Test Writer

Name: test
Rating: 92
Author: eygraber

Generate comprehensive tests following project patterns and conventions.

Usage

code

/test MyModel.kt                  # Auto-detect test type from file
/test model MyModel.kt            # Generate Model tests (6 patterns)
/test flow DataSource.kt          # Generate Flow/Turbine tests
/test intent MyScreenView.kt      # Generate Intent emission tests
/test onintent MyCompositor.kt    # Generate OnIntent handling tests
/test repository MyRepository.kt  # Generate repository tests
/test unit MyHelper.kt            # Generate basic unit tests

For screenshot tests, use /screenshot-tests skill.

Test Types

Type	Focus
`model`	MVI Model state, business logic
`flow`	Reactive streams with Turbine
`intent`	UI interaction → Intent emission
`onintent`	Compositor Intent handling
`repository`	Data layer coordination
`unit`	Simple utilities, helpers

Auto-Detection

When no type specified, detect from file:

File Pattern	Test Type
`*Model.kt`	model
`*Compositor.kt`	onintent
`*View.kt`	intent
`*Repository.kt`	repository
`Source.kt`, `Flow.kt`	flow
Other	unit

Process

•Read the source file to understand what needs testing
•Identify the appropriate test type and pattern
•Find existing tests and fakes in the module
•Generate tests following the pattern
•Run tests to verify they pass
•Fix any compilation or test failures

Core Conventions

Test Structure (AAA)

kotlin

@Test
fun `descriptive name with backticks`() {
  // Arrange - set up test state
  val subject = createSubject()

  // Act - perform the action
  val result = subject.doSomething()

  // Assert - verify outcome
  result shouldBe expected
}

Naming

•Use backticks for readable test names
•Describe behavior: when X happens, then Y
•Be specific about conditions and outcomes

Fakes Over Mocks

kotlin

// GOOD: Fake with controllable behavior
class FakeRepository : MyRepository {
  var dataToReturn: Data? = null
  var shouldFail = false

  override suspend fun getData() = when {
    shouldFail -> JellyfinResult.Failure(Exception())
    else -> JellyfinResult.Success(dataToReturn!!)
  }
}

// BAD: Avoid MockK unless absolutely necessary

Assertions (Kotest)

kotlin

result shouldBe expected
result shouldNotBe null
list shouldContain item
list shouldHaveSize 3

Test Location

code

src/test/kotlin/           # Unit, Model, Flow, OnIntent tests
  com/eygraber/jellyfin/...
    RealMyModelTest.kt     # Test Real* implementations
    FakeMyRepository.kt    # Fakes for testing

Running Tests

bash

./gradlew :module:testDebugUnitTest     # Run module tests
./gradlew testDebugUnitTest             # Run all tests
./check                                  # Full quality suite

Documentation

•.docs/testing/ - Complete testing guide