How do I install the Migrate Mstest V3 To V4 Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/migrate-mstest-v3-to-v4/SKILL.md and restart Claude Code. Both flows are detailed at https://claudskills.com/install/.

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

ClaudSkills / Engineering / testing

Migrate Mstest V3 To V4

Category: Engineering · Sub-category: testing · Last updated: 2026-05-21

Fix build errors and breaking changes after upgrading MSTest from v3 to v4, or plan a complete MSTest v3-to-v4 migration. Use when user says "upgrade to MSTest v4", "MSTest 4 migration", "MSTest v4 breaking changes", "tests don't compile after upgrading MSTest", or has errors CS0507, CS0103, CS1061, CS1615 after updating MSTest packages from 3.x to 4.x. USE FOR: Execute to ExecuteAsync, CallerInfo constructor on TestMethodAttribute, sealed custom attributes, ClassCleanupBehavior removal, TestContext.Properties Contains to ContainsKey, Assert.ThrowsException to ThrowsExactly, Assert.IsInstanceOfType out parameter removal, ExpectedExceptionAttribute removal, TestTimeout enum removal, [TestMethod("name")] to DisplayName syntax, TreatDiscoveryWarningsAsErrors, TestContext.TestName in ClassInitialize, MSTest.Sdk MTP changes, dropped TFMs (net6.0/net7.0 to net8.0+). DO NOT USE FOR: migrating from MSTest v1/v2 to v3 (use migrate-mstest-v1v2-to-v3 first), migrating between test frameworks, or general .NET upgrades.

From the source SKILL.md

Migrate a test project from MSTest v3 to MSTest v4. The outcome is a project using MSTest v4 that builds cleanly, passes tests, and accounts for every source-incompatible and behavioral change. MSTest v4 is not binary compatible with MSTest v3 -- any library compiled against v3 must be recompiled against v4.

What this skill does

Migrate Mstest V3 To V4 is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/migrate-mstest-v3-to-v4/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when user says "upgrade to MSTest v4", "MSTest 4 migration", "MSTest v4 breaking changes", "tests don't compile after upgrading MSTest", or has errors CS0507, CS0103, CS1061, CS1615 after updating MSTest packages from 3.x to 4.

Who uses this skill

The Migrate Mstest V3 To V4 Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/migrate-mstest-v3-to-v4
curl -L https://claudskills.com/skills/migrate-mstest-v3-to-v4/SKILL.md \
  -o ~/.claude/skills/migrate-mstest-v3-to-v4/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/migrate-mstest-v3-to-v4/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/migrate-mstest-v3-to-v4/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\migrate-mstest-v3-to-v4\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

License: MIT

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

ClaudSkills. (2026). Migrate Mstest V3 To V4 [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/migrate-mstest-v3-to-v4/

BibTeX

@misc{migrate-mstest-v3-to-v4-2026,
  author    = {ClaudSkills},
  title     = {Migrate Mstest V3 To V4 [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/migrate-mstest-v3-to-v4/}
}

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Badge

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