continuous integration using sparrow tool chain
Sparrow is a tool to automate testing infrastructure. Automated testing
is essential part of continuous integration processes as it provides fast feedback
on cases when something goes wrong.
Consider simple example of how sparrow could be used to build up some basic parts
of your infrastructure.
web application development
We have a simple Dancer2 application we are going to deploy on development environment:
app.psgi
#!/usr/bin/env perl
use Dancer2;
get '/' => sub {
"Hello World!"
};
dance;
Let's keep source code at git repository:
git init
git add app.psgi
git commit -a -m 'my web application'
git remote add origin https://github.com/melezhik/webapp.git
git push -u origin master
development server
We are going to deploy application on dedicated server used for development environment:
ssh dev.server
git clone https://github.com/melezhik/webapp.git
cd webapp
cpanm Dancer2
plackup
In these lines we fetch source code from remote git repository and run dancer application. Good so far.
These steps could be automated in various ways ( jenkins, crontab , whatever your favorite CI tool ).
Last command should emit following:
HTTP::Server::PSGI: Accepting connections at http://0:5000/
Which means our application is running.
building up test harness
As we need to ensure that app is running correctly after being deployed we have to add some integration tests for it.
With sparrow it is as simple as writing a few lines of code:
git init # let's keep test suite case under git
echo 127.0.0.1:5000 > host
nano get.txt
200 OK
Hello World!
echo '{}' > sparrow.json
echo "requires 'swat';" > cpanfile
git add .
git commit -a -m 'basic test suite'
git remote add origin https://github.com/melezhik/webapp-basic-check.git
git push -u origin master
Now when we are done with creating a very simple test suite let's go to development server and create some check points:
ssh dev.server
cpanm Sparrow
echo "basic-check https://github.com/melezhik/webapp-basic-check.git" > ~/sparrow.list
sparrow index update
sparrow plg install basic-check
sparrow project create webapp
sparrow check add webapp basic
sparrow check set webapp basic basic-check
sparrow check run webapp basic
Output of last command will be:
# running cd /home/vagrant/sparrow/plugins/private/basic-check && carton exec 'swat ./ ' ...
/home/vagrant/.swat/.cache/30818/prove/00.GET.t ..
# trying ... curl -X GET -k --connect-timeout 20 -m 20 -L -f -D - '127.0.0.1:5000/'
ok 1 - server returned successful response
ok 2 - output match '200 OK'
ok 3 - output match 'Hello World!'
1..3
ok
All tests successful.
Files=1, Tests=3, 0 wallclock secs ( 0.03 usr 0.00 sys + 0.04 cusr 0.00 csys = 0.07 CPU)
Result: PASS
Ok, we see that our tests succeed and we can continue with development.
adding new feature to web application
Let's add authentication to your application:
app.psgi
#!/usr/bin/env perl
use Dancer2;
use Dancer2::Plugin::Auth::Tiny;
set show_errors => 1;
set session => 'Simple';
get '/' => sub {
"Hello World!"
};
get '/public' => sub { return 'public area' };
get '/private' => needs login => sub { return 'private area' };
get '/login' => sub {
session "user" => "Robin Good";
return "login and to back to " . params->{return_url};
};
get '/logout' => sub {
app->destroy_session;
redirect uri_for('/public');
};
dance;
Let's create a check list we need to ensure:
- when user hits /public route he sees 'public area'
- when user hits /private route for a first time he gets redirected to /login page and then gets a session cookies
- when user hits /private routes for a second time he sees 'private area'
Now create another suite case for the stories above, we are going to keep under another git repository and
then deliver tests as another sparrow plugin as we did with the basic suite case:
creating test suite skeleton
git init
echo 127.0.0.1:5000 > host
echo '{}'> sparrow.json
echo "requires 'swat';" > cpanfile
git add .
git commit -a -m 'authentication test suite'
git remote add origin https://github.com/melezhik/webapp-auth-check.git
git push -u origin master
public area test
mkdir public
nano public/get.txt
200 OK
public area
private area first time
mkdir private-first-time
nano private-first-time/hook.pm
run_swat_module( GET => '/logout' );
run_swat_module( GET => '/private' , { auth => 0 } );
set_response('done');
echo done > private-first-time/get.txt
mkdir logout/
echo swat_module=1 > logout/swat.ini
echo 200 OK > logout/get.txt
mkdir private/
nano private/swat.ini
swat_module=1
curl_params="-b ${test_root_dir}/cook.txt"
nano private/get.txt
generator: [ module_variable('auth') ? 'private area' : 'login and to back to' ]
private area second time
mkdir private-second-time
nano private-second-time/hook.pm
run_swat_module( GET => '/login' );
run_swat_module( GET => '/private' , { auth => 1 } );
set_response('done');
mkdir login/
nano login/swat.ini
swat_module=1
curl_params="-c ${test_root_dir}/cook.txt"
echo 200 OK > login/get.txt
And finally we can commit changes to git and push them to remote.
git add .
git commit -a -m 'authentication check test suite'
git push
testing new features
As we did with basic test suite we now are able to run tests for authentication feature:
ssh dev.server
echo "auth-check https://github.com/melezhik/webapp-auth-check.git" >> ~/sparrow.list
sparrow index update
sparrow plg install auth-check
sparrow check add webapp auth
sparrow check set webapp auth auth-check
sparrow check run webapp auth
The output of the second test suite will be:
# running cd /home/vagrant/sparrow/plugins/private/testapp2 && carton exec 'swat ./ ' ...
/home/vagrant/.swat/.cache/1085/prove/private-first-time/00.GET.t ...
# trying ... curl -X GET -k --connect-timeout 20 -m 20 -L -f -D - '127.0.0.1:5000/logout'
ok 1 - server returned successful response
ok 2 - output match '200 OK'
# trying ... curl -X GET -k --connect-timeout 20 -m 20 -L -b /home/vagrant/.swat/.cache/1085/prove/cook.txt -f -D - '127.0.0.1:5000/private'
ok 3 - server returned successful response
ok 4 - output match 'login and to back to'
ok 5 - server response is spoofed
# response saved to /home/vagrant/.swat/.cache/1085/prove/xDQuPGlVog
ok 6 - output match 'done'
1..6
ok
/home/vagrant/.swat/.cache/1085/prove/public/00.GET.t ...............
# trying ... curl -X GET -k --connect-timeout 20 -m 20 -L -f -D - '127.0.0.1:5000/public'
ok 1 - server returned successful response
ok 2 - output match '200 OK'
ok 3 - output match 'public area'
1..3
ok
/home/vagrant/.swat/.cache/1085/prove/private-second-time/00.GET.t ..
# trying ... curl -X GET -k --connect-timeout 20 -m 20 -L -c /home/vagrant/.swat/.cache/1085/prove/cook.txt -f -D - '127.0.0.1:5000/login'
ok 1 - server returned successful response
ok 2 - output match '200 OK'
# trying ... curl -X GET -k --connect-timeout 20 -m 20 -L -b /home/vagrant/.swat/.cache/1085/prove/cook.txt -f -D - '127.0.0.1:5000/private'
ok 3 - server returned successful response
ok 4 - output match 'private area'
ok 5 - server response is spoofed
# response saved to /home/vagrant/.swat/.cache/1085/prove/hvtwlrTqEZ
ok 6 - output match 'done'
1..6
ok
All tests successful.
Files=3, Tests=15, 0 wallclock secs ( 0.03 usr 0.01 sys + 0.17 cusr 0.01 csys = 0.22 CPU)
Result: PASS
Examining your test infrastructure
Running project show command one may obtain available check points for webapp project. It is handy when eventually a lot test suites come in here.
sparrow project show webapp
[project webapp]
[checkpoints]
auth
basic
Summary
Sparrow tool chains has following features:
integration tests suites are decoupled from application code
tests could be grouped by types/environments and developed/delivered as dedicated test suites - aka sparrow plugins
sparrow test infrastructure is easy to bootstrap on different environments (dev,test,prod) - everybody involved
is able now to run desired test suite with easiness
swat output is intended to simplify debugging/troubleshooting process, in most cases you just rerun curl command ( against tested server )
with parameters extracted from test output.
PS
paper source code
the source code for this post could be found here
code examples :
Dev & Devops
---
Then I beheld all the work of God, that a man cannot find out the work that is done under the sun: because though a man labour to seek it out, yet he shall not find it; yea further; though a wise man think to know it, yet shall he not be able to find it.
(Ecclesiastes 8:17)