1. Testing Microservices at Scale
Discover Card Acquisitions
Kishore Kota, Sindhu Nair

2. Agenda
Paradigm Shift in Testing
Monolithic vs Micro Services
Test Pyramid
End-to-end Test Strategy
Q & A

3. E2E
UAT
Integration
DEV
E2E
Acceptance
Integration
DEV
Paradigm Shift in Testing
Paradigm Shift in Testing

4. Testing Monolithic vs Micro Service
● Heavy reliance on End-To-End testing
● Longer Testing Cycle
● Lots of moving pieces
● Smaller Test Surface Area
● More complex system integration

5. Testing Pyramid

6. Unit Testing
• Validate code in Isolation
• Make use of Mocking and
Stubbing
• Validate code behavior
• Fine grained test cases

7. Contract Testing

8. System Integration Testing
• Stub out API Dependencies locally
• Actual API when deployed to actual runtime
• Validation focus should be on your API

9. Backwards Compatibility Testing
• Can the old app work with new Database ?
• Does the blue – green install cause outage ?
• Can the release be backed out if needed ?

10. Performance Testing
• Create automation focusing on API boundaries
• Isolate test subject by decoupling from dependencies using virtualization
• Make sure test are run in short intervals and provide quick feedback

11. Vulnerability Testing
• Reuse Integration Test artifacts
• Execute System Integration Test for Contrast DSAT
• Pipeline to enforce governance

12. Disruptive Testing
• Simulate infra down to see app behavior
• Get to a known state with outage
• Identify gaps in design to address downtime

13. End to End User Journey Testing
• Daily execution of E2E user
journey test suite
• Dedicated test environment
• Refreshed from prod every
morning
• Changes are staged to test
environment before cut off
time
• Failed test cases are rerun

14. Browser Compatibility Testing
• Executed in parallel to end-to-end testing
• Use Selenium WebDriver
• Leverage Cross Browser Testing tool

15. Production Smoke Testing
• Staging space in Production to ensure Application are configured correctly and validate network
connection
• Validate JWT
• Validate Connectivity to dependent apis
• Check Certificates and Network Connection

16. Testing Stages and Testing Environments
Pipeline delivers code to
next stage after
successful completion of
previous stage of testing
C
o
n
t
i
n
u
o
u
s
I
n
t
e
g
r
a
t
i
o
n
,
C
o
n
t
i
n
u
o
u
s
D
e
l
i
v
e
r
y
How the Testing Pyramid is executed ?

17. Q & A