The eeschema-ground-truth fixture (_build_mirror_case) passed
'mirror': 'x' to ComponentManager.add_component, which silently drops
the kwarg — so the resulting .kicad_sch had no (mirror x|y) token,
eeschema rendered an unmirrored symbol, and our pin coords (also
unmirrored) tautologically matched. The mirror tests were GREEN both
before and after the rotation/mirror fix in 7e67cb9, providing zero
regression coverage for the mirror semantics.
Fix:
- _build_mirror_case now applies the mirror via the same low-level
helper (WireDragger.update_symbol_rotation_mirror) that
rotate_schematic_component uses, with a guard assertion that the
written file actually contains (mirror x|y).
- Two new pin-down unit tests in test_add_schematic_component.py
document and lock down ComponentManager.add_component's silent-drop
behavior for mirror, so the next person to touch that path knows to
update the eeschema-truth fixture if they grow real mirror support.
Verified: with the production fix at 7e67cb9 reverted, the kicad-cli
mirror tests now go RED (previously they stayed GREEN regardless).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
496be317e9