[wtr-general] Re: Retaining variables between tests in a thread-safe manner
If you use only IE, try replacing following
Watir::IE.new
with
Watir::IE.new_process
Michael
- Original Message
From: Justin Ko
To: Watir General
Sent: Thursday, February 5, 2009 4:11:24 AM
Subject: [wtr-general] Retaining variables between tests in a thread-safe manner
We are creating a smoke test for our web based application using the
Test/Unit module in Ruby (v1.8.6) with Watir (v1.6.2).
The smoke test would consist of a series of tests such as:
Test 1: Open an IE browser and goto to the application's home page
Test 2: Sign into the application
Test 3: Test some feature that is accessible to the signed in user
Test 4: Test some other feature that is accessible to the signed in
user
We would like to:
1) Use the same browser (Watir::IE object) throughout the entire
series of tests and
2) Be able to run the smoke test multiple times concurrently.
In trying to do this, we are running into problems with variable
scope.
When we assigned the Watir::IE object to an instance variable (@), the
variable appeared to be destroyed during the teardown of each test.
This prevents us from re-using the same browser across multiple tests.
When we assigned the Watir::IE object to a class (@@) or global ($)
variable, we could use the same browser throughout the series of
tests. However, when using multiple threads to run the smoke test
multiple times concurrently, the threads collided due to everyone
using the same browser.
The below code illustrates our problem.
If you run the code as it is, two browsers will be opened and all of
the .goto() commands end up being performed on the last created
browser (ie both threads are sharing one browser). If you change the
'@@browser' to '@browser', the test_open_browser test completes as
expected (ie two browsers open and each navigates to a page).
However, the browser is not retained from test to test, resulting in
the test_navigate_somewhere_else test giving the following error:
test_navigate_somewhere_else(TC_MyTest):
NoMethodError: undefined method `goto' for nil:NilClass
caller.rb:16:in `test_navigate_somewhere_else'
Question: Are there any ideas on how we can retain a variable (the
browser) between tests, yet still be thread-safe?
Thanks,
Justin Ko
Code:
require 'watir'
require 'watir/ie'
require 'test/unit'
require 'test/unit/ui/console/testrunner'
class TC_MyTest < Test::Unit::TestCase
def test_open_browser
pages = ['www.google.ca', 'www.bestbuy.ca', 'www.futureshop.ca']
@@browser = Watir::IE.new
sleep(2+rand(10))
@@browser.goto( pages[rand(pages.length)] )
end
def test_navigate_somewhere_else
pages = ['www.henrys.com', 'www.gmail.com', 'maps.google.ca']
@@browser.goto( pages[rand(pages.length)] )
end
end
class TS_MyTests
def self.suite
suite = Test::Unit::TestSuite.new
suite << TC_MyTest.suite
return suite
end
end
threads = []
2.times do |x|
threads << Thread.new(x) { |myPage|
Test::Unit::UI::Console::TestRunner.run(TS_MyTests)
}
end
threads.each { |aThread| aThread.join }
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[wtr-general] Re: Retaining variables between tests in a thread-safe manner
You could use a Singleton or pass your browser object around as a parameter.
Aidy
2009/2/5 Justin Ko :
>
> We are creating a smoke test for our web based application using the
> Test/Unit module in Ruby (v1.8.6) with Watir (v1.6.2).
>
> The smoke test would consist of a series of tests such as:
>
> Test 1: Open an IE browser and goto to the application's home page
> Test 2: Sign into the application
> Test 3: Test some feature that is accessible to the signed in user
> Test 4: Test some other feature that is accessible to the signed in
> user
>
> We would like to:
> 1) Use the same browser (Watir::IE object) throughout the entire
> series of tests and
> 2) Be able to run the smoke test multiple times concurrently.
>
> In trying to do this, we are running into problems with variable
> scope.
>
> When we assigned the Watir::IE object to an instance variable (@), the
> variable appeared to be destroyed during the teardown of each test.
> This prevents us from re-using the same browser across multiple tests.
>
> When we assigned the Watir::IE object to a class (@@) or global ($)
> variable, we could use the same browser throughout the series of
> tests. However, when using multiple threads to run the smoke test
> multiple times concurrently, the threads collided due to everyone
> using the same browser.
>
> The below code illustrates our problem.
>
> If you run the code as it is, two browsers will be opened and all of
> the .goto() commands end up being performed on the last created
> browser (ie both threads are sharing one browser). If you change the
> '@@browser' to '@browser', the test_open_browser test completes as
> expected (ie two browsers open and each navigates to a page).
> However, the browser is not retained from test to test, resulting in
> the test_navigate_somewhere_else test giving the following error:
>
> test_navigate_somewhere_else(TC_MyTest):
> NoMethodError: undefined method `goto' for nil:NilClass
>caller.rb:16:in `test_navigate_somewhere_else'
>
>
> Question: Are there any ideas on how we can retain a variable (the
> browser) between tests, yet still be thread-safe?
>
> Thanks,
> Justin Ko
>
>
> Code:
>
> require 'watir'
> require 'watir/ie'
> require 'test/unit'
> require 'test/unit/ui/console/testrunner'
>
> class TC_MyTest < Test::Unit::TestCase
> def test_open_browser
>pages = ['www.google.ca', 'www.bestbuy.ca', 'www.futureshop.ca']
>@@browser = Watir::IE.new
>sleep(2+rand(10))
>@@browser.goto( pages[rand(pages.length)] )
> end
>
> def test_navigate_somewhere_else
>pages = ['www.henrys.com', 'www.gmail.com', 'maps.google.ca']
>@@browser.goto( pages[rand(pages.length)] )
> end
> end
>
> class TS_MyTests
> def self.suite
>suite = Test::Unit::TestSuite.new
>suite << TC_MyTest.suite
>return suite
> end
> end
>
> threads = []
>
> 2.times do |x|
> threads << Thread.new(x) { |myPage|
>Test::Unit::UI::Console::TestRunner.run(TS_MyTests)
> }
> end
> threads.each { |aThread| aThread.join }
> >
>
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