `poltergeist` gem to your `Gemfile`. Then in your `application_system_test_case.rb` file do the following: ```ruby @@ -669,6 +673,17 @@ class ApplicationSystemTestCase < ActionDispatch::SystemTestCase end ``` +If you want to use a headless browser, you could use Headless Chrome or Headless Firefox by adding +`headless_chrome` or `headless_firefox` in the `:using` argument. + +```ruby +require "test_helper" + +class ApplicationSystemTestCase < ActionDispatch::SystemTestCase + driven_by :selenium, using: :headless_chrome +end +``` + If your Capybara configuration requires more setup than provided by Rails, this additional configuration could be added into the `application_system_test_case.rb` file. @@ -788,7 +803,7 @@ $ bin/rails generate integration_test user_flows create test/integration/user_flows_test.rb ``` -Here's what a freshly-generated integration test looks like: +Here's what a freshly generated integration test looks like: ```ruby require 'test_helper' @@ -926,7 +941,7 @@ each of the seven default actions, you can use the following command: $ bin/rails generate test_unit:scaffold article ... invoke test_unit -create test/controllers/articles_controller_test.rb +create test/controllers/articles_controller_test.rb ... ``` @@ -1062,9 +1077,9 @@ end ### Setting Headers and CGI variables -[HTTP headers](http://tools.ietf.org/search/rfc2616#section-5.3) +[HTTP headers](https://tools.ietf.org/search/rfc2616#section-5.3) and -[CGI variables](http://tools.ietf.org/search/rfc3875#section-4.1) +[CGI variables](https://tools.ietf.org/search/rfc3875#section-4.1) can be passed as headers: ```ruby @@ -1511,7 +1526,7 @@ class BillingJobTest < ActiveJob::TestCase end ``` -This test is pretty simple and only asserts that the job get the work done +This test is pretty simple and only asserts that the job got the work done as expected. By default, `ActiveJob::TestCase` will set the queue adapter to `:test` so that |