Mocking With Mockk

Q: What is a Claude Code skill and how does the Mocking With Mockk skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Mocking With Mockk is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Engineering · Sub-category: testing · Last updated: 2026-05-28

lang:kotlin

Use this skill to wire MockK (the Kotlin-first mocking framework) into a JVM unit-test suite, especially when coroutines, singleton/`object` mocking, or constructor mocking dominate. Covers `io.mockk:mockk-jvm:1.14.x` (and `mockk-android` + `mockk-agent` for instrumented), `every { } returns`, `coEvery` / `coVerify` (native suspend support — the big win over Mockito), `mockk(relaxed = true)` / `relaxUnitFun = true`, `slot<T>()` capture, `verifySequence` / `verifyOrder` / `confirmVerified`, `mockkStatic` / `mockkObject` / `mockkConstructor` with `unmockkAll()` cleanup, `@MockK` / `@RelaxedMockK` / `@SpyK` / `@InjectMockKs` annotations, and the Mockito-vs-MockK decision criteria. Use when the user mentions `coEvery`, `mockkObject`, `mockkStatic`, `slot`, `MockKException`, `every returns vs coEvery`, `relaxed = true`, or asks how to mock a Kotlin `object`/singleton.

About this skill (catalog notes)

Mocking With Mockk includes explicit scope boundaries (an explicit 'when not to use' or 'out of scope' section); a dedicated installation section; 14 code blocks for direct copy-paste. At roughly 2,012 words the SKILL.md is on the longer end of the catalog distribution.

License: Apache-2.0
Original author: skydoves
Indexed lastmod: 2026-05-28
Catalog position: Engineering · testing
Indexed related skills: 10

How Mocking With Mockk fits the catalog

Mocking With Mockk sits in the Engineering category under the testing sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

MockK is the Kotlin-first alternative to Mockito. Its headline wins are native suspend support (coEvery / coVerify with no runBlocking dance), first-class singleton / object / static / constructor mocking, and Kotlin-native syntax (every { … } returns x). The trade-off: androidx itself does NOT use MockK (a grep -r "io.mockk" over the AOSP checkout returns zero hits — see ../mocking-with-mockito/SKILL.md for the dominant pattern). New Kotlin code outside Google often picks MockK; new Kotlin code inside Google or matching AOSP conventions picks Mockito. Both are valid.

What this skill does

Mocking With Mockk 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/mocking-with-mockk/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user mentions `coEvery`, `mockkObject`, `mockkStatic`, `slot`, `MockKException`, `every returns vs coEvery`, `relaxed = true`, or asks how to mock a Kotlin `object`/singleton.

Who uses this skill

The Mocking With Mockk 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 97,000+ 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/mocking-with-mockk
curl -L https://claudskills.com/skills/mocking-with-mockk/SKILL.md \
  -o ~/.claude/skills/mocking-with-mockk/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/mocking-with-mockk/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/mocking-with-mockk/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\mocking-with-mockk\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

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

Frequently asked questions

How do I install the Mocking With Mockk Claude Code skill?

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

What does the Mocking With Mockk skill do?

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.

When should I use the Mocking With Mockk skill?

Use Mocking With Mockk when your Claude Code task falls under the Engineering category — specifically in the testing area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Mocking With Mockk" or describe the task and let Claude pick). Browse related skills at /category/engineering/.

What is a Claude Code skill and how does the Mocking With Mockk skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Mocking With Mockk is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/skydoves/android-testing-skills/blob/HEAD/jvm-tests/mocking/mocking-with-mockk/SKILL.md
License: Apache-2.0
Author: skydoves

Cite this skill

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

APA

skydoves. (2026). Mocking With Mockk [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/mocking-with-mockk/

BibTeX

@misc{mocking-with-mockk-2026,
  author    = {skydoves},
  title     = {Mocking With Mockk [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/mocking-with-mockk/}
}

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