Create Unit Test

This skill guides the creation of unit tests to ensuring consistency and correctness.

Workflow

1. Analyze and Plan:

   • Goal: Understand what needs testing.
   • Action: Examine the source code.
   • Action: Identify "happy path" cases (core functionality).
   • Action: Identify "error cases" and "edge cases" based on likelihood.
   • Action: Do not suggest implementation details unless asked; focus on behavior.

2. Setup Test File:

   • Naming: [OriginalClassName]Test.kt.
   • Location: [module]/src/test/java/[package/path]/.
   • Runner: If testing Android components, you MUST use Robolectric.
   • Mocking: Prefer creating Fakes over Mocks or patches. Use Mocks only if Fakes are too complex.

3. Implement Tests:

   • Write clear, descriptive test methods.
   • Follow the "Arrange-Act-Assert" pattern.
   • Ensure all resources (strings, themes) are properly mocked or provided via Robolectric.

4. Run Tests:

   • Command: ./gradlew :[module]:testDebugUnitTest
   • Example: ./gradlew :database:testDebugUnitTest
   • Tip: Before any commit, run ./gradlew testDebugUnitTest to ensure everything passes.

5. Handle Failures:

   • Goal: Diagnose and fix issues.
   • Action: If a test fails, locate the full error report.
   • Path: [module]/build/test-results/testDebugUnitTest/TEST-[package.name.TestClassName].xml.
   • Example: app/build/test-results/testDebugUnitTest/TEST-com.anysoftkeyboard.janus.app.MainActivityTest.xml.

Guidelines

• Consistency: Always place tests in the test source set, not androidTest (unless specifically writing instrumentation tests, which is rare for this skill).
• Reliability: Avoid flaky tests. Ensure deterministic behavior.