otel: Testing Infrastructure

[schloerke]

Goal: Add comprehensive tests for OTel functionality with > 90% coverage.

Tasks

• Create tests/pytest/test_otel_utils.py with fixtures:
  • in_memory_exporter - Capture spans/logs for assertions
  • with_otel_sdk - Context manager to enable OTel for tests
  • assert_span_exists(name, attributes) - Helper for assertions
• Create tests/pytest/test_otel_session.py to test:
  • Session start span with correct attributes
  • Session end span
  • Collection level controls span creation
  • Session ID included in spans
• Create tests/pytest/test_otel_reactive.py to test:
  • Reactive flush creates update span
  • Calc/Effect execution creates child spans
  • Span nesting (update → calc/effect)
  • Label generation
  • Source attribute extraction
• Create tests/pytest/test_otel_collect.py to test:
  • Environment variable controls default level
  • Context manager overrides
  • Decorator overrides
  • Nested context managers
• Create tests/pytest/test_otel_async.py to test:
  • Spans propagate through async boundaries
  • Concurrent reactive executions maintain correct context
  • Extended tasks maintain span context

Acceptance Criteria

• All tests pass
• Coverage > 90% for shiny/otel/ code
• Tests verify span structure, attributes, and nesting
• Tests verify context propagation in async scenarios
• Tests verify collection level controls work correctly
• Tests verify error recording and sanitization

Files to Create

• tests/pytest/test_otel_utils.py
• tests/pytest/test_otel_session.py
• tests/pytest/test_otel_reactive.py
• tests/pytest/test_otel_collect.py
• tests/pytest/test_otel_async.py