Test coverage: event handling (cross, above, timer)

[robtaylor]

Summary

Analog event control statements have limited test coverage, and some are documented as not yet implemented.

Current Status

From documentation:

• @(initial_step), @(final_step) - supported
• Named events (@foo) - not supported
• Monitored events (@(cross(...))) - not supported
• Or events - not supported

Missing Test Coverage

Even for supported events, dedicated tests are limited:

Supported features needing tests

• @(initial_step) - Basic and conditional usage
• @(final_step) - Cleanup/finalization code
• Multiple initial_step blocks in same module

Features to test when implemented

• cross(expr, direction) - Zero crossing detection
• above(expr, threshold) - Threshold crossing
• Timer events

Current State

• No dedicated test files for event handling in openvaf/test_data/
• Events may be tested indirectly through integration tests

Suggested Action

1. Add explicit tests for initial_step and final_step behavior
2. Add UI tests for proper error messages when unsupported events are used
3. When implementing new events, add comprehensive tests