Unit Testing

Basic functionality tests using Vitest and @internals/testing utilities.

Key Patterns:

• Use createFixture and removeFixture for DOM setup/teardown
• Wait for element stability with elementIsStable
• Test element definition, properties, attributes, and events

Example:

Testing Utilities

@internals/testing

Core testing utilities for DOM manipulation and element stability:

• createFixture: Creates test fixture DOM element
• removeFixture: Removes test fixture DOM
• elementIsStable: Waits for Lit element to be stable
• emulateClick: Triggers native click events
• untilEvent: Creates promise for event results

Running Tests

Run test scripts from the root directory of the project where the package.json lives.