From: Brian Candler <lists@...>
Date: 2012-08-12T19:12:29+09:00
Subject: Re: Using Test::Unit::Testcase for multiple execution

Gerrit Leder wrote in post #1071964:
> Hello all,
>
> I have written a Testcase based upon Test::Unit::Testcase and want to
> execute it repeatedly, say 10.times
>
> But the testcase is not executed multiple times, when loaded subsequent
> times with "load".
> I tried "Thread", "Proc", "require", "load" and similar to execute the
> testcase, but it is always running only once.
>
> How can I execute a testcase with the same name in a loop or something?
>
> Thanks
> Gerrit

1. Make the test itself run ten times

def test_foo
  10.times { ... }
end

2. Call the test runner ten times

To do this, don't rely on the default behaviour. That is: when you 
require 'test/unit', it finds all class objects derived from 
Test::Unit::TestCase and runs them once.

Notice the following code at the end of test/unit.rb (this may be 
installed somewhere like /usr/lib/ruby/1.8/test/unit.rb)

at_exit do
  unless $! || Test::Unit.run?
    Kernel.exit Test::Unit::AutoRunner.run
  end
end

So now you can see how it works, you can run the test suite 10 times:

----8<----
require 'test/unit/testcase'
require 'test/unit/autorunner'

class TestFoo < Test::Unit::TestCase
  def test_foo
    assert true
  end
end

10.times { Test::Unit::AutoRunner.run }
----8<----

3. However, running the suite 10 times is not exactly the same as 
running one suite with each test invoked 10 times.

To do that, you probably want to make a variation on 
Test::Unit::TestSuite or Test::Unit::TestCase which runs each test 10 
times. Looking through the code, it's clear that there's a 'run' method 
on both TestSuite and TestCase, and since you subclass TestCase already 
there's no need for monkey-patching the underlying class.

----8<----
require 'test/unit'

class TestFoo < Test::Unit::TestCase
  alias :orig_run :run
  def run(*args,&blk)
    10.times { orig_run(*args,&blk) }
  end

  def test_foo
    assert true
  end
end
----8<----

$ ruby ert.rb
Loaded suite ert
Started
..........
Finished in 0.000861 seconds.

10 tests, 10 assertions, 0 failures, 0 errors

HTH,

Brian.

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