TGT#18 - BDD with The Three Amigos in API Testing - Julia Szarlej tgt.org.pl

1. BDD with The Three Amigos
in API testing
Julia Szarlej · QA

2. Made with by PGS Software ·START FROM SCRATCH 2
Backend

3. Agenda

4. Made with by PGS Software · 4
Process Collaboration
• Tester
• Developer
• Product Owner
The Three Amigos

5. Made with by PGS Software ·
Customer
Implementation
Requirements
Brainstorm
5
BDD with The Three Amigos
STEP 1
STEP 2
STEP 3
STEP 4

6. Made with by PGS Software · 6
BDD
• Test scenarios using Gherkin
language
Process
Scenarios

7. Made with by PGS Software · 7
Wiremock
• Implementing step definitions
against mocks
Process
Mocks

8. Made with by PGS Software · 8
Process Swagger
• API documentation
Documentation
https://swagger.io/

9. Made with by PGS Software · 9
Process Presenting results
• feedback
Demo

10. Made with by PGS Software · 10
BDD Checking expected responses
Given I have a valid engine number
When I request for the engine’s details
Then The response shows the details of my
favourite engine
Positive scenarios

11. Made with by PGS Software · 11
BDD Error handling
Given I have an engine number that does not exist in the
engines database
When I request for the engine’s details
Then the error code is „404”
And the response is an error „Engine Not Found”
Negative scenarios

12. Before
BBD scenario with 120 lines
After
BDD scenario with 4 lines
Given an engine number
And the value „A” is „1”
And the value „B” is „2”
And the value „C” is „3”
And the value „D” is „4”
And the value „E” is „5”
And the value „F” is „6”
And the value „G” is „7”
...
When the request is made
Then the value „1” is „10”
And the value „2” is „20”
And the value „3” is „30”
And the value „4” is „40”
And the value „5” is „50”
And the value „6” is „60”
And the value „7” is „70”
And the value „8” is „80”
And the value „9” is „90”
...
Given I have an engine number
And the request body
When I request for engine’s details
Then The response shows the details
of my favourite engine

13. Made with by PGS Software · 13
Approach HTTP requests
• Java library for handling REST web
services calls
REST Assured

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Approach Assertion matchers
• assertThat
Hamcrest
@Test
public void checkResponse(String message) {
assertThat(response, containsString(message));
}

15. Made with by PGS Software · 15
Approach Checking JSON
• Comparing the whole file
• Comparing values
JSON
Actual
result
Expected
result

16. Made with by PGS Software · 16
Tools Demo
Swagger
Wiremock

17. Made with by PGS Software · 17
Tools
Jenkins
Jenkins Pipeline
• Wiremock job

18. ChallengesAdvantages

19. Made with by PGS Software ·ADVANTAGES 19
Tests can be
implemented in
parallel, usually
finished first

20. Made with by PGS Software ·ADVANTAGES 20
Early defect
detection and
correction

21. Made with by PGS Software ·ADVANTAGES 21
Business point
of view makes
test scenarios
better

22. Made with by PGS Software ·CHALLENGES 22
Switching from
mock to real
implementation

23. Made with by PGS Software ·CHALLENGES 23
Implementing
scenarios not
always easy

24. Made with by PGS Software · 24
You are The
Really Useful
Tester!

25. Thank you!
Julia Szarlej
Go visit pgs-soft.com