solid-guard

Testing & Quality

INTERNAL DEV WORKFLOW for WpfHexEditor — Claude self-invokes after creating new C# files OR adding >50 lines to existing classes (especially under Services/, Managers/, *Manager.cs, *Service.cs). Heuristics that CORRELATE with SOLID violations: SRP (mixed UI+IO concerns, classes >300 lines + >15 public methods), OCP (massive switch statements >10 cases), DIP (newing services instead of injecting, static singleton mutation), ISP (fat interfaces, NotImplementedException stubs). LSP is out of scope (impossible to detect mechanically). All findings are ADVISORY (warn-only). Skip on: Tests/, Samples/, *.Designer.cs, *.g.cs.

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solid-guard (internal)

ADVISORY only. Heuristics that correlate with SOLID violations — not formal proofs. False positives are expected.

When I invoke

Situation	Run?
New `.cs` file, edit adds >50 lines, edit under `Services/`/`Managers/`/`Manager.cs`/`Service.cs`	yes
`Tests/`, `Samples/`, `.Designer.cs`, `.g.cs`, comment/rename only	no

Pipeline

scripts/solid-scan.ps1 -Files <paths> → SOLID: <summary> or OK + per-issue lines.

6 heuristics (all warn-only)

Rule	Detected via	Letter
`srp-mixed-concerns`	class touches `System.IO`/`File.` AND `System.Windows.`	S
`srp-class-too-broad`	class >300 lines AND >15 public methods	S
`ocp-massive-switch`	`switch` with >10 cases on a type/enum	O
`dip-newing-services`	`new XService(`/`new XManager(` outside a Factory	D
`dip-static-deps`	`<Type>.Instance.<Member> = …` (mutable singleton write)	D
`isp-fat-interface`	interface >10 members OR `NotImplementedException` stubs	I

LSP omitted — requires Roslyn semantic analysis. Full heuristic detail: references/solid-heuristics.md.

Suppressions

// solid-ok: <reason> silences a rule on that line. Auto-exempt: *Factory* files from dip-newing-services; *FileWatcher*/*FileMonitor* from srp-mixed-concerns.

Legitimate firing patterns:

Rule	Legitimate case	Annotation
`srp-mixed-concerns`	`*Adapter.cs` bridges IO→UI Dispatcher	`// solid-ok: bridge adapter`
`dip-newing-services`	composition root (App.xaml.cs, `*Module.cs`)	rename to `*Factory` or annotate
`ocp-massive-switch`	closed dispatch in parser/interpreter	`// solid-ok: closed enum dispatch`

Output

SOLID: 1 srp-mixed-concerns, 2 dip-newing-services, 1 isp-fat-interface
  FileMonitorService.cs:1   srp-mixed-concerns  uses File.* AND System.Windows.Threading
  CodeAnalysisRunner.cs:42  dip-newing-services new RoslynDiagnosticsCollector() — inject?
  IDocumentService.cs:14    isp-fat-interface   14 members (consider splitting)

Maintenance

New heuristic → row in references/solid-heuristics.md + extend $rules in solid-scan.ps1.