idempotence zapisu 178 a 179 grid peak shaveing a grid cuttoff

backend/tests/test_drop_registers_matching_last_verified.py

@@ -0,0 +1,38 @@
+from services.control.exporter_monolith import (
+    REG178_PASSIVE,
+    _drop_registers_matching_last_verified,
+)
+
+
+def test_drop_registers_skips_reg178_when_mask_matches():
+    # last_verified contains extra bits beyond 0x0030; we still want to skip if bits 4–5 match.
+    registers = [(178, "grid_peak_shaving_switch", REG178_PASSIVE)]
+    last_verified = {178: 12030}  # real-world example from home-01 (bits4-5 still == 0b11)
+    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
+    assert out == []
+    assert skipped == [178]
+
+
+def test_drop_registers_keeps_reg178_when_mask_differs():
+    registers = [(178, "grid_peak_shaving_switch", REG178_PASSIVE)]
+    last_verified = {178: 32}  # SELL mask 0b10
+    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
+    assert out == registers
+    assert skipped == []
+
+
+def test_drop_registers_skips_reg179_when_mask_matches():
+    registers = [(179, "control_board_special_1", 2)]  # bits0–1 = 2 (cutoff ON)
+    last_verified = {179: 0x1236}  # ...0110b => bits0–1 still == 2
+    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
+    assert out == []
+    assert skipped == [179]
+
+
+def test_drop_registers_keeps_reg179_when_mask_differs():
+    registers = [(179, "control_board_special_1", 2)]  # want cutoff ON
+    last_verified = {179: 0x1237}  # ...0111b => bits0–1 == 3 (cutoff OFF)
+    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
+    assert out == registers
+    assert skipped == []
+