Exhaustive AAAT unit tests for GeneralUpdate.Core — untested component coverage

[JusterZhu]

Summary

This issue tracks the addition of comprehensive AAA-pattern unit tests for previously untested components in GeneralUpdate.Core.

Untested components now covered

Configuration

• BlackListConfigBuilder — fluent builder + BlackListConfig.HasRules logic
• ComparisonResult — AddToLeft/Right/Different + ReadOnly wrappers
• UpdateOptionValue<T> — value types, null handling, boxing, ToString
• UpdateOptions static defaults — all 15 option keys with correct default values
• HubConfig — default values, TimeSpan extremes
• Packet — nullable property tri-state behavior
• VersionOSS — OSS version model
• VersionRespDTO / BaseResponseDTO<T> — response DTOs
• BaseConfigInfo — all 13 default property values
• ConfigurationMapper — MapToProcessInfo edge cases, CopyBaseFields cross-type

Download

• DefaultDownloadPipeline — SHA256 verification (match/mismatch/case/null hash)
• DownloadProgressReporter — progress/completed/error callbacks + event dispatch
• DownloadAsset, DownloadPlan, DownloadProgress, DownloadResult — models
• PacketDTO, VersionRequest, VersionResponse — DTOs

FileSystem

• FileTreeDiffer — ProduceDeltaPaths, ProduceDeletes, ShouldUseDeltaPatching
• FileTreeSnapshot — FromEnumerator edge cases (empty dir, subdirectories, FileEntry)
• BlackListDefaults — static list contents + singleton identity

Pipeline

• PatchMiddleware — null differ skip, success invocation, exception propagation

Tracer

• GeneralTracer — all 5 log levels, Exception overloads, toggle, Dispose lifecycle
• TextTraceListener — Write/WriteLine, concurrent, dispose/double-dispose

Test Results

Total: 958 | Passed: 958 | Failed: 0 | Skipped: 0

Branch coverage checklist

Each test covers:

• Valid paths: expected inputs produce expected outputs
• Null paths: null input handling (return default, skip, or throw)
• Empty paths: empty collections/strings/arrays
• Boundary conditions: min/max values, threshold exact/above/below
• Exception paths: error propagation, exception types
• State transitions: toggle on/off, dispose lifecycle
• Concurrency: parallel writes, event listener isolation

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