我覺得草莓尬肉粽不行: 從草莓肉粽了解整合測試的重要性

活動：LINE Developers Meetup 開發者小聚 #18 - TECH FRESH 畢業展
活動頁面：https://linegroup.kktix.cc/events/20230627-tech-fresh-gratudation
講者：Brian Kuo, TECH FRESH @ LINE TRAVEL

Transcript

1. 我覺得草莓尬⾁粽不⾏：從草
   莓⾁粽了解整合測試的重要性
   Brian Kuo, TECH FRESH @ LINE TRAVEL Backend
   

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2. ⾁粽 OK！草莓也 OK！
   ※ Source from ︓
   • https://reurl.cc/RzXA3e
   • https://removal.ai/
   • https://www.gomaji.com/blog/%E7%AB%AF%E5%8D%88%E8%82%89%E7%B2%BD/
   

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3. 但草莓⾁粽…
   單獨都好吃，合起來怎麼就變這麼奇怪？
   ※ Source from ︓
   • https://reurl.cc/RzXA3e
   • https://removal.ai/
   • https://www.gomaji.com/blog/%E7%AB%AF%E5%8D%88%E8%82%89%E7%B2%BD/
   

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4. 01
   02
   03
   04
   05
   Contents
   Background & Motivation
   Unit tests vs. Integration tests
   Difficulties in Integration tests
   Intro to Testcontainers
   A concrete example
   

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5. Integration tests
   Unit tests vs. Integration tests
   Database connection
   External API calls
   Isolation
   Mock / Stub
   Unit tests
   External Service Integration
   

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6. Latency, packet loss,
   unreliable network
   channels
   Network Issue
   Expected state or
   behavior doesn’t match
   between two ends
   Data Inconsistency
   Concurrent operation
   leads to unexpected
   behavior
   Race Condition
   Even though two modules may separately pass their own unit tests,
   they may still fail when combined altogether
   Integration tests might fail...
   

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7. Historic Implementations of Integration tests
   Pre-provisioned Infrastructure
   Setup Cost
   Test Pollution
   In-memory Database Service
   Challenges in maintaining an “Integration Testing Environment”
   Difficulties in Integration tests
   Feature Limitation
   Slow Feedback Cycle
   Testcontainers solves these issues!
   ※ Source from ︓
   • https://testcontainers.com/guides/introducing-testcontainers/
   • https://www.flaticon.com/
   

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8. Real Services Docker Containers
   Ensure consistency across
   different development stages
   • easy to setup and teardown
   • provide a clean and complete
   instance
   Intro to Testcontainers
   A testing library that supports integration tests with real
   services wrapped in Docker containers
   ※ Source from ︓
   • https://testcontainers.com/guides/introducing-testcontainers/
   Include external dependencies
   within our tests
   • database layer
   • stream processing
   • any docker images
   

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9. Workflow of
   Testcontainers
   • Before Tests:
   • Launch required services. E.g.,
   databases, external dependencies.
   • During Tests:
   • Your tests will run using these
   containerized services.
   • After Tests:
   • destroying those started containers
   gracefully without interference.
   ※ Source from ：
   • https://testcontainers.com/guides/introducing-testcontainers/
   

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10. Benefits from using
    Testcontainers
    • No pre-provisioned infra needed
    • No data conflict issues
    • Local test support
    • Support multiple languages,
    including .NET, Go, NodeJS, and Python
    ※ Source from ：
    • https://testcontainers.com/guides/introducing-testcontainers/
    

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11. Here, we perform integration tests with Testcontainers using TypeScript & Jest
    A concrete example
    Utilize Testcontainers with lightweight API Containers being launched during test running
    

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12. Let’s see how it works in reality!
    Demo video
    

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13. THANK YOU
    

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