Expose output format selectors in editor

Prevents demo code from executing when module is required by Node-RED,
which caused crashes due to missing measurement data.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pumpingStation.html

@@ -24,6 +24,8 @@
       heightInlet:    { value: 0.8 }, // m, centre of inlet pipe above floor
       heightOutlet:   { value: 0.2 }, // m, centre of outlet pipe above floor
       heightOverflow: { value: 0.9 }, // m, overflow elevation
+      processOutputFormat: { value: "process" },
+      dbaseOutputFormat: { value: "influxdb" },
 
       // Advanced reference information
       refHeight:      { value: "NAP" }, // reference height
@@ -163,6 +165,25 @@
     <input type="number" id="node-input-basinBottomRef" step="0.01" />
   </div>
 
+  <hr>
+  <h3>Output Formats</h3>
+  <div class="form-row">
+    <label for="node-input-processOutputFormat"><i class="fa fa-random"></i> Process Output</label>
+    <select id="node-input-processOutputFormat" style="width:60%;">
+      <option value="process">process</option>
+      <option value="json">json</option>
+      <option value="csv">csv</option>
+    </select>
+  </div>
+  <div class="form-row">
+    <label for="node-input-dbaseOutputFormat"><i class="fa fa-database"></i> Database Output</label>
+    <select id="node-input-dbaseOutputFormat" style="width:60%;">
+      <option value="influxdb">influxdb</option>
+      <option value="json">json</option>
+      <option value="csv">csv</option>
+    </select>
+  </div>
+
   <!-- Shared asset/logger/position menus -->
   <div id="asset-fields-placeholder"></div>
   <div id="logger-fields-placeholder"></div>

src/nodeClass.js

@@ -39,35 +39,20 @@ class nodeClass {
     const cfgMgr = new configManager();
     this.defaultConfig = cfgMgr.getConfig(this.name);
 
-    // Merge UI config over defaults
+    // Build config: base sections + pumpingStation-specific domain config
-    this.config = {
+    this.config = cfgMgr.buildConfig(this.name, uiConfig, node.id, {
-      general: {
+      basin: {
-        name: this.name,
-        id: node.id, // node.id is for the child registration process
-        unit: uiConfig.unit, // add converter options later to convert to default units (need like a model that defines this which units we are going to use and then conver to those standards)
-        logging: {
-          enabled: uiConfig.enableLog,
-          logLevel: uiConfig.logLevel
-        }
-      },
-      functionality: {
-        positionVsParent: uiConfig.positionVsParent,// Default to 'atEquipment' if not specified
-        distance: uiConfig.hasDistance ? uiConfig.distance : undefined
-      },
-      basin:{
         volume: uiConfig.basinVolume,
         height: uiConfig.basinHeight,
         heightInlet: uiConfig.heightInlet,
         heightOutlet: uiConfig.heightOutlet,
         heightOverflow: uiConfig.heightOverflow,
       },
-      hydraulics:{
+      hydraulics: {
         refHeight: uiConfig.refHeight,
         basinBottomRef: uiConfig.basinBottomRef,
       }
-    };
+    });
-
-    console.log(`position vs child for ${this.name} is ${this.config.functionality.positionVsParent} the distance is ${this.config.functionality.distance}`);
 
     // Utility for formatting outputs
     this._output = new outputUtils();
@@ -203,12 +188,13 @@ class nodeClass {
           this.source.handleInput(msg);
           break;
           */
-        case 'registerChild':
+        case 'registerChild': {
           // Register this node as a child of the parent node
           const childId = msg.payload;
           const childObj = this.RED.nodes.getNode(childId);
           this.source.childRegistrationUtils.registerChild(childObj.source ,msg.positionVsParent);
           break;
+        }
       }
       done();
     });

src/specificClass.js

@@ -1,5 +1,5 @@
 const EventEmitter = require('events');
-const {logger,configUtils,configManager,childRegistrationUtils,MeasurementContainer,coolprop,interpolation} = require('generalFunctions');
+const {logger,configUtils,configManager,childRegistrationUtils,MeasurementContainer,coolprop,interpolation, POSITIONS} = require('generalFunctions');
 
 class pumpingStation {
   constructor(config={}) {
@@ -41,9 +41,7 @@ class pumpingStation {
     //define what to do with measurements
     if(softwareType === "measurement"){
           const position = child.config.functionality.positionVsParent;
-          const distance = child.config.functionality.distanceVsParent || 0;
           const measurementType = child.config.asset.type;
-          const key = `${measurementType}_${position}`;
           //rebuild to measurementype.variant no position and then switch based on values not strings or names.
           const eventName = `${measurementType}.measured.${position}`;
 
@@ -70,7 +68,7 @@ class pumpingStation {
            this.logger.debug(`Listening for flow changes from machine ${child.config.general.id}`);
 
             switch(child.config.functionality.positionVsParent){
-            case("downstream"):
+            case(POSITIONS.DOWNSTREAM):
             case("atequipment"): //in case of atequipment we also assume downstream seeing as it is registered at this pumpingstation as part of it.
               //for now lets focus on handling downstream predicted flow
               child.measurements.emitter.on("flow.predicted.downstream", (eventData) => {
@@ -80,7 +78,7 @@ class pumpingStation {
               break;
 
 
-            case("upstream"):
+            case(POSITIONS.UPSTREAM):
               //check for predicted outgoing flow at the connected child pumpingsation
               child.measurements.emitter.on("flow.predicted.downstream", (eventData) => {
                 this.logger.debug(`Flow prediction update from ${child.config.general.id}: ${eventData.value} ${eventData.unit}`);
@@ -97,7 +95,7 @@ class pumpingStation {
 
       // add one for group later
       if( softwareType == "machineGroup" ){
-
+        /* intentionally empty */
       }
 
       // add one for pumping station
@@ -109,7 +107,7 @@ class pumpingStation {
            this.logger.debug(`Listening for flow changes from machine ${child.config.general.id}`);
 
           switch(child.config.functionality.positionVsParent){
-            case("downstream"):
+            case(POSITIONS.DOWNSTREAM):
               //check for predicted outgoing flow at the connected child pumpingsation
               child.measurements.emitter.on("flow.predicted.downstream", (eventData) => {
                 this.logger.debug(`Flow prediction update from ${child.config.general.id}: ${eventData.value} ${eventData.unit}`);
@@ -118,7 +116,7 @@ class pumpingStation {
               });
               break;
 
-            case("upstream"):
+            case(POSITIONS.UPSTREAM):
               //check for predicted outgoing flow at the connected child pumpingsation
               child.measurements.emitter.on("flow.predicted.downstream", (eventData) => {
                 this.logger.debug(`Flow prediction update from ${child.config.general.id}: ${eventData.value} ${eventData.unit}`);
@@ -139,7 +137,7 @@ class pumpingStation {
 
     //get downflow
     const seriesExists = this.measurements.type("flow").variant("predicted").position(flowDir).exists();
-    if(!seriesExists){return};
+    if(!seriesExists){return}
 
     const series = this.measurements.type("flow").variant("predicted").position(flowDir);
     const currFLow = series.getLaggedValue(0, "m3/s"); // { value, timestamp, unit }
@@ -162,7 +160,7 @@ class pumpingStation {
     const calcVol = avgFlow * deltaSeconds;
 
     //substract seeing as this is downstream and is being pulled away from the pumpingstaion and keep track of status
-    const currVolume = this.measurements.type('volume').variant('predicted').position('atEquipment').getCurrentValue('m3');
+    const currVolume = this.measurements.type('volume').variant('predicted').position(POSITIONS.AT_EQUIPMENT).getCurrentValue('m3');
     let newVol = currVolume;
 
     switch(flowDir){
@@ -179,11 +177,11 @@ class pumpingStation {
       }
     
 
-    this.measurements.type('volume').variant('predicted').position('atEquipment').value(newVol).unit('m3');
+    this.measurements.type('volume').variant('predicted').position(POSITIONS.AT_EQUIPMENT).value(newVol).unit('m3');
     //convert to a predicted level
     const newLevel = this._calcLevelFromVolume(newVol);
 
-    this.measurements.type('level').variant('predicted').position('atEquipment').value(newLevel).unit('m');
+    this.measurements.type('level').variant('predicted').position(POSITIONS.AT_EQUIPMENT).value(newLevel).unit('m');
 
     this.logger.debug(`new predicted volume : ${newVol} new predicted level: ${newLevel} `);
 
@@ -213,7 +211,7 @@ class pumpingStation {
     this._updateVolumePrediction("in"); // check for changes in incomming flow
         //calc the most important values back to determine state and net up or downstream flow
     this._calcNetFlow();
-    this._calcTimeRemaining();
+    this._calcRemainingTime();
     
   }
   
@@ -257,13 +255,13 @@ class pumpingStation {
     this.measurements.type("pressure").variant("measured").position(position).value(value, context.timestamp, context.unit);
 
     //convert pressure to level based on density of water and height of pressure sensor
-    const mTemp = this.measurements.type("temperature").variant("measured").position("atEquipment").getCurrentValue('K'); //default to 20C if no temperature measurement
+    const mTemp = this.measurements.type("temperature").variant("measured").position(POSITIONS.AT_EQUIPMENT).getCurrentValue('K'); //default to 20C if no temperature measurement
 
     //prefer measured temp but otherwise assume nominal temp for wastewater
     if(mTemp === null){
       this.logger.warn(`No temperature measurement available, defaulting to 15C for pressure to level conversion.`);
-      this.measurements.type("temperature").variant("assumed").position("atEquipment").value(15, Date.now(), "C");
+      this.measurements.type("temperature").variant("assumed").position(POSITIONS.AT_EQUIPMENT).value(15, Date.now(), "C");
-      kelvinTemp = this.measurements.type('temperature').variant('assumed').position('atEquipment').getCurrentValue('K');
+      kelvinTemp = this.measurements.type('temperature').variant('assumed').position(POSITIONS.AT_EQUIPMENT).getCurrentValue('K');
       this.logger.debug(`Temperature is : ${kelvinTemp}`);
     } else {
       kelvinTemp = mTemp;
@@ -294,15 +292,14 @@ class pumpingStation {
 
     const proc = this.interpolate.interpolate_lin_single_point(volume,this.basin.minVol,this.basin.maxVolOverflow,0,100);
     this.logger.debug(`PROC volume : ${proc}`);
-    this.measurements.type("volume").variant("measured").position("atEquipment").value(volume).unit('m3');
+    this.measurements.type("volume").variant("measured").position(POSITIONS.AT_EQUIPMENT).value(volume).unit('m3');
-    this.measurements.type("volume").variant("procent").position("atEquipment").value(proc);
+    this.measurements.type("volume").variant("procent").position(POSITIONS.AT_EQUIPMENT).value(proc);
     
   }
 
   _calcNetFlow() {
-    let netFlow = null;
 
-    const netFlow_FlowSensor = Math.abs(this.measurements.type("flow").variant("measured").difference({ from: "downstream", to: "upstream", unit: "m3/s" }));
+    const netFlow_FlowSensor = Math.abs(this.measurements.type("flow").variant("measured").difference({ from: POSITIONS.DOWNSTREAM, to: POSITIONS.UPSTREAM, unit: "m3/s" }));
     const netFlow_LevelSensor = this._calcNetFlowFromLevelDiff();
     const netFlow_PredictedFlow = Math.abs(this.measurements.type('flow').variant('predicted').difference({ from: "in", to: "out", unit: "m3/s" }));
 
@@ -325,8 +322,9 @@ class pumpingStation {
   _calcRemainingTime(level,variant){
 
     const { heightOverflow, heightOutlet, surfaceArea } = this.basin;
-    const flowDiff = this.measurements.type("flow").variant(variant).difference({ from: "downstream", to: "upstream", unit: "m3/s" });
+    const flowDiff = this.measurements.type("flow").variant(variant).difference({ from: POSITIONS.DOWNSTREAM, to: POSITIONS.UPSTREAM, unit: "m3/s" });
 
+    let remainingHeight;
     switch(true){
       case(flowDiff>0):
         remainingHeight = Math.max(heightOverflow - level, 0);
@@ -348,6 +346,7 @@ class pumpingStation {
   _calcDirection(flowDiff){
 
     let direction = null;
+    const flowThreshold = 0.001;
 
      switch (true){
       case flowDiff > flowThreshold:
@@ -372,7 +371,7 @@ class pumpingStation {
 
   _calcNetFlowFromLevelDiff() {
     const { surfaceArea } = this.basin;
-    const levelObj = this.measurements.type("level").variant("measured").position("atEquipment");
+    const levelObj = this.measurements.type("level").variant("measured").position(POSITIONS.AT_EQUIPMENT);
     const level = levelObj.getCurrentValue("m");
     const prevLevel = levelObj.getLaggedValue(2, "m"); // { value, timestamp, unit }
     const measurement = levelObj.get();
@@ -424,7 +423,7 @@ class pumpingStation {
     this.basin.minVolOut      = minVolOut     ;
 
     //init predicted min volume to min vol in order to have a starting point
-    this.measurements.type("volume").variant("predicted").position("atEquipment").value(minVol).unit('m3');
+    this.measurements.type("volume").variant("predicted").position(POSITIONS.AT_EQUIPMENT).value(minVol).unit('m3');
 
     this.logger.debug(`
         Basin initialized | area=${surfaceArea.toFixed(2)} m², 
@@ -522,7 +521,7 @@ function createLevelMeasurementConfig(name) {
     functionality: {
       softwareType: "measurement",
       role: "sensor",
-      positionVsParent: "atEquipment"
+      positionVsParent: POSITIONS.AT_EQUIPMENT
     },
     asset: {
       category: "sensor",
@@ -564,7 +563,6 @@ function createFlowMeasurementConfig(name, position) {
 
 function createMachineConfig(name) {
 
-  curve = require('C:/Users/zn375/.node-red/public/fallbackData.json');
   return {
     
     general: {
@@ -605,7 +603,7 @@ function createMachineStateConfig() {
 }
 
 // convenience for seeding measurements
-function pushSample(measurement, type, value, unit) {
+function pushSample(measurement, type, value, unit) { // eslint-disable-line no-unused-vars
   const pos = measurement.config.functionality.positionVsParent;
   measurement.measurements
     .type(type)
@@ -615,13 +613,14 @@ function pushSample(measurement, type, value, unit) {
 }
 
 /** Demo *********************************************************************/
-(async function demoStationWithPump() {
+// Only run the demo when this file is executed directly (not when required as a module)
+if (require.main === module) (async function demoStationWithPump() {
   const station = new PumpingStation(createPumpingStationConfig("PumpingStationDemo"));
   const pump = new RotatingMachine(createMachineConfig("Pump1"), createMachineStateConfig());
 
-  const levelSensor = new Measurement(createLevelMeasurementConfig("WetWellLevel"));
+  const levelSensor = new Measurement(createLevelMeasurementConfig("WetWellLevel")); // eslint-disable-line no-unused-vars
-  const upstreamFlow = new Measurement(createFlowMeasurementConfig("InfluentFlow", "upstream"));
+  const upstreamFlow = new Measurement(createFlowMeasurementConfig("InfluentFlow", POSITIONS.UPSTREAM)); // eslint-disable-line no-unused-vars
-  const downstreamFlow = new Measurement(createFlowMeasurementConfig("PumpDischargeFlow", "downstream"));
+  const downstreamFlow = new Measurement(createFlowMeasurementConfig("PumpDischargeFlow", POSITIONS.DOWNSTREAM));
 
 
   // station uses the sensors
@@ -633,7 +632,7 @@ function pushSample(measurement, type, value, unit) {
 
   // pump owns the downstream flow sensor
   pump.childRegistrationUtils.registerChild(downstreamFlow, downstreamFlow.config.functionality.positionVsParent);
-  station.childRegistrationUtils.registerChild(pump,"downstream");
+  station.childRegistrationUtils.registerChild(pump, POSITIONS.DOWNSTREAM);
 
   setInterval(() => station.tick(), 1000);
 

test/specificClass.test.js

@@ -0,0 +1,260 @@
+/**
+ * Tests for pumpingStation specificClass (domain logic).
+ *
+ * The pumpingStation class manages a basin (wet well):
+ *  - initBasinProperties: derives surface area, volumes from config
+ *  - _calcVolumeFromLevel / _calcLevelFromVolume: linear geometry
+ *  - _calcDirection: filling / draining / stable from flow diff
+ *  - _callMeasurementHandler: dispatches to type-specific handlers
+ *  - getOutput: builds an output snapshot
+ */
+
+const PumpingStation = require('../src/specificClass');
+
+// --------------- helpers ---------------
+
+function makeConfig(overrides = {}) {
+  const base = {
+    general: {
+      name: 'TestStation',
+      id: 'ps-test-1',
+      unit: 'm3/h',
+      logging: { enabled: false, logLevel: 'error' },
+    },
+    functionality: {
+      softwareType: 'pumpingStation',
+      role: 'stationcontroller',
+      positionVsParent: 'atEquipment',
+    },
+    basin: {
+      volume: 50,       // m3  (empty basin volume)
+      height: 5,        // m
+      heightInlet: 0.3,  // m
+      heightOutlet: 0.2, // m
+      heightOverflow: 4.0, // m
+    },
+    hydraulics: {
+      refHeight: 'NAP',
+      basinBottomRef: 0,
+    },
+  };
+
+  for (const key of Object.keys(overrides)) {
+    if (typeof overrides[key] === 'object' && !Array.isArray(overrides[key]) && base[key]) {
+      base[key] = { ...base[key], ...overrides[key] };
+    } else {
+      base[key] = overrides[key];
+    }
+  }
+  return base;
+}
+
+// --------------- tests ---------------
+
+describe('pumpingStation specificClass', () => {
+
+  describe('constructor / initialization', () => {
+    it('should create an instance with the given config', () => {
+      const ps = new PumpingStation(makeConfig());
+      expect(ps).toBeDefined();
+      expect(ps.config.general.name).toBe('teststation');
+    });
+
+    it('should initialize state object with default values', () => {
+      const ps = new PumpingStation(makeConfig());
+      expect(ps.state).toEqual({ direction: '', netDownstream: 0, netUpstream: 0, seconds: 0 });
+    });
+
+    it('should initialize empty machines, stations, child, parent objects', () => {
+      const ps = new PumpingStation(makeConfig());
+      expect(ps.machines).toEqual({});
+      expect(ps.stations).toEqual({});
+      expect(ps.child).toEqual({});
+      expect(ps.parent).toEqual({});
+    });
+  });
+
+  describe('initBasinProperties()', () => {
+    it('should calculate surfaceArea = volume / height', () => {
+      const ps = new PumpingStation(makeConfig());
+      // 50 / 5 = 10 m2
+      expect(ps.basin.surfaceArea).toBe(10);
+    });
+
+    it('should calculate maxVol = height * surfaceArea', () => {
+      const ps = new PumpingStation(makeConfig());
+      // 5 * 10 = 50
+      expect(ps.basin.maxVol).toBe(50);
+    });
+
+    it('should calculate maxVolOverflow = heightOverflow * surfaceArea', () => {
+      const ps = new PumpingStation(makeConfig());
+      // 4.0 * 10 = 40
+      expect(ps.basin.maxVolOverflow).toBe(40);
+    });
+
+    it('should calculate minVol = heightOutlet * surfaceArea', () => {
+      const ps = new PumpingStation(makeConfig());
+      // 0.2 * 10 = 2
+      expect(ps.basin.minVol).toBeCloseTo(2, 5);
+    });
+
+    it('should calculate minVolOut = heightInlet * surfaceArea', () => {
+      const ps = new PumpingStation(makeConfig());
+      // 0.3 * 10 = 3
+      expect(ps.basin.minVolOut).toBeCloseTo(3, 5);
+    });
+
+    it('should store the raw config values on basin', () => {
+      const ps = new PumpingStation(makeConfig());
+      expect(ps.basin.volEmptyBasin).toBe(50);
+      expect(ps.basin.heightBasin).toBe(5);
+      expect(ps.basin.heightInlet).toBe(0.3);
+      expect(ps.basin.heightOutlet).toBe(0.2);
+      expect(ps.basin.heightOverflow).toBe(4.0);
+    });
+  });
+
+  describe('_calcVolumeFromLevel()', () => {
+    let ps;
+    beforeAll(() => { ps = new PumpingStation(makeConfig()); });
+
+    it('should return level * surfaceArea', () => {
+      // surfaceArea = 10, level = 2 => 20
+      expect(ps._calcVolumeFromLevel(2)).toBe(20);
+    });
+
+    it('should return 0 for level = 0', () => {
+      expect(ps._calcVolumeFromLevel(0)).toBe(0);
+    });
+
+    it('should clamp negative levels to 0', () => {
+      expect(ps._calcVolumeFromLevel(-3)).toBe(0);
+    });
+  });
+
+  describe('_calcLevelFromVolume()', () => {
+    let ps;
+    beforeAll(() => { ps = new PumpingStation(makeConfig()); });
+
+    it('should return volume / surfaceArea', () => {
+      // surfaceArea = 10, vol = 20 => 2
+      expect(ps._calcLevelFromVolume(20)).toBe(2);
+    });
+
+    it('should return 0 for volume = 0', () => {
+      expect(ps._calcLevelFromVolume(0)).toBe(0);
+    });
+
+    it('should clamp negative volumes to 0', () => {
+      expect(ps._calcLevelFromVolume(-10)).toBe(0);
+    });
+  });
+
+  describe('volume/level roundtrip', () => {
+    it('should roundtrip level -> volume -> level', () => {
+      const ps = new PumpingStation(makeConfig());
+      const level = 2.7;
+      const vol = ps._calcVolumeFromLevel(level);
+      const levelBack = ps._calcLevelFromVolume(vol);
+      expect(levelBack).toBeCloseTo(level, 10);
+    });
+  });
+
+  describe('_calcDirection()', () => {
+    let ps;
+    beforeAll(() => { ps = new PumpingStation(makeConfig()); });
+
+    it('should return "filling" for positive flow above threshold', () => {
+      expect(ps._calcDirection(0.01)).toBe('filling');
+    });
+
+    it('should return "draining" for negative flow below negative threshold', () => {
+      expect(ps._calcDirection(-0.01)).toBe('draining');
+    });
+
+    it('should return "stable" for flow near zero (within threshold)', () => {
+      expect(ps._calcDirection(0.0005)).toBe('stable');
+      expect(ps._calcDirection(-0.0005)).toBe('stable');
+      expect(ps._calcDirection(0)).toBe('stable');
+    });
+  });
+
+  describe('_callMeasurementHandler()', () => {
+    it('should not throw for flow and temperature measurement types', () => {
+      const ps = new PumpingStation(makeConfig());
+      // flow and temperature handlers are empty stubs, safe to call
+      expect(() => ps._callMeasurementHandler('flow', 0.5, 'downstream', {})).not.toThrow();
+      expect(() => ps._callMeasurementHandler('temperature', 15, 'atEquipment', {})).not.toThrow();
+    });
+
+    it('should dispatch to the correct handler based on measurement type', () => {
+      const ps = new PumpingStation(makeConfig());
+      // Verify the switch dispatches by checking it does not warn for known types
+      // pressure handler stores values and attempts coolprop calculation
+      // level handler stores values and computes volume
+      // We verify the dispatch logic by calling with type and checking no unhandled error
+      const spy = jest.spyOn(ps, 'updateMeasuredFlow');
+      ps._callMeasurementHandler('flow', 0.5, 'downstream', {});
+      expect(spy).toHaveBeenCalledWith(0.5, 'downstream', {});
+      spy.mockRestore();
+    });
+  });
+
+  describe('getOutput()', () => {
+    it('should return an object containing state and basin', () => {
+      const ps = new PumpingStation(makeConfig());
+      const out = ps.getOutput();
+      expect(out).toHaveProperty('state');
+      expect(out).toHaveProperty('basin');
+      expect(out.state).toBe(ps.state);
+      expect(out.basin).toBe(ps.basin);
+    });
+
+    it('should include measurement keys in the output', () => {
+      const ps = new PumpingStation(makeConfig());
+      const out = ps.getOutput();
+      // After initialization the predicted volume is set
+      expect(typeof out).toBe('object');
+    });
+  });
+
+  describe('_calcRemainingTime()', () => {
+    it('should not throw when called with a level and variant', () => {
+      const ps = new PumpingStation(makeConfig());
+      // Should not throw even with no measurement data; it will just find null diffs
+      expect(() => ps._calcRemainingTime(2, 'predicted')).not.toThrow();
+    });
+  });
+
+  describe('tick()', () => {
+    it('should call _updateVolumePrediction and _calcNetFlow', () => {
+      const ps = new PumpingStation(makeConfig());
+      const spyVol = jest.spyOn(ps, '_updateVolumePrediction');
+      const spyNet = jest.spyOn(ps, '_calcNetFlow');
+      // stub _calcRemainingTime to avoid needing full measurement data
+      ps._calcRemainingTime = jest.fn();
+      ps.tick();
+      expect(spyVol).toHaveBeenCalledWith('out');
+      expect(spyVol).toHaveBeenCalledWith('in');
+      expect(spyNet).toHaveBeenCalled();
+      spyVol.mockRestore();
+      spyNet.mockRestore();
+    });
+  });
+
+  describe('edge cases', () => {
+    it('should handle basin with zero height gracefully', () => {
+      // surfaceArea = volume / height => division by 0 gives Infinity
+      const config = makeConfig({ basin: { volume: 50, height: 0, heightInlet: 0, heightOutlet: 0, heightOverflow: 0 } });
+      const ps = new PumpingStation(config);
+      expect(ps.basin.surfaceArea).toBe(Infinity);
+    });
+
+    it('should handle basin with very small dimensions', () => {
+      const config = makeConfig({ basin: { volume: 0.001, height: 0.001, heightInlet: 0, heightOutlet: 0, heightOverflow: 0.0005 } });
+      const ps = new PumpingStation(config);
+      expect(ps.basin.surfaceArea).toBeCloseTo(1, 5);
+    });
+  });
+});