feat(scenarios): add meter-value-zero scenario

.changeset/brave-pandas-count.md

@@ -0,0 +1,5 @@
+---
+'@ocpp-debugkit/toolkit': patch
+---
+
+Add a meter-value-zero scenario to ensure a flat zero meter register does not report a failure.

README.md

@@ -22,7 +22,7 @@ validate behavior against known scenarios.
   firmware update failures, suspicious session duration, slow CSMS responses,
   heartbeat interval violations, meter value anomalies, unresponsive CSMS, and
   repeated boot notifications.
-- **Scenario Evaluator** — 19 predefined scenarios with expected failure
+- **Scenario Evaluator** — 20 predefined scenarios with expected failure
   outcomes for testing the analysis engine. Supports external scenario files.
 - **Replay Engine** — Deterministic, pure replay engine with step forward/back,
   jump-to-event, and configurable playback speed.

packages/toolkit/README.md

@@ -20,7 +20,7 @@ report generation, React components, and CLI.
   firmware update failures, suspicious session duration, slow CSMS responses,
   heartbeat interval violations, meter value anomalies, unresponsive CSMS, and
   repeated boot notifications.
-- **Scenario Evaluator** — 19 predefined scenarios with expected failure
+- **Scenario Evaluator** — 20 predefined scenarios with expected failure
   outcomes for testing the analysis engine. Supports external scenario files.
 - **Replay Engine** — Deterministic, pure replay engine with step forward/back,
   jump-to-event, and configurable playback speed. No timers or I/O.

packages/toolkit/src/scenarios/__scenarios__/meter-value-zero.ts

@@ -0,0 +1,163 @@
+export default {
+  name: 'meter-value-zero',
+  description:
+    'Transaction with a flat zero meter register throughout. A zero reading is a valid negative control and must not trigger METER_VALUE_ANOMALY.',
+  trace: {
+    traceId: 'scenario-meter-value-zero',
+    metadata: {
+      stationId: 'CS-SYNTHETIC-021',
+      ocppVersion: '1.6',
+      source: 'synthetic-scenario',
+      description:
+        'Station completes a four-minute transaction while the cumulative energy register remains at zero.',
+    },
+    events: [
+      {
+        timestamp: '2026-01-15T09:00:00.000Z',
+        direction: 'CS_TO_CSMS',
+        message: [
+          2,
+          'msg-001',
+          'BootNotification',
+          {
+            chargePointVendor: 'SyntheticVendor',
+            chargePointModel: 'SM-100',
+            chargePointSerialNumber: 'CS-SYNTHETIC-021',
+            firmwareVersion: '1.0.0',
+          },
+        ],
+      },
+      {
+        timestamp: '2026-01-15T09:00:00.500Z',
+        direction: 'CSMS_TO_CS',
+        message: [
+          3,
+          'msg-001',
+          { currentTime: '2026-01-15T09:00:00.500Z', interval: 300, status: 'Accepted' },
+        ],
+      },
+      {
+        timestamp: '2026-01-15T09:00:30.000Z',
+        direction: 'CS_TO_CSMS',
+        message: [2, 'msg-002', 'Authorize', { idTag: 'SYNTHETIC-TAG-021' }],
+      },
+      {
+        timestamp: '2026-01-15T09:00:30.500Z',
+        direction: 'CSMS_TO_CS',
+        message: [3, 'msg-002', { idTagInfo: { status: 'Accepted' } }],
+      },
+      {
+        timestamp: '2026-01-15T09:01:00.000Z',
+        direction: 'CS_TO_CSMS',
+        message: [
+          2,
+          'msg-003',
+          'StartTransaction',
+          { connectorId: 1, idTag: 'SYNTHETIC-TAG-021', meterStart: 0 },
+        ],
+      },
+      {
+        timestamp: '2026-01-15T09:01:00.500Z',
+        direction: 'CSMS_TO_CS',
+        message: [3, 'msg-003', { idTagInfo: { status: 'Accepted' }, transactionId: 100021 }],
+      },
+      {
+        timestamp: '2026-01-15T09:02:00.000Z',
+        direction: 'CS_TO_CSMS',
+        message: [
+          2,
+          'msg-004',
+          'MeterValues',
+          {
+            connectorId: 1,
+            transactionId: 100021,
+            meterValue: [
+              {
+                sampledValue: [
+                  { value: '0', measurand: 'Energy.Active.Import.Register', unit: 'Wh' },
+                ],
+              },
+            ],
+          },
+        ],
+      },
+      {
+        timestamp: '2026-01-15T09:02:00.500Z',
+        direction: 'CSMS_TO_CS',
+        message: [3, 'msg-004', {}],
+      },
+      {
+        timestamp: '2026-01-15T09:03:00.000Z',
+        direction: 'CS_TO_CSMS',
+        message: [
+          2,
+          'msg-005',
+          'MeterValues',
+          {
+            connectorId: 1,
+            transactionId: 100021,
+            meterValue: [
+              {
+                sampledValue: [
+                  { value: '0', measurand: 'Energy.Active.Import.Register', unit: 'Wh' },
+                ],
+              },
+            ],
+          },
+        ],
+      },
+      {
+        timestamp: '2026-01-15T09:03:00.500Z',
+        direction: 'CSMS_TO_CS',
+        message: [3, 'msg-005', {}],
+      },
+      {
+        timestamp: '2026-01-15T09:04:00.000Z',
+        direction: 'CS_TO_CSMS',
+        message: [
+          2,
+          'msg-006',
+          'MeterValues',
+          {
+            connectorId: 1,
+            transactionId: 100021,
+            meterValue: [
+              {
+                sampledValue: [
+                  { value: '0', measurand: 'Energy.Active.Import.Register', unit: 'Wh' },
+                ],
+              },
+            ],
+          },
+        ],
+      },
+      {
+        timestamp: '2026-01-15T09:04:00.500Z',
+        direction: 'CSMS_TO_CS',
+        message: [3, 'msg-006', {}],
+      },
+      {
+        timestamp: '2026-01-15T09:05:00.000Z',
+        direction: 'CS_TO_CSMS',
+        message: [
+          2,
+          'msg-007',
+          'StopTransaction',
+          {
+            transactionId: 100021,
+            idTag: 'SYNTHETIC-TAG-021',
+            meterStop: 0,
+            reason: 'Local',
+          },
+        ],
+      },
+      {
+        timestamp: '2026-01-15T09:05:00.500Z',
+        direction: 'CSMS_TO_CS',
+        message: [3, 'msg-007', { idTagInfo: { status: 'Accepted' } }],
+      },
+    ],
+  },
+  expectedFailures: [],
+  assertions: [{ type: 'no_failures', params: {} }],
+};

packages/toolkit/src/scenarios/index.test.ts

@@ -22,6 +22,7 @@ import {
   firmwareUpdateFailureScenario,
   refusedAuthorizationScenario,
   heartbeatTimeoutScenario,
+  meterValueZeroScenario,
 } from './index.js';
 import { parseTrace, buildSessionTimeline, detectFailures } from '../core/index.js';
 
@@ -30,8 +31,8 @@ import { parseTrace, buildSessionTimeline, detectFailures } from '../core/index.
 // ---------------------------------------------------------------------------
 
 describe('scenario registry', () => {
-  it('exports exactly 19 scenarios', () => {
-    expect(scenarios).toHaveLength(19);
+  it('exports exactly 20 scenarios', () => {
+    expect(scenarios).toHaveLength(20);
   });
 
   it('exports scenario names in order', () => {
@@ -55,6 +56,7 @@ describe('scenario registry', () => {
       'firmware-update-failure',
       'refused-authorization',
       'heartbeat-timeout',
+      'meter-value-zero',
     ]);
   });
 
@@ -87,6 +89,7 @@ describe('scenario registry', () => {
     expect(getScenario('firmware-update-failure')).toBe(firmwareUpdateFailureScenario);
     expect(getScenario('refused-authorization')).toBe(refusedAuthorizationScenario);
     expect(getScenario('heartbeat-timeout')).toBe(heartbeatTimeoutScenario);
+    expect(getScenario('meter-value-zero')).toBe(meterValueZeroScenario);
   });
 
   it('getScenario returns undefined for unknown name', () => {
@@ -242,6 +245,14 @@ describe('scenario engine integration', () => {
     const failures = detectFailures(result.events, sessions);
     expect(failures.some((f) => f.code === 'TIMEOUT_NO_HEARTBEAT')).toBe(true);
   });
+
+  it('meter-value-zero: no failures detected', () => {
+    const trace = JSON.stringify(meterValueZeroScenario.trace);
+    const result = parseTrace(trace);
+    const sessions = buildSessionTimeline(result.events);
+    const failures = detectFailures(result.events, sessions);
+    expect(failures).toHaveLength(0);
+  });
 });
 
 // ---------------------------------------------------------------------------

packages/toolkit/src/scenarios/index.ts

@@ -24,6 +24,7 @@ import firmwareUpdateSuccess from './__scenarios__/firmware-update-success.js';
 import firmwareUpdateFailure from './__scenarios__/firmware-update-failure.js';
 import refusedAuthorization from './__scenarios__/refused-authorization.js';
 import heartbeatTimeout from './__scenarios__/heartbeat-timeout.js';
+import meterValueZero from './__scenarios__/meter-value-zero.js';
 
 // ---------------------------------------------------------------------------
 // Scenarios derived from core fixtures
@@ -74,6 +75,7 @@ const firmwareUpdateSuccessScenario: Scenario = firmwareUpdateSuccess as unknown
 const firmwareUpdateFailureScenario: Scenario = firmwareUpdateFailure as unknown as Scenario;
 const refusedAuthorizationScenario: Scenario = refusedAuthorization as unknown as Scenario;
 const heartbeatTimeoutScenario: Scenario = heartbeatTimeout as unknown as Scenario;
+const meterValueZeroScenario: Scenario = meterValueZero as unknown as Scenario;
 
 // ---------------------------------------------------------------------------
 // Registry
@@ -99,6 +101,7 @@ export const scenarios = [
   firmwareUpdateFailureScenario,
   refusedAuthorizationScenario,
   heartbeatTimeoutScenario,
+  meterValueZeroScenario,
 ] as const;
 
 export const scenarioNames = [
@@ -121,6 +124,7 @@ export const scenarioNames = [
   'firmware-update-failure',
   'refused-authorization',
   'heartbeat-timeout',
+  'meter-value-zero',
 ] as const;
 
 export {
@@ -143,6 +147,7 @@ export {
   firmwareUpdateFailureScenario,
   refusedAuthorizationScenario,
   heartbeatTimeoutScenario,
+  meterValueZeroScenario,
 };
 
 export { compareScenarioReports } from './compare.js';

tests/external-fixture/test.mjs

@@ -158,8 +158,8 @@ const scenarios = await import('@ocpp-debugkit/toolkit/scenarios');
 
 assert(Array.isArray(scenarios.scenarios), 'scenarios is an array');
 assert(
-  scenarios.scenarios.length === 19,
-  `19 scenarios exported (got ${scenarios.scenarios.length})`,
+  scenarios.scenarios.length === 20,
+  `20 scenarios exported (got ${scenarios.scenarios.length})`,
 );
 assert(typeof scenarios.getScenario === 'function', 'getScenario is a function');
 assert(scenarios.getScenario('normal-session') !== undefined, 'normal-session scenario exists');