Individual skill

migrate-static-to-wrapper

ALWAYS USE when asked to migrate, replace, or make testable existing C# static calls with a named wrapper or built-in abstraction: DateTime.UtcNow/Now or DateTimeOffset.UtcNow to TimeProvider/IClock, File.* to IFileSystem or an existing store such as ITextFileStore, and Environment.* to an existing reader such as IEnvironmentReader. Covers scoped files/projects, constructor injection, replacing temp-file or process-environment tests with fakes, "already registered" abstractions, and static classes whose callers/signatures must stay unchanged. Preserves DateTimeKind and call count. DO NOT USE for finding statics (detect-static-dependencies), choosing/designing a new wrapper (generate-testability-wrappers), behavior tests with no chosen seam (testability-obstacle), or test-framework migration.

plugins/dotnet-test/skills/migrate-static-to-wrapper/SKILL.md

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Repository stars (not skill ratings): 5,854
Repository last updated: Nov 8, 2026
License: MIT

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SKILL.mdcore · 20,922 bytes
SKILL.mdcore · 20,922 bytes

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# Migrate Static to Wrapper

Perform mechanical, codemod-style replacement of static dependency call sites with calls to injected wrapper interfaces or built-in abstractions. Operates on a bounded scope (single file, project, or namespace) so migrations can be done incrementally.

## When to Use

- After wrappers have been generated (via `generate-testability-wrappers`) or built-in abstractions identified
- Migrating `DateTime.UtcNow` → `TimeProvider.GetUtcNow()` across a project
- Migrating `File.*` → `IFileSystem.File.*` across a namespace
- Adding constructor injection for the new abstraction to affected classes
- Making a `static` utility class testable by adding an ambient seam (Step 3) while its existing call sites keep
  compiling unchanged
- Incremental migration: one project or namespace at a time
- Updating affected tests with fakes when the requested migration names the