adding testcase for dual fuel in engineering mode

Generic Vehicles/Engineering Mode/Class5_Tractor_4x2/325kW_DF.vmap

+engine speed [rpm], torque [Nm], fuel consumption [g/h] 
+550,-135.5,0.00
+550,0,.15
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+550,426.8,58.3
+550,640.2,8316.2
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+750.9,1067,1605.52
+750.9,1280.4,1923.13
+750.9,1493.8,2240.01
+750.9,1544.879,2321.39
+751,1758.279,2639.29
+902,-147.59,0.00
+901.8,0,221.07
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+901.8,853.6,1541.05
+901.8,1067,190.8
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+901.8,1493.8,2654.38
+901.8,1707.2,3053.46
+901.8,1901.757,3435.27
+902,2115.157,3840.32
+1063,-155.445,0.00
+1062.7,0,276.80
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+1062.7,640.2,136.2
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+1062.7,1067,2207.27
+1062.7,1280.4,2616.11
+1062.7,1493.8,3052.55
+1062.7,1707.2,3501.91
+1062.7,1920.6,399.1
+1062.7,2134,4543.81
+1063,2347.4,5054.25
+1204,-165.44,0.00
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+1203.6,1067,251.7
+1203.6,1280.4,2978.22
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+1203.6,1920.6,452.5
+1203.6,2134,5112.90
+1204,2347.4,5673.28
+1367,-183.37,0.00
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+1489.6,2041.712,6060.95
+1490,2255.112,6731.18
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+1612,2128.834,6949.19
+1735,-235.225,0.00
+1734.7,0,558.69
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+1734.7,1707.2,5946.93
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+1735,2002.659,7093.52
+1857,-253.69,0.00
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+1857.3,1587.631,5943.41
+1857,1801.031,6721.53
+1957,-270.69,0.00
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+1957.3,640.2,2565.23
+1957.3,853.6,3300.30
+1957.3,1067,4043.80
+1957.3,1280.4,4811.75
+1957.3,1493.8,5584.85
+1957.3,1587.631,5943.41
+1957,1801.031,6721.53

Generic Vehicles/Engineering Mode/Class5_Tractor_4x2/Class5_Tractor_ENG_WHR_ESS_DF.vecto

+{
+  "Header": {
+    "CreatedBy": "",
+    "Date": "2019-08-07T15:08:52.7145424Z",
+    "AppVersion": "3",
+    "FileVersion": 5
+  },
+  "Body": {
+    "SavedInDeclMode": false,
+    "EngineOnlyMode": false,
+    "VehicleFile": "Class5_Tractor_ESS.vveh",
+    "EngineFile": "Engine_325kW_12.7l_WHR_DF.veng",
+    "GearboxFile": "AMT_12.vgbx",
+    "AuxiliaryAssembly": "Classic",
+    "AuxiliaryVersion": "CLASSIC",
+    "AdvancedAuxiliaryFilePath": "",
+    "Aux": [
+      {
+        "ID": "ES",
+        "Type": "Electric System",
+        "Path": "Alt.vaux",
+        "Technology": []
+      }
+    ],
+    "Padd": 5000.0,
+    "VACC": "Truck.vacc",
+    "EngineStopStartAtVehicleStopThreshold": 2.0,
+    "EngineStopStartMaxOffTimespan": 120.0,
+    "EngineStopStartUtilityFactor": 0.8,
+    "LAC": {
+      "Enabled": true,
+      "PreviewDistanceFactor": 10.0,
+      "DF_offset": 2.5,
+      "DF_scaling": 1.5,
+      "DF_targetSpeedLookup": "",
+      "Df_velocityDropLookup": "",
+      "MinSpeed": 50.0
+    },
+    "OverSpeedEcoRoll": {
+      "Mode": "Overspeed",
+      "MinSpeed": 50.0,
+      "OverSpeed": 5.0,
+      "UnderSpeed": 5.0
+    },
+    "Cycles": [
+      "Long_Haul+ES.vdri"
+    ]
+  }
+}
\ No newline at end of file

Generic Vehicles/Engineering Mode/Class5_Tractor_4x2/Engine_325kW_12.7l_WHR_DF.veng

+{
+  "Header": {
+    "CreatedBy": "",
+    "Date": "2019-08-07T15:06:44.7357177Z",
+    "AppVersion": "3",
+    "FileVersion": 5
+  },
+  "Body": {
+    "SavedInDeclMode": false,
+    "ModelName": "325kW 12.7l Engine",
+    "Displacement": "12740",
+    "IdlingSpeed": 600.0,
+    "Inertia": 5.1498,
+    "Fuels": [
+      {
+        "WHTC-Urban": 0.0,
+        "WHTC-Rural": 0.0,
+        "WHTC-Motorway": 0.0,
+        "WHTC-Engineering": 1.0,
+        "ColdHotBalancingFactor": 0.0,
+        "CFRegPer": 1.0,
+        "FuelMap": "325kW_WHR.vmap",
+        "FuelType": "EthanolPI"
+      },
+      {
+        "WHTC-Urban": 1.0,
+        "WHTC-Rural": 1.0,
+        "WHTC-Motorway": 1.0,
+        "WHTC-Engineering": 1.024,
+        "ColdHotBalancingFactor": 1.0,
+        "CFRegPer": 1.0,
+        "FuelMap": "325kW_DF.vmap",
+        "FuelType": "DieselCI"
+      }
+    ],
+    "RatedPower": 0.0,
+    "RatedSpeed": 0.0,
+    "MaxTorque": 0.0,
+    "FullLoadCurve": "325kW.vfld",
+    "WHRType": "ElectricalOnly",
+    "WHRCorrectionFactors": {
+      "Urban": 0.0,
+      "Rural": 0.0,
+      "Motorway": 0.0,
+      "ColdHotBalancingFactor": 0.0,
+      "CFRegPer": 0.0,
+      "EngineeringCorrectionFactor": 1.02
+    }
+  }
+}
\ No newline at end of file