Comprehensive Unit Test Coverage for GeneralUpdate.Core — AAA Pattern (801+ Test Points)

[JusterZhu]

Overview

This issue tracks the implementation of comprehensive unit tests for GeneralUpdate.Core following the AAA (Arrange-Act-Assert) pattern, targeting exhaustive branch coverage across all 14 modules and ~66 classes.

Test Design Document

The complete test design specification has been produced (801 test points), covering:

Module	Classes	Test Points
Configuration	15	~120
FileSystem	8	~95
HashAlgorithms	2	~8
Compress	3	~33
Pipeline	6	~30
Strategy (OS)	4	~30
Strategy (Role)	3	~45
Bootstrap	2	~25
Event	1	~18
Silent	1	~26
Download	10	~220
Network	2	~40
Security	5	~29
IPC	5	~68
GracefulExit	1	~14
Total	~66	~801

Coverage Strategy

Each test point covers:

• ✅ All logic branches (if/else/switch/ternary)
• ✅ Boundary conditions (null, empty, whitespace, zero, negative, max)
• ✅ Exception paths (argument validation, file I/O, network, crypto)
• ✅ Loop branches (for/foreach/while, including empty and single-iteration)
• ✅ Recursive branches (tree traversal: empty, leaf, full node)
• ✅ Nested conditions (if-within-if, null-coalescing chains)
• ✅ Value extremes (int.MinValue/MaxValue, large strings, deep nesting)

Acceptance Criteria

• xUnit test project created under \src/c#/CoreTest\
• Test classes organized by module (matching namespace structure)
• All tests follow AAA pattern with clear Arrange/Act/Assert sections
• Moq used for external dependencies (file system, network, process)
• All tests compile and pass (\dotnet test)
• Each test method name follows: \MethodName_Scenario_ExpectedBehavior\

Test Framework

• xUnit 2.x
• Moq 4.x
• Coverlet (code coverage)

Related

• Source: \src/c#/GeneralUpdate.Core\
• Target framework: net10.0 / net8.0 / netstandard2.0