Oscon Talk

• http:talk.cgi -- to view this talk as slides (double click to advance)
• http://conferences.oreil ... view/e_sess/4074

Fit for XP and Open Source

• WardCunningham
• BrianIngerson

Outline

• Fit in Test-Driven Development
• Demo of Fit with Word and Wiki
• Integrating Fit and Open Source

Start with a Story

For the purpose of sharing unpaid interest of some bonds, compute elapsed days assuming every month has 30 days and every year 360 days.

Add an Example

For example, treat Feburary 15 to March 15 as 30 days even though it is actually 28.

Write as a Table

from	to	30/360()	actual
Feb 15, 2003	Mar 15, 2003	30	28
Feb 15, 2003	Mar 16, 2003	31	29

Name an Interpreter

Demo.CalendarFixture
from	to	thirty360()	actual()
Feb 15, 2003	Mar 15, 2003	30	28
Feb 15, 2003	Mar 16, 2003	31	29

Run the Example

Demo.CalendarFixture
from	to	thirty360()	actual()
Feb 15, 2003	Mar 15, 2003	30	28
Feb 15, 2003	Mar 16, 2003	31	29

http:run.cgi

Presto: Executable Spec

Story: 30/360 Financial Calendar

For the purpose of sharing unpaid interest of some bonds, compute elapsed days assuming every month has 30 days and every year 360 days.

Demo.CalendarFixture
from	to	thirty360()	actual()
Feb 15, 2003	Mar 15, 2003	30	28
Feb 15, 2003	Mar 16, 2003	31	29

http:run.cgi

run.cgi Examined

  curl $HTTP_REFERER input.html
  java fit.FileRunner input.html output.html

FileRunner Examined

  String tags[] = {"table", "tr", "td"};
  Parse tree = new Parse(input, tags);
  (new Fixture()).doTables(tree);
  tree.print(output);

eg.CalendarFixture Examined

  class CalendarFixture extends ColumnFixture {
    Date from;
    Date to;
    int thirty360() { ... }
    int actual() { ... }

Now Multiple Years

... and every year 360 days.

Demo.CalendarFixture
from	to	thirty360()	actual()
Feb 15, 2003	Mar 15, 2003	30	28
Feb 15, 2003	Mar 16, 2003	31	29
Feb 15, 2002	Mar 15, 2003	390	393

http:run.cgi

Process Check

Ward: have you passed that previous test? If not, go back and pass it before continuing this talk.

Table Formats

• Customers can define them.
• You can coax them.
• We help with samples.

Customers Like Word & Excel

• Easy to "add column"
• Both read & write html
• We just look for <td>'s

Standard Fixtures

• ColumnFixture -- logic
• ActionFixture -- interaction
• RowFixture -- result sets
• Fixture -- everything else

Implementations

• Java & clone
• C++, Delphi
• Perl, Python, Ruby
• CLOS, Scheme, Smalltalk

Related Projects

• JwebUnit, AntFit, &c
• FitNesse
• FitsterGui

Check it Out

http://fit.c2.com

• CalculatorExample
• MusicExample
• OsconTalk

Fit and Open Source

• OK Ward. It's my turn!

Fit and Open Source

• Fit helps foster communication between Managers, Developers and Testers in the enterprise
• Fit is also well suited to personal Open Source projects
• Perl Modules

• Brian Ingerson
• Perl Hacker
• YAML Language Designer
• Friend of Ward's

• Test::FIT
• CGI::Kwiki
• YAML.pm
• http://yaml.kwiki.org/index.cgi?PerlYamlLoad

• I run a kwiki in every module directory
• For Fit tests and documentation and notes
• By subclassing kwiki I can write pages to special places

• Test::FIT supports 'make test'.
• open t/output/Foo.html
• Document::T Subclass
• http://www.freepan.org/math/kwiki/

• I can change the way the Perl world does testing.
• Module::Install
• Seamless to Users

• More power to module authors
• Large-grained tests
• User submitted tests/bug reporting

• Write one test and implement it many languages
• YAML is a perfect project for this
• http://yaml.kwiki.org/in ... amlSpecRoundtrip
• http://fit.kwiki.org

• A CPAN for all languages
• Implement the same modules in multiple languages
• FIT could be the specification language