---
name: android-testing-8e207e7b6b4e
description: Write Android unit, Compose UI, and Hilt-integrated tests. Use when designing test behavior with MockK or coroutine test utilities; defer database/WorkManager-specific recipes to the owning feature skill.
metadata:
  triggers:
    files:
    - '**/*Test.kt'
    - '**/*Rule.kt'
    keywords:
    - "@Test"
    - runTest
    - composeTestRule
    - HiltAndroidTest
    - MockK
    - createAndroidComposeRule
    - MainDispatcherRule
    - "@TestInstallIn"
---
# Android Testing Standards

## **Priority: P0 (CRITICAL)**

## The Four-Pillar Test Value Framework

Qualitative reasoning framework to evaluate unit test value:
- **Protection against Regressions**: Catches real defects; a test passing during failure offers zero protection.
- **Resistance to Refactoring**: Decoupled from internal implementation; zero false alarms on internal refactorings.
- **Fast Feedback**: Executes in milliseconds; rapid local TDD feedback loop.
- **Maintainability**: Clean AAA structure, high readability, zero boilerplate duplication.
Avoid inventing arbitrary numeric scores (e.g. P * R * F * M) statically without empirical measurement.

## Core Rule Anchors

- **`[MOB-TEST-01]` Tripartite Naming**: Name tests `Method_Scenario_ExpectedBehavior` (e.g. `submitOrder_whenCreditLimitExceeded_displaysBlockedBanner`).
- **`[MOB-TEST-02]` State & ViewModel Invariant Rule**: Assert UI state transitions (e.g. `StateFlow`/`UiState` via Turbine `test {}`); ban asserting 30-property boilerplate state copies.
- **`[MOB-TEST-03]` Entity Invariant & Serialization Rule**: Test calculations, validations, domain invariants, and non-trivial serialization/parsing or error mapping. Ban testing auto-generated code, trivial getters, or echo tests repeating literal assignments.
- **`[MOB-TEST-04]` Contract Testing Rule**: Repositories and data sources must be tested for contract compliance and error mapping. Ban 1:1 pass-through mock echoing (`coEvery { dataSource.get() } returns x; repo.get() == x`).
- **`[MOB-TEST-05]` Bug-First Regression Lock**: Every PR fixing a bug ticket or with title `fix(...)` must introduce a failing test reproducing the defect before fixing it.

## Implementation Guidelines

### Unit Tests
- **Scope & Async**: ViewModels, Usecases, Repositories, Utils. Use `runTest` with `MainDispatcherRule`. Mock with MockK or fakes.
- **Coverage**: Coverage is diagnostic and project-configured; verify risk-weighted critical paths rather than padding code for an arbitrary percentage.

### UI Integration Tests (Instrumentation)
- **Scope & DI**: Composable Screens, Navigation flows. Use `createAndroidComposeRule` + Hilt (`HiltAndroidRule`). Fake repositories via `@TestInstallIn`.
- **Negative Assertions**: Add negative assertions only when absence is part of the business contract.

## Anti-Patterns & Banned Smells

- **`[MOB-TEST-01]` Vague names**: Banish non-descriptive test names.
- **`[MOB-TEST-02]` Brittle state copies**: Ban asserting 30-property boilerplate state copies; use focused state assertions or Turbine.
- **`[MOB-TEST-03]` Echo tests**: Ban testing auto-generated code, trivial getters, or repeating literal assignments.
- **`[MOB-TEST-04]` Pass-through mock echoing**: Ban 1:1 pass-through mock echoing and shallow assertions without contract checks.
- **`[MOB-TEST-05]` Missing bug reproduction**: Ban bug fix PRs without reproduction tests.
- **No Real Network / Thread.sleep**: Fake repositories in DI; use IdlingResource or `composeTestRule.waitUntil` for async timing.

## References

- [Test Rules](references/implementation.md)


---
Source attribution: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Development & Engineering
Roles: Backend Developer, Mobile Developer, QA / Test Engineer
Specialties: Mobile, Testing
Tools: Mockk
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: c7c44ad880fcdd20d16ee988e02bb71a438d2dde6ce72908c9e638e437ddf3d2