SpringOne 2021 Session Title: Microservices Testing at Scale Speakers: Kishore Kota, Sr Architect at Discover Financial Services; Sindhu Nair, Principal Value Stream Architect at Discover Financial Services; Ying Zhe, Director, Application Development at Discover Financial Services

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
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How the Testing Pyramid is executed ?

17. Q & A