What is media3-test-utils-robolectric?

A guide for testing Media3 playback with fake players, Robolectric, and Android tests. Robolectric runs many Android framework tests on the JVM without a physical device.

Use it for Media3 unit tests, Robolectric tests, fake playback state, controller or service tests, and deciding when an instrumented device test is required.

It helps keep tests deterministic and places each check at the right level. JVM tests can cover app state and service boundaries, while device tests handle codecs, DRM, renderers, surfaces, and real playback.

media3-test-utils-robolectric — Skill for Claude Code and Codex by sun

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.

Any agent

npx skills add sunnat629/android-media-pack --skill media3-test-utils-robolectric

Clone the repo

git clone --depth 1 https://github.com/sunnat629/android-media-pack

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sunnat629/android-media-pack/media3-test-utils-robolectric/github.svg)](https://agentmods.dev/skills/sunnat629/android-media-pack/media3-test-utils-robolectric)

Your own site

<a href="https://agentmods.dev/skills/sunnat629/android-media-pack/media3-test-utils-robolectric"><img src="https://agentmods.dev/badge/skills/sunnat629/android-media-pack/media3-test-utils-robolectric/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/sunnat629/android-media-pack/media3-test-utils-robolectric"><img src="https://agentmods.dev/badge/skills/sunnat629/android-media-pack/media3-test-utils-robolectric.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 440 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00032	$0.00440
Opus 5	$0.00016	$0.00220
Sonnet 5	$0.00006	$0.00088
Haiku 4.5	$0.00003	$0.00044

Measured 11d ago against content hash 71db0d88efde, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

media3-test-utils-robolectric 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 11d 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.

.skills/media/testing/media3-test-utils-robolectric/SKILL.md · 56 lines

What it actually says

Trigger

Use for Media3 unit tests, Robolectric tests, fake player state, controller/service tests, or adding media3-test-utils.

Rules

Pin Media3 to 1.10.1 through the version catalog.
Put JVM-only test helpers in testImplementation; put device/UI helpers in androidTestImplementation.
Test app media state, ownership, and failure behavior; do not over-test Media3 internals.
Prefer fake player/controller state for UI models and service boundaries.
Use Robolectric for Android framework behavior that does not need real codec/network hardware.
Use instrumented tests for decoder, DRM, renderer, surface, and real playback checks.
Keep sample media tiny, deterministic, and license-safe.

Example

media3-test-utils = { module = "androidx.media3:media3-test-utils", version.ref = "media3" }
media3-test-utils-robolectric = { module = "androidx.media3:media3-test-utils-robolectric", version.ref = "media3" }

assertThat(viewState.isPlaying).isFalse()
assertThat(viewState.errorMessage).isNull()

Do Not

Do not rely on remote media URLs in unit tests.
Do not run real DRM or codec assumptions in plain JVM tests.
Do not assert private Media3 implementation details.

media3-lifecycle-state
media3-background-playback-service
media3-analytics-telemetry

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.

11d ago First seen · 56 lines · 32 tokens per session scan A 71db0d88efde

Subscribe to this mod's changes

media3-test-utils-robolectric is a skill published in the GitHub repository sunnat629/android-media-pack (13 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 32 tokens to every session and 440 once invoked, about $0.0002 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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