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controlling-the-test-clock

controlling-the-test-clock is a skill for Claude Code, Codex from skydoves/android-testing-skills. It costs 193 tokens per session (4,064 once invoked), scanned A, original, Apache-2.0.

A guide to manually controlling the clock used by Jetpack Compose tests to advance frames, recomposition, animations, and launched effects.

In plain words
What is it for?
Use it to advance animations by exact durations or frames, run pending work, wait for conditions, and understand the test clock's timing behavior.
Why use it?
It removes dependence on real elapsed time and explains why a test may show an unexpected frame or timeout.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 318 +6 3mo ago A scan 193 tokens original Apache-2.0
View the source file skydoves/android-testing-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/skydoves/android-testing-skills/controlling-the-test-clock
Any agent
npx skills add skydoves/android-testing-skills --skill controlling-the-test-clock
Clone the repo
git clone --depth 1 https://github.com/skydoves/android-testing-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for controlling-the-test-clock

README.md
[![agentmods](https://agentmods.dev/badge/skills/skydoves/android-testing-skills/controlling-the-test-clock.svg)](https://agentmods.dev/skills/skydoves/android-testing-skills/controlling-the-test-clock)
Your own site
<a href="https://agentmods.dev/skills/skydoves/android-testing-skills/controlling-the-test-clock"><img src="https://agentmods.dev/badge/skills/skydoves/android-testing-skills/controlling-the-test-clock.svg" alt="Measured on agentmods" height="20"></a>
Per session 193 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,064 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00193 $0.04064
Opus 5 $0.00097 $0.02032
Sonnet 5 $0.00039 $0.00813
Haiku 4.5 $0.00019 $0.00406

Measured 6d ago against content hash 6099eb9216d1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

controlling-the-test-clock scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

compose/synchronization/controlling-the-test-clock/SKILL.md · 249 lines

How it starts

The opening of the file, as written. The whole thing — 249 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Controlling the Test Clock — Frames, Time, and the Recomposer

MainTestClock is the only knob that drives recomposition, animations, and LaunchedEffects in a Compose test. This skill explains its surface, the 16 ms frame model behind it, and how autoAdvance flips the test from "framework drives the clock" to "the test drives the clock". The animation recipe and the idle/wait recipe live in sibling skills — this one establishes the mechanics they both depend on.

When to use this skill

  • The developer asks what mainClock.advanceTimeBy(...) actually does, why it rounds up, or why the animation seems off by one frame.
  • The developer is migrating from androidx.compose.ui.test.junit4.createComposeRule (v1) to androidx.compose.ui.test.junit4.v2.createComposeRule (v2) and tests now require an explicit mainClock.runCurrent() or advanceTimeBy(0).
  • The developer mentions MainTestClock, TestCoroutineScheduler, TestMonotonicFrameClock, ComposeTimeoutException, advanceTimeUntil, or "test clock vs wall clock".
  • The developer is writing a test that needs a particular frame count and is unsure whether advanceTimeBy(5) produces zero, one, or many frames.
  • The developer asks why the animation's playTime is still 0 after one frame.

When NOT to use this skill

  • The goal is a deterministic animation test (the autoAdvance = false recipe). Use ../testing-animations-deterministically/SKILL.md.
  • The goal is to wait on IdlingResources, async work, or "the UI is settled". Use ../synchronizing-with-idle/SKILL.md.
  • The goal is the higher-level test structure (rule wiring, setContent, JUnit lifecycle). Use ../../patterns/structuring-a-compose-test/SKILL.md.
  • The goal is choosing between createComposeRule and runComposeUiTest. Use ../../setup/choosing-test-rule-vs-runtest/SKILL.md.

Prerequisites

  • androidx.compose.ui:ui-test and androidx.compose.ui:ui-test-junit4 (or the JUnit-less runComposeUiTest) on the test source set.
  • A ComposeContentTestRule from createComposeRule() or a ComposeUiTest receiver from runComposeUiTest { … }.
  • PREFERRED: the v2 entry points (androidx.compose.ui.test.junit4.v2.createComposeRule, androidx.compose.ui.test.v2.runComposeUiTest). The v1 forms are @Deprecated(level = WARNING) (skydoves hot take #6).

Read the full file on GitHub · 249 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago First seen · 249 lines · 193 tokens per session scan A 6099eb9216d1

Subscribe to this mod's changes

controlling-the-test-clock is a skill published in the GitHub repository skydoves/android-testing-skills (318 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 193 tokens to every session and 4,064 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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