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+"""Unit tests for slot-preset key derivation.
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+
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+Regression coverage for #1053: the backend's get_slot_presets response
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+must use the same keying scheme as the frontend's getGlobalTrayId
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+(amsHelpers.ts) so that AMS-HT mappings round-trip correctly.
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+"""
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+
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+from backend.app.api.routes.printers import _slot_preset_key
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+
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+
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+def test_regular_ams_uses_global_tray_id():
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+ assert _slot_preset_key(0, 0) == 0
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+ assert _slot_preset_key(0, 3) == 3
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+ assert _slot_preset_key(1, 1) == 5
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+ assert _slot_preset_key(2, 2) == 10
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+ assert _slot_preset_key(3, 3) == 15
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+
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+
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+def test_ams_ht_keyed_by_ams_id():
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+ # AMS-HT is single-slot and shares its global tray id with the unit id;
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+ # frontend getGlobalTrayId(amsId, 0, false) returns amsId for 128-135.
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+ assert _slot_preset_key(128, 0) == 128
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+ assert _slot_preset_key(129, 0) == 129
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+ assert _slot_preset_key(135, 0) == 135
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+
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+
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+def test_external_spool_uses_multiplied_id():
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+ # External (ams_id=255) matches PrintersPage lookup: 255 * 4 + tray_id.
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+ assert _slot_preset_key(255, 0) == 1020
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+ assert _slot_preset_key(255, 1) == 1021
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maziggy