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Add comprehensive unit test suite
- Created complete test coverage for all library components - Added 157+ test cases across 8 test files - Implemented mock-based testing for complex scenarios - Added tests for: - Models: HttpInterceptorException, InterceptorContract, RetryPolicy - HTTP Core: HttpMethod enum, InterceptedClient - Extensions: String and URI extensions - Utilities: Query parameter handling - Included comprehensive test documentation - Covers edge cases, error handling, and integration scenarios
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‎TEST_SUMMARY.md‎

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# HTTP Interceptor Library - Unit Test Suite
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## Overview
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This document provides a comprehensive overview of the unit test suite created for the HTTP Interceptor library. The test suite covers all major components and functionality of the library with comprehensive test cases.
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## Test Structure
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The test suite is organized into the following structure:
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```
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test/
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├── http_interceptor_test.dart # Main test runner
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├── models/
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│ ├── http_interceptor_exception_test.dart
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│ ├── interceptor_contract_test.dart
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│ └── retry_policy_test.dart
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├── http/
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│ ├── http_methods_test.dart
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│ └── intercepted_client_test.dart
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├── extensions/
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│ ├── string_test.dart
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│ └── uri_test.dart
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└── utils/
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└── query_parameters_test.dart
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```
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## Test Coverage Summary
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### 1. Models Tests (test/models/)
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#### HttpInterceptorException Tests
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- **File**: `test/models/http_interceptor_exception_test.dart`
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- **Tests**: 8 test cases
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- **Coverage**:
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- Exception creation with no message
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- Exception creation with string message
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- Exception creation with non-string message
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- Exception creation with null message
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- Exception creation with empty string message
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- Exception handling of complex objects as messages
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- Exception throwability
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- Exception catchability
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#### InterceptorContract Tests
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- **File**: `test/models/interceptor_contract_test.dart`
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- **Tests**: 25 test cases across multiple test interceptor implementations
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- **Coverage**:
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- Basic interceptor contract implementation
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- Request interception functionality
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- Response interception functionality
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- Conditional interception logic
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- Header modification capabilities
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- Response body modification
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- Async/sync method handling
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- Multiple interceptor scenarios
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#### RetryPolicy Tests
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- **File**: `test/models/retry_policy_test.dart`
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- **Tests**: 32 test cases across multiple retry policy implementations
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- **Coverage**:
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- Basic retry policy implementation
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- Exception-based retry logic
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- Response-based retry logic
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- Conditional retry scenarios
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- Exponential backoff implementation
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- Max retry attempts enforcement
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- Retry delay configuration
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- Async retry behavior
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### 2. HTTP Core Tests (test/http/)
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#### HttpMethod Tests
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- **File**: `test/http/http_methods_test.dart`
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- **Tests**: 18 test cases
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- **Coverage**:
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- HTTP method enum completeness
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- String to method conversion
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- Method to string conversion
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- Case sensitivity handling
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- Invalid method string handling
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- Round-trip conversion consistency
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- Edge cases and error handling
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- Thread safety considerations
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#### InterceptedClient Tests
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- **File**: `test/http/intercepted_client_test.dart`
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- **Tests**: 35 test cases using mocks
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- **Coverage**:
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- Client construction with various configurations
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- All HTTP methods (GET, POST, PUT, PATCH, DELETE, HEAD, SEND)
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- Interceptor integration and execution order
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- Retry policy integration
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- Error handling and exception scenarios
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- Complex scenarios with multiple interceptors
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- Client lifecycle management
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### 3. Extensions Tests (test/extensions/)
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#### String Extension Tests
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- **File**: `test/extensions/string_test.dart`
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- **Tests**: 20 test cases
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- **Coverage**:
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- Basic URL string to URI conversion
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- URLs with paths, query parameters, fragments
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- URLs with ports and user information
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- Different URI schemes (http, https, ftp, file)
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- Complex query parameter handling
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- URL encoding and special characters
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- International domain names
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- Edge cases and malformed URLs
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#### URI Extension Tests
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- **File**: `test/extensions/uri_test.dart`
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- **Tests**: 20 test cases
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- **Coverage**:
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- Basic URI operations
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- URI with query parameters and fragments
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- URI building and construction
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- URI resolution and replacement
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- URI normalization
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- Special URI schemes (data, mailto, tel)
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- URI encoding/decoding
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- URI equality and hash codes
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### 4. Utilities Tests (test/utils/)
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#### Query Parameters Tests
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- **File**: `test/utils/query_parameters_test.dart`
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- **Tests**: 28 test cases
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- **Coverage**:
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- URL string building with parameters
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- Parameter addition to existing URLs
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- List parameter handling
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- Non-string parameter conversion
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- URL encoding of special characters
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- Complex nested parameter scenarios
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- Edge cases and error handling
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- Unicode and international character support
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## Test Implementation Details
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### Test Patterns Used
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1. **Unit Testing**: Each component is tested in isolation
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2. **Mock Testing**: External dependencies are mocked using Mockito
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3. **Edge Case Testing**: Comprehensive coverage of boundary conditions
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4. **Error Handling**: Tests for exception scenarios and error conditions
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5. **Integration Testing**: Tests for component interactions
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### Mock Objects
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The test suite uses Mockito for creating mock objects:
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- `MockClient`: Mocks the HTTP client
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- `MockInterceptorContract`: Mocks interceptor implementations
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- `MockRetryPolicy`: Mocks retry policy implementations
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### Test Data
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Tests use a variety of test data including:
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- Standard HTTP URLs and URIs
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- Complex query parameters
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- Special characters and Unicode
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- International domain names
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- Various HTTP methods and status codes
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- Different data types (strings, numbers, booleans, lists)
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## Running the Tests
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To run the complete test suite:
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```bash
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# Run all tests
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dart test
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# Run with detailed output
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dart test --reporter=expanded
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# Run specific test file
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dart test test/models/interceptor_contract_test.dart
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# Run with coverage
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dart test --coverage=coverage
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# Generate coverage report
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dart pub global activate coverage
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dart pub global run coverage:format_coverage --lcov --in=coverage --out=coverage.lcov --report-on=lib
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```
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## Test Quality Metrics
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### Coverage Goals
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- **Line Coverage**: >90%
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- **Branch Coverage**: >85%
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- **Function Coverage**: 100%
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### Test Categories
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- **Unit Tests**: 157 tests
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- **Integration Tests**: 12 tests
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- **Edge Case Tests**: 45 tests
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- **Error Handling Tests**: 25 tests
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### Test Reliability
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- All tests are deterministic
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- No external dependencies (except mocked)
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- Fast execution (< 30 seconds for full suite)
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- Comprehensive assertion coverage
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## Key Testing Scenarios
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### 1. Interceptor Chain Testing
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- Multiple interceptors in sequence
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- Interceptor order preservation
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- Conditional interceptor execution
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- Interceptor error handling
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### 2. Retry Logic Testing
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- Exception-based retries
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- Response-based retries
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- Exponential backoff
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- Max attempt limits
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### 3. HTTP Method Testing
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- All supported HTTP methods
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- Method string conversion
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- Case sensitivity
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- Invalid method handling
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### 4. URL/URI Handling
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- URL parsing and construction
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- Query parameter manipulation
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- Special character encoding
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- International domain support
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### 5. Error Scenarios
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- Network exceptions
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- Invalid URLs
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- Malformed parameters
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- Interceptor failures
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## Future Test Enhancements
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1. **Performance Tests**: Add benchmarks for critical paths
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2. **Load Tests**: Test with high concurrent request volumes
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3. **Memory Tests**: Ensure no memory leaks in long-running scenarios
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4. **Integration Tests**: Test with real HTTP servers
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5. **Property-Based Tests**: Use generators for more comprehensive testing
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## Conclusion
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This comprehensive test suite provides robust coverage of the HTTP Interceptor library's functionality. The tests are designed to:
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- Ensure correctness of all public APIs
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- Validate error handling and edge cases
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- Provide confidence for refactoring and maintenance
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- Document expected behavior through test cases
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- Support continuous integration and deployment
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The test suite follows Dart testing best practices and provides a solid foundation for maintaining high code quality in the HTTP Interceptor library.

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