test(replay): read a logged load divergence of None, as the plan now logs it when divergence is off

The logging now writes the divergence exactly as the plan uses it, which is None when metric_load_divergence_enable
is off. The replay applied the rounded percentage line instead, giving the plan a divergence live never used.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: chalfontchubby

apps/predbat/tests/replay_forward.py

@@ -46,7 +46,7 @@
 INDAY_RE = re.compile(r"in-day adjustment ([\d.]+)%")
 DIVERGENCE_RE = re.compile(r"Load divergence over .* divergence ([\d.]+)%")
 # The divergence fraction exactly as get_load_divergence() returns it, which the rounded percentage above can miss
-DIVERGENCE_EXACT_RE = re.compile(r"Replay input: load divergence ([\d.e+-]+)$")
+DIVERGENCE_EXACT_RE = re.compile(r"Replay input: load divergence ([\d.e+-]+|None)$")
 FILTERED_RE = re.compile(r"Export windows filtered (\[.*\])")
 NEXT_LIMIT_RE = re.compile(r"Next export window will be: .* at reserve \((\d+), (\w+), ([\d.]+)\)")
 VERSION_RE = re.compile(r"version (\S+) currently running")
@@ -480,7 +480,8 @@ def apply_run(my_predbat, prev, run):
     # at the log's 5-minute resolution - smoother than the live 1-minute history, so it comes out different.
     # Use the logged value instead; it is rounded to 2 dp of the fraction exactly as get_load_divergence returns it.
     if run.get("divergence_exact"):
-        my_predbat.replay_load_divergence = float(run["divergence_exact"])
+        # None when the live plan had divergence off, which the rounded percentage line does not show
+        my_predbat.replay_load_divergence = None if run["divergence_exact"] == "None" else float(run["divergence_exact"])
     elif run.get("divergence"):
         my_predbat.replay_load_divergence = round(float(run["divergence"]) / 100.0, 2)
     apply_logged_state(my_predbat, run.get("state"))

apps/predbat/tests/test_replay_forward.py

@@ -749,6 +749,12 @@ def test_inverter_input():
     if bat.replay_load_divergence != 0.31:
         print("ERROR: the exact divergence should win over the rounded percentage: {}".format(bat.replay_load_divergence))
         return 1
+    # Divergence off live: the plan used None, whatever the rounded percentage line says
+    off = dict(runs[0], divergence_exact="None")
+    apply_run(bat, {"today": None, "force": None, "time": "2026-10-05 23:30:00+01:00"}, off)
+    if bat.replay_load_divergence is not None:
+        print("ERROR: a logged None divergence should be applied as None, got {}".format(bat.replay_load_divergence))
+        return 1
     return 0