Testing Coroutines With Runtest

Q: What is a Claude Code skill and how does the Testing Coroutines With Runtest 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. Testing Coroutines With Runtest 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 test suspend functions and coroutine-using classes on the JVM with kotlinx-coroutines-test. Covers runTest, TestScope, StandardTestDispatcher vs UnconfinedTestDispatcher, virtual time via TestCoroutineScheduler (advanceTimeBy, advanceUntilIdle, runCurrent), the canonical MainDispatcherRule wrapper for Dispatchers.setMain/resetMain, the TestResult Promise contract on KMP, and the runBlockingTest -> runTest migration. If the user mentions runTest, runBlockingTest deprecated, advanceUntilIdle, advanceTimeBy, TestScope, StandardTestDispatcher, UnconfinedTestDispatcher, MainDispatcherRule, "Module with the Main dispatcher is missing", "test hangs forever", dispatchTimeoutMs, viewModelScope test, or a ViewModel that posts state from a coroutine, use this skill.

About this skill (catalog notes)

Testing Coroutines With Runtest includes explicit scope boundaries (an explicit 'when not to use' or 'out of scope' section); a dedicated installation section; worked examples. At roughly 2,244 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 Testing Coroutines With Runtest fits the catalog

Testing Coroutines With Runtest 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

runTest is the only correct entry point for testing suspend functions and viewModelScope-backed code on the JVM. This skill nails down the TestScope contract, the two TestDispatcher flavors, the shared TestCoroutineScheduler virtual clock, and the MainDispatcherRule plumbing that keeps Dispatchers.setMain from leaking between tests. Flow-specific assertions live in ../testing-flows-with-turbine/SKILL.md.

What this skill does

Testing Coroutines With Runtest 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/testing-coroutines-with-runtest/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Testing Coroutines With Runtest 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/testing-coroutines-with-runtest
curl -L https://claudskills.com/skills/testing-coroutines-with-runtest/SKILL.md \
  -o ~/.claude/skills/testing-coroutines-with-runtest/SKILL.md

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

Skills live at ~/.claude/skills/testing-coroutines-with-runtest/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\testing-coroutines-with-runtest\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 Testing Coroutines With Runtest Claude Code skill?

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

What does the Testing Coroutines With Runtest 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 Testing Coroutines With Runtest skill?

Use Testing Coroutines With Runtest 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 Testing Coroutines With Runtest" or describe the task and let Claude pick). Browse related skills at /category/engineering/.

What is a Claude Code skill and how does the Testing Coroutines With Runtest 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. Testing Coroutines With Runtest 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/coroutines/testing-coroutines-with-runtest/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). Testing Coroutines With Runtest [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/testing-coroutines-with-runtest/

BibTeX

@misc{testing-coroutines-with-runtest-2026,
  author    = {skydoves},
  title     = {Testing Coroutines With Runtest [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/testing-coroutines-with-runtest/}
}

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