Behavior Driven Development - A short introduction for manager, project manager, developer, business analyst...

1. L A J O U R N É E A G I L E D U C R É D I T A G R I C O L E
Nos premiers pas autour du
Behavior Driven Development (BDD)
Arnauld LOYER
AROLLA

2. Mastering Software Developmentarolla.fr

3. @aloyer
For You, what is BDD About?
having conversation
non-regression testing
user-acceptance tests
writing scenario
given-when-then
? cucumber/spec-flow/FIT
automation
testing new functionalities
a golden hammer

4. Exercise: Draw a 12 points Star
@aloyer

5. Read the specification
What is the most important information ?
Interpolation is a mathematical process to estimate the value of a dependent variable based on the values of known
surrounding dependent variables, where the dependent variable is a function of an independent variable. It's used to
determine interest rates for periods of time that are not published or otherwise made available. In this case, the interest rate
is the dependent variable, and the length of time is the independent variable. To interpolate an interest rate, you'll need the
interest rate of a shorter period of time and a longer period of time.
1. Subtract the interest rate of a time period shorter than the time period of the desired interest
rate from the interest rate of a time period longer than the time period of the desired interest
rate.
How to Interpolate Interest Rates
2. Divide the result from Step 1 by the difference between the lengths of the two time periods.
3. Multiply the result from Step 2 by the difference between the length of time for the desired
interest rate and the length of time for the interest rate with shortest length of time
4. Add the result from Step 3 to the interest rate for the shortest known time period.
The linear interpolation
is an estimate for the
interest rate of a specific
time period, and it
assumes that the
interest rate changes on
a straight line basis
between each day. In
reality, interest rates may
follow a "yield curve"
instead of a straight line.
The estimate will be
more accurate the
shorter the period of
time between the known
interest rates you are
interpolating from.

6. Interpolation is a mathematical process to estimate the value of a dependent variable based on the
values of known surrounding dependent variables, where the dependent variable is a function of an
independent variable. It's used to determine interest rates for periods of time that are not published
or otherwise made available. In this case, the interest rate is the dependent variable, and the length
of time is the independent variable. To interpolate an interest rate, you'll need the interest rate of a
shorter period of time and a longer period of time.
1. Subtract the interest rate of a time period shorter than the time period of the desired interest rate
from the interest rate of a time period longer than the time period of the desired interest rate.
How to Interpolate Interest Rates
2. Divide the result from Step 1 by the difference between the lengths of the two time periods.
3. Multiply the result from Step 2 by the difference between the length of time for the desired
interest rate and the length of time for the interest rate with shortest length of time
4. Add the result from Step 3 to the interest rate for the shortest known time period.
The linear interpolation is an estimate for the interest rate of a specific time period, and it assumes
that the interest rate changes on a straight line basis between each day. In reality, interest rates may
follow a "yield curve" instead of a straight line. The estimate will be more accurate the shorter the
period of time between the known interest rates you are interpolating from.
http://www.ehow.com/how_8396129_interpolate-interest-rates.html

7. http://www.modernanalyst.com/Resources/BusinessAnalystHumor/tabid/218/ID/2548/
How_to_Get_Approval_from_the_Functional_Specification_Stakeholders.aspx

8. https://www.flickr.com/photos/ohhector/456611804
Who will read the specs? Do I write the specs for myself?

9. Chaos Report - Standish group
Project Challenged Factors
1. Lack of User Input 12.8%
2. Incomplete Requirements & Specifications 12.3%
3. Changing Requirements & Specifications 11.8%
4. Lack of Executive Support 7.5%
5. Technology Incompetence 7.0%
6. Lack of Resources 6.4%
7. Unrealistic Expectations 5.9%
8. Unclear Objectives 5.3%
9. Unrealistic Time Frames 4.3%
10. New Technology 3.7%
Project Impaired Factors % of
1. Incomplete Requirements 13.1%
2. Lack of User Involvement 12.4%
3. Lack of Resources 10.6%
4. Unrealistic Expectations 9.9%
5. Lack of Executive Support 9.3%
6. Changing Requirements & Specifications 8.7%
7. Lack of Planning 8.1%
8. Didn't Need It Any Longer 7.5%
9. Lack of IT Management 6.2%
10. Technology Illiteracy 4.3%

10. What about you? What do you see?
Test de Rorschach - Planche n°1

11. What about you? What do you see?
The Art of Clean Up: Life Made Neat and Tidy by Ursus Wehrli

12. What about you? What do you see?
The Art of Clean Up: Life Made Neat and Tidy by Ursus Wehrli

13. What about you? What do you see?
The Art of Clean Up: Life Made Neat and Tidy by Ursus Wehrli

14. Why change?

15. @aloyer

16. Why did you
come here
today?

18. Shared documents aren’t shared
understanding - @jeffpatton
http://www.math.u-bordeaux1.fr/~abachelo/enseignement.html

19. http://defringe.com/article/kai-ziehl
Build a Shared Understanding

20. Three Amigos

21. Back to Interpolation!

22. 23/06/2015
15:36:27
UTC
30/06/2015
23:59:60
UTC
29/06/2015
14:36:58
UTC
26/06/2015
15:36:27
UTC
24/06/2015
15:36:27
UTC
1.0
1.5
2.5
3.5
6.5
?

23. 23/06/2015
15:36:27
UTC
30/06/2015
23:59:60
UTC
29/06/2015
14:36:58
UTC
26/06/2015
15:36:27
UTC
24/06/2015
15:36:27
UTC
1.0
1.5
2.5
3.5
5.5
5.5 - 1/3*(5.5-3.5) ≈ 4.83333333333333333
OK?

24. !
!!
Developper
Tester/QA
Domain Expert
BDD is the art of using examples in
conversation to illustrate behavior

25. value
cost
Conversation Automatisation
Living
Documentation
unit sub
system
end
to
end
"
#
!!! $ %
|
'(
○
○
○
○

26. having conversations is more important than
capturing conversations is more important than
automating conversations
- Liz Keogh
https://www.flickr.com/photos/ironrodart/8678383872/

27. Examples
Tests
Requirements
clarify
can become
verify
@aloyer

28. Show me
some real
examples!

29. @aloyer
Examples of « Horse Betting » scenario

30. @aloyer
Examples of « Horse Betting » scenario

31. @aloyer
Scenario: Without an audit, I cannot cancel a deal with a passed value date
Given I have inserted a standard OTC deal with a standard product and the
following specific
| price | trade date | value date |
| 50 | 2014-JUL-01 | 2014-JUL-01 |
When I try to cancel the deal
Then I should have an error message indicating "The input is not intraday: you
must provide a justification"
Scenario: Volume OTC deals
Given a standard option
And a standard external OTC deal with the following specifics
| way | quantity |
| buy | 100 |
When I create the option
And I create the deal with the created product
And I generate the report Volume OTC deals
Then the deal should appear in the report
Examples of « CIB » scenario

32. @aloyer
Scenario: The portfolio position of an OTC option is properly impacted when a
deal is created
#
# In financial trading, a position is a binding commitment to buy or sell a given amount
# of financial instruments, such as securities, currencies or commodities, for a given price.
#
# The term "position" is also used in the context of finance for the amount of securities
# or commodities held by a person, firm, or institution, and for the ownership status of
# a person's or institution's investments.
#
# Note: strike is part of the unicity of the product; by using different strike value one
# can ensure product is different among scenario
Given a standard option with no specifics
And a standard external OTC deal with the following specifics
| portfolio | direction | quantity |
| PR-GT-FR | buy | 100 |
When I create the option
And I check the position of the option in portfolio PR-GT-FR for TODAY
And I create the deal with the created option
Then the position of the option in portfolio PR-GT-FR for TODAY should be
the checked position - 100
Examples of « CIB » scenario

33. https://mes-aides.gouv.fr/tests/ - 2015-MAR-16

34. https://mes-aides.gouv.fr/tests/ - 2015-MAR-16

35. https://mes-aides.gouv.fr/tests/ - 2015-MAR-16

36. What is
the setup?

37. BDD = Shared understanding
by discussing examples
!
!!
Developper
Tester/QA
Domain Expert
+
Collaboration
Not Agile

38. +
BDD = Shared understanding
by discussing examples
!
!!
Developper
Tester/QA
Domain Expert
Business Analyst
[A]MOA
!
Collaboration
Not Agile

39. +
BDD = Shared understanding
by discussing examples
!
!
!
Developper
Tester/QA
Domain Expert
Business Analyst
[A]MOA
!
Collaboration
Not Agile

40. +
BDD = Shared understanding
by discussing examples
!
!
!
Developper
Tester/QA
Domain Expert
Business Analyst
[A]MOA
!
Collaboration
Not Agile
erf…

41. Mastering Software Developmentarolla.fr
Questions?