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CodeSignal

Increasing Code Test Coverage

via CodeSignal

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Overview

This course explores how to improve code test coverage and foster a more testable codebase. Increasing code test coverage is essential for ensuring confidence in modifying existing systems. It allows developers to make changes with minimal risk of introducing bugs, by providing a safety net of tests that document existing and desired behaviors.

Syllabus

  • Unit 1: What Will be Covered in This Course Path
    • Order Processing with Unit Testing
  • Unit 2: Why We Want to Increase Code Test Coverage
    • Adding the First Test to the Order Processor
    • Add New Test For Multiple Different Items
    • Adding a Test for Zero Order Items
    • Ensuring Orders Have Correct Processing Date Set
  • Unit 3: Increasing Code Test Coverage by Adding Characterization Tests
    • Adding a Test Confirming Order Item Quantity Limit
    • Test Demonstrating Discound Behavior
    • Documenting the Shipping Method Determination
    • Order Processing Uses Express Shipping for High Quantities
    • Shipping Rules Make Perfect Sense
    • Order Processing Edge Case Test
  • Unit 4: Increasing Testability - Adding Interfaces and Mocks
    • Email Service Dependency Done Right
    • Email Service Implementing Interface
    • Exchange Concrete Email Service for an Abstraction
    • Mock Dependencies in Order Processing
    • Adding Tests That Utilize Mocks
  • Unit 5: Bringing Writing Tests and Mocks Together
    • Creating a Database Abstraction
    • Using the Abstraction as a Dependency
    • Setting Up Test Environment Basics
    • User Login Test
    • Mock Database User Login Tests
    • Database Exception Testing Made Simple

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