Testing Animations Deterministically

Q: What is a Claude Code skill and how does the Testing Animations Deterministically 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 Animations Deterministically 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

Use this skill to write non-flaky Compose animation tests by setting mainClock.autoAdvance = false and stepping frames by hand with advanceTimeByFrame and advanceTimeBy(durationMillis). Explains why InfiniteAnimationPolicy cancels indeterminate animations the moment the test starts unless autoAdvance is disabled, why the first frame after a state toggle does not initialize playTime, and why state mutations during the paused-clock window must go through runOnUiThread instead of runOnIdle. If the user mentions "animation never finishes", "InfiniteAnimationPolicy CancellationException", "Crossfade test flaky", "indeterminate progress indicator", "Thread.sleep(500) waiting for animation", advanceTimeByFrame, advanceTimeBy, or autoAdvance, use this skill.

About this skill (catalog notes)

Testing Animations Deterministically 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 1,899 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 Animations Deterministically fits the catalog

Testing Animations Deterministically 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

A Compose animation test that does not pause the clock is by definition flaky. With mainClock.autoAdvance = true (the default), the framework's InfiniteAnimationPolicy throws CancellationException as soon as an indeterminate animation starts, and finite animations finish in a single auto-advanced burst with no observable intermediate state. This skill teaches the five-line recipe that fixes that, plus the runOnUiThread-vs-runOnIdle gotcha that bites every developer who tries it for the first time.

What this skill does

Testing Animations Deterministically 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-animations-deterministically/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Testing Animations Deterministically 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 93,000+ 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-animations-deterministically
curl -L https://claudskills.com/skills/testing-animations-deterministically/SKILL.md \
  -o ~/.claude/skills/testing-animations-deterministically/SKILL.md

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

Skills live at ~/.claude/skills/testing-animations-deterministically/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\testing-animations-deterministically\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 Animations Deterministically Claude Code skill?

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

What does the Testing Animations Deterministically 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 Animations Deterministically skill?

Use Testing Animations Deterministically 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 Animations Deterministically" 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 Animations Deterministically 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 Animations Deterministically 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/compose/synchronization/testing-animations-deterministically/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 Animations Deterministically [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/testing-animations-deterministically/

BibTeX

@misc{testing-animations-deterministically-2026,
  author    = {skydoves},
  title     = {Testing Animations Deterministically [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/testing-animations-deterministically/}
}

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