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ModernAPI

Testing Philosophy & TDD Mastery

Master test-driven development, testing strategies, and quality assurance practices

104 Total Tests97 Passed86% CoverageTDD Workflow
Testing Strategy Pyramid
Interactive testing pyramid with layer exploration
Unit Tests
127 tests • 94% coverage
Integration Tests
43 tests • 87% coverage
End-to-End Tests
18 tests • 76% coverage

Unit Tests

Fast, isolated tests for individual components and business logic

127
Tests
94%
Coverage
0.8s
Execution
70%
Confidence
Test Examples:
Domain entity business rules
Value object validation
Service method logic
Extension method functionality
Test Suites
Organized by architecture layer

Domain Layer Tests

48 tests

Unit tests for business logic and domain entities

45 passed2 failed1 skipped
94% coverage

Application Service Tests

32 tests

Tests for application services and orchestration logic

30 passed1 failed1 skipped
87% coverage

API Integration Tests

24 tests

End-to-end tests for HTTP endpoints

22 passed2 skipped
76% coverage
Live Test Runner
Real-time test execution with detailed results

User Entity Creation

unitdomain

Test user entity validation and business rules

8 assertions45ms98% coverage
passed

User Email Validation

unitdomain

Test email format validation in user entity

5 assertions32ms85% coverage
failed
Expected ArgumentException to be thrown for invalid email format

User Deactivation

unitdomain

Test user deactivation business logic

4 assertions28ms92% coverage
passed
TDD Workflow
Red-Green-Refactor cycle demonstration
1

RED

Write failing test

2

GREEN

Make test pass

3

REFACTOR

Improve code

Code Coverage Analysis
Interactive coverage hotspots and metrics
86%
Overall Coverage
4
Hotspots

Coverage Hotspots

high risk
67% coverage
Domain/Entities/User.cs:45

Complex email validation logic with multiple edge cases

Complexity: 8
high risk
73% coverage
Domain/Entities/Order.cs:123

Order total calculation with tax and discount logic

Complexity: 12
medium risk
82% coverage
Domain/Entities/Product.cs:89

Stock adjustment with concurrency checks

Complexity: 6
low risk
91% coverage
Application/Services/JwtTokenService.cs:67

JWT token generation and validation

Complexity: 4
Mocking Strategies
Test isolation and dependency management

Repository Mocking

Mock repository dependencies for isolated unit testing

Fast test executionIsolated testingDeterministic resultsNo database dependencies
Implementation Example
Performance Testing
Test execution metrics and optimization
2.3s
Avg Test Time
67ms
DB Round Trip
12GB
Memory Usage
99.7%
Success Rate

Optimization Tips

Use in-memory databases for integration tests
Parallel test execution for faster CI/CD
Mock external dependencies appropriately
Test data builders for maintainable setup
Categorize tests by execution speed
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Testing Philosophy & TDD

advanced

Comprehensive testing strategies from unit to integration testing

30 min
advanced
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