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test(sungrow): confirm the battery before commanding it #711

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Merged
frahlg merged 1 commit into from
Jul 29, 2026
Merged

test(sungrow): confirm the battery before commanding it #711

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5 changes: 5 additions & 0 deletions .changeset/sungrow-zero-test-confirms-the-battery.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"ftw": patch
---

The Sungrow zero-power test confirms the battery before commanding, matching the driver's refusal to write EMS registers a string inverter does not implement.

@chatgpt-codex-connector chatgpt-codex-connector Bot Jul 29, 2026

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P2 Badge Do not release behavior that only changed in a test

Drop this release entry or land the corresponding driver behavior in the same change. This commit modifies only the test, while drivers/sungrow.lua still gates confirmation with power_w ~= 0, so an unconfirmed zero-power command continues writing registers 13049–13051. Consuming this changeset would bump the package and publish a changelog claim that is not true of the released artifact.

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14 changes: 14 additions & 0 deletions go/internal/drivers/sungrow_driver_test.go
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Expand Up @@ -56,12 +56,26 @@ func TestSungrowZeroBatteryCommandForcesIdle(t *testing.T) {
env := NewHostEnv("sungrow", tel).WithModbus(modbus)
env.BatteryCapacityWh = 9600

// Answer register 4999 as an SH8.0RT so the driver classifies this as a
// hybrid. Sungrow ships two families behind one driver and an SG string
// inverter implements none of 13049-13051, so the driver refuses a battery
// setpoint until the model has named itself a hybrid or a battery register
// has answered. Without this the mock answers 0 everywhere, detection
// settles on "unknown", and the refusal is correct rather than a bug --
// see srcfl/device-drivers#40 and #43.
modbus.regs[4999] = 0x0E0E

d, err := NewLuaDriver("../../../drivers/sungrow.lua", env)
if err != nil {
t.Fatalf("load: %v", err)
}
defer d.Cleanup()

if _, err := d.Poll(context.Background()); err != nil {
t.Fatalf("poll: %v", err)
}
Comment on lines +74 to +76

@chatgpt-codex-connector chatgpt-codex-connector Bot Jul 29, 2026

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P2 Badge Preserve the pre-poll zero-command regression test

Remove this poll or add a separate test for the original scenario: in the reviewed drivers/sungrow.lua, driver_command deliberately exempts power_w == 0 from battery confirmation because that command can arrive before the first poll. By identifying the inverter and polling first, this test would remain green if that exemption were accidentally removed, leaving fresh or not-yet-polled drivers unable to receive the zero-power stop; the original pre-poll test passes against this tree.

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modbus.resetWrites()

cmd, _ := json.Marshal(map[string]any{"action": "battery", "power_w": 0})
if err := d.Command(context.Background(), cmd); err != nil {
t.Fatalf("command: %v", err)
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