Unit tests

Unit tests validate isolated logic without requiring full application startup.

Scope

• Data model behavior in src/js/model/
• Service-level pure logic, especially prediction and formatting helpers
• Utility modules used by rendering and actions

Guidelines

• Cover normal inputs, edge cases, and invalid inputs.
• Mock browser-only dependencies (window, localStorage, speech APIs).
• Keep unit tests deterministic and independent of network state.

Priority Examples

• N-gram update and next-word ranking behavior
• Serialization/parsing of grid model objects
• Action payload generation for HTTP actions

Each test case should document inputs, expected outputs, and the reason the behavior matters for AAC usage.