Agent skill

Android Test Batching

Guide for auditing and applying batching annotations (@Batch) and AutoReset rules (AutoResetCtaTransitTestRule) to Android javatests in Chromium.

BSD-3-ClauseAuto-check passedMobile

Install Android Test Batching

skills CLI

$ npx skills add nwjs/chromium.src --skill android-test-batching -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install nwjs/chromium.src android-test-batching --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .claude/skills && cp -r skills-src/agents/skills/android-test-batching .claude/skills/android-test-batching && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "android-test-batching" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/android-test-batching into .claude/skills/android-test-batching/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-test-batching", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/nwjs/chromium.src/tree/main/agents/skills/android-test-batching

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add nwjs/chromium.src --skill android-test-batching -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install nwjs/chromium.src android-test-batching --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .agents/skills && cp -r skills-src/agents/skills/android-test-batching .agents/skills/android-test-batching && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "android-test-batching" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/android-test-batching into .agents/skills/android-test-batching/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-test-batching", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nwjs/chromium.src --skill android-test-batching -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install nwjs/chromium.src android-test-batching --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/agents/skills/android-test-batching .cursor/skills/android-test-batching && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "android-test-batching" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/android-test-batching into .cursor/skills/android-test-batching/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-test-batching", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/nwjs/chromium.src.git --path agents/skills/android-test-batching

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add nwjs/chromium.src --skill android-test-batching -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install nwjs/chromium.src android-test-batching --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/agents/skills/android-test-batching .gemini/skills/android-test-batching && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "android-test-batching" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/android-test-batching into .gemini/skills/android-test-batching/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-test-batching", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install nwjs/chromium.src android-test-batching

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add nwjs/chromium.src --skill android-test-batching -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .github/skills && cp -r skills-src/agents/skills/android-test-batching .github/skills/android-test-batching && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "android-test-batching" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/android-test-batching into .github/skills/android-test-batching/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-test-batching", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nwjs/chromium.src --skill android-test-batching -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install nwjs/chromium.src android-test-batching --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/agents/skills/android-test-batching .opencode/skills/android-test-batching && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "android-test-batching" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/android-test-batching into .opencode/skills/android-test-batching/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "android-test-batching", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: android-test-batching
GitHub stars: 160
Token cost: ~1.3k tokens
SKILL.md length: 361 words
Files: 2
Skills in repo: 64
Repo updated: Oct 3, 2026
First seen: Oct 8, 2026
Licence: BSD-3-Clause

At a glance

Guide for auditing and applying batching annotations (@Batch) and AutoReset rules (AutoResetCtaTransitTestRule) to Android javatests in Chromium.

Works in 8 steps: Inspect Existing Annotations & Rules → Adding Annotations & Activity Rules → API Adaptations & Code Caveats → …
Optimizing Java instrumentation test runtimes
SKILL.md covers Core Invariants, Cleaning Up State Bleed Across… and Test Verification
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Android Test Batching is an agent skill from nwjs/chromium.src. Guide for auditing and applying batching annotations (@Batch) and AutoReset rules (AutoResetCtaTransitTestRule) to Android javatests in Chromium. Use this skill when optimizing Java instrumentation test runtimes, resolving test state leaks, or migrating tests to batched execution.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.

It sits in Mobile. It works with Android and Java. The repository describes itself as: Chromium codebase with NW.js modifications. Based on https://chromium.googlesource.com/chromium/src.git. The licence is BSD-3-Clause.

When your agent uses it

Optimizing Java instrumentation test runtimes
Resolving test state leaks
Migrating tests to batched execution

Example prompts

“/android-test-batching”

Workflow steps

8 steps, taken from the step headings in SKILL.md.

Inspect Existing Annotations & Rules
Adding Annotations & Activity Rules
API Adaptations & Code Caveats
Finishing Stray Non-ChromeActivity Instances
Clearing Snackbar Bleed
Clearing Dialog Bleed
Adding ForTesting() Reset Methods
When to Use @DoNotBatch

What it can do on your machine

Read from SKILL.md and the folder at commit a9e8946. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are java and bash).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Android Test Batching loads about 1.3k tokens when it runs. Until then it costs about 76 tokens; SKILL.md has 361 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~76
When it runs · the whole SKILL.md, loaded when a task matches: ~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from nwjs/chromium.src at commit a9e8946, republished under its BSD-3-Clause licence (© nwjs). 361 words, ~1,304 tokens.

Download SKILL.mdSave it as .claude/skills/android-test-batching/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: android-test-batching
description: Guide for auditing and applying batching annotations (@Batch) and AutoReset rules (AutoResetCtaTransitTestRule) to Android javatests in Chromium. Use this skill when optimizing Java instrumentation test runtimes, resolving test state leaks, or migrating tests to batched execution.

Android Instrumentation Test Batching Guide

This skill provides step-by-step instructions for auditing, batching, and migrating Chromium Android instrumentation tests (javatests) to @Batch(Batch.PER_CLASS) and AutoResetCtaTransitTestRule.

Core Invariants

AutoReset requires @Batch: AutoResetCtaTransitTestRule (ChromeTransitTestRules.fastAutoResetCtaActivityRule()) is only useful when @Batch annotations are present. Without @Batch, the Android test runner restarts the browser process between test methods anyway, rendering AutoReset ineffective.
@Batch is useful independently of AutoReset: @Batch(Batch.PER_CLASS) avoids test runner restarts across test methods.

1. Inspect Existing Annotations & Rules

Check the test class for existing annotations:
- If @DoNotBatch is present, inspect the documented reason before modifying.
- If @Batch is already present, check if FreshCtaTransitTestRule can be upgraded to AutoResetCtaTransitTestRule.

2. Adding Annotations & Activity Rules

Add @Batch(Batch.PER_CLASS) to the class definition.

Prefer AutoResetCtaTransitTestRule over FreshCtaTransitTestRule for faster execution:

java

// Change:
@Rule
public FreshCtaTransitTestRule mActivityTestRule =
        ChromeTransitTestRules.freshChromeTabbedActivityRule();

// To:
@Rule
public AutoResetCtaTransitTestRule mActivityTestRule =
        ChromeTransitTestRules.fastAutoResetCtaActivityRule();

3. API Adaptations & Code Caveats

startOnUrl vs startOnWebPage: FreshCtaTransitTestRule.startOnUrl(url) does not exist on AutoResetCtaTransitTestRule. Replace calls with mActivityTestRule.startOnWebPage(mTestServer.getURL(url)) or mActivityTestRule.startOnWebPage(url).
FreshCta-Specific Methods: Methods like skipWindowAndTabStateCleanup() in tearDown() are specific to FreshCtaTransitTestRule. Keep FreshCtaTransitTestRule if such cleanup overrides are required.

Cleaning Up State Bleed Across Batched Tests

State bleed across consecutive test methods in a batch can stem from various sources. Below are common, non-exhaustive examples and cleanup mechanisms to attempt before giving up or resorting to @DoNotBatch:

Show full SKILL.md (159 more words)Show less

1. Finishing Stray Non-ChromeActivity Instances

If secondary or settings activities launched during a test method linger into subsequent test runs:

java

ThreadUtils.runOnUiThreadBlocking(() -> {
    for (Activity activity : ApplicationStatus.getRunningActivities()) {
        if (!(activity instanceof ChromeTabbedActivity) && !activity.isFinishing()) {
            activity.finish();
        }
    }
});

Or use ApplicationTestUtils.finishActivity(activity).

2. Clearing Snackbar Bleed

If snackbars shown in one test method leak into subsequent tests:

java

ThreadUtils.runOnUiThreadBlocking(() -> {
    SnackbarManager snackbarManager = mSnackbarManagerSupplier.get();
    if (snackbarManager != null) {
        snackbarManager.dismissAllSnackbars();
    }
});

3. Clearing Dialog Bleed

If modal dialogs remain open across tests:

java

ThreadUtils.runOnUiThreadBlocking(() -> {
    ModalDialogManager modalDialogManager = mModalDialogManagerSupplier.get();
    if (modalDialogManager != null && modalDialogManager.isShowing()) {
        modalDialogManager.dismissAllDialogs(DialogDismissalCause.UNKNOWN);
    }
});

4. Adding `ForTesting()` Reset Methods

If production components or singletons retain state across test methods, add explicit reset methods to production or test helper classes:

java

// Example in production/helper component:
public static void resetForTesting() {
    sInstance = null;
    // Clear static observers or registered handlers
}

// Invoke in test @After or @Before:
@After
public void tearDown() {
    MySingletonComponent.resetForTesting();
}

5. When to Use `@DoNotBatch`

Only annotate with @DoNotBatch(reason = "<detailed reason>") if process-level state persists that cannot be easily reset via ForTesting() methods, cleanup utilities, or test rules.

Test Verification

Verify the batched test suite using autotest.py:

bash

./tools/autotest.py -C out/<build_dir> <filepath> --avd-config <avd_config_path>

[!TIP] Finding AVD Configs: It is strongly encouraged to pass --avd-config when running non-JUnit Android tests. Available emulator configurations can be found by inspecting the files in tools/android/avd/proto/ (e.g. tools/android/avd/proto/android_36_google_apis_x64.textpb). Ensure all test methods pass sequentially in a single run without hanging or failing due to state bleed.

Files

SKILL.md and 1 other file in agents/skills/android-test-batching of nwjs/chromium.src.

SKILL.md
OWNERS

Open the folder on GitHubat commit a9e8946

Compare with similar skills

Android Test Batching next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Android Test Batching compared with similar skills
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Android API Diffgkd-kit/gkd	43k	—	~796	Automated safety check: Pass	GPL-3.0	yesterday
Frb Android Emulator Preparefzyzcjy/flutter_rust_bridge	5.4k	—	~2.1k	Automated safety check: Notes	MIT	today
Android Maps Ktxgooglemaps/android-maps-ktx	360	—	~897	Automated safety check: Pass	Apache-2.0	today
Android Audio E2Ehyochan/react-native-nitro-sound	961	—	~814	Automated safety check: Pass	MIT	8 days ago
Project Binding Adapter From SourceafkT/DevUtils	1.6k	—	~1.6k	Automated safety check: Pass	Apache-2.0	1 mo ago

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Works with

Questions about Android Test Batching

What does Android Test Batching do?

Guide for auditing and applying batching annotations (@Batch) and AutoReset rules (AutoResetCtaTransitTestRule) to Android javatests in Chromium. src. Guide for auditing and applying batching annotations (@Batch) and AutoReset rules (AutoResetCtaTransitTestRule) to Android javatests in Chromium.

When should I use Android Test Batching?

Android Test Batching fits situations like: optimizing Java instrumentation test runtimes; resolving test state leaks; migrating tests to batched execution.

How do I install Android Test Batching in Claude Code?

Run `npx skills add nwjs/chromium.src --skill android-test-batching -a claude-code`. Or copy the skill folder (agents/skills/android-test-batching in nwjs/chromium.src) into .claude/skills/android-test-batching in your project. Claude Code loads it when a task matches its description.

How do I install Android Test Batching in Codex?

Run `npx skills add nwjs/chromium.src --skill android-test-batching -a codex`. Or copy the skill folder (agents/skills/android-test-batching in nwjs/chromium.src) into .agents/skills/android-test-batching in your project. Codex loads it when a task matches its description.

Can I use Android Test Batching in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add nwjs/chromium.src --skill android-test-batching -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/android-test-batching, .gemini/skills/android-test-batching, .github/skills/android-test-batching and .opencode/skills/android-test-batching in your project.

What does Android Test Batching need to run?

SKILL.md names no scripts, command-line tools or credentials: Android Test Batching is instructions for the agent only.

Does Android Test Batching access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Android Test Batching safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Android Test Batching use?

Android Test Batching is published under the BSD-3-Clause licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Android Test Batching use?

About 1.3k tokens (SKILL.md is roughly 5.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Android Test Batching?

Skills that share tags, products or a category with Android Test Batching: Android API Diff (gkd-kit/gkd, 43k stars), Frb Android Emulator Prepare (fzyzcjy/flutter_rust_bridge, 5.4k stars), Android Maps Ktx (googlemaps/android-maps-ktx, 360 stars) and Android Audio E2E (hyochan/react-native-nitro-sound, 961 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Android Test Batching?

nwjs (a GitHub organization) maintains it in nwjs/chromium.src, which has 160 GitHub stars. The repository holds 64 skills in this directory. The repository was last updated on October 3, 2026.

Source: nwjs/chromium.src on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Android Test Batching

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Android Instrumentation Test Batching Guide

Core Invariants

1. Inspect Existing Annotations & Rules

2. Adding Annotations & Activity Rules

3. API Adaptations & Code Caveats

Cleaning Up State Bleed Across Batched Tests

1. Finishing Stray Non-ChromeActivity Instances

2. Clearing Snackbar Bleed

3. Clearing Dialog Bleed

4. Adding ForTesting() Reset Methods

5. When to Use @DoNotBatch

Test Verification

Files

Compare with similar skills

Similar skills

More from nwjs/chromium.src

Related

Questions about Android Test Batching

4. Adding `ForTesting()` Reset Methods

5. When to Use `@DoNotBatch`