Add mockup files for the driver tests

UpdateService, the system's EthernetInterfaces and all chassis Sensors from public-rackmount1, unmodified.

tests/fixtures/dmtf-public-rackmount1/Chassis/1U/Sensors/Battery1OutputCurrent/index.json

@@ -0,0 +1,30 @@
+{
+    "@odata.type": "#Sensor.v1_14_0.Sensor",
+    "Id": "Battery1OutputCurrent",
+    "Name": "Battery #1 Output Current",
+    "Status": {
+        "State": "Enabled",
+        "Health": "OK"
+    },
+    "ReadingType": "Current",
+    "Reading": 0,
+    "ReadingUnits": "A",
+    "ReadingRangeMin": 0,
+    "ReadingRangeMax": 15,
+    "PhysicalContext": "Battery",
+    "PhysicalSubContext": "Output",
+    "Thresholds": {
+        "UpperCritical": {
+            "Reading": 10,
+            "Activation": "Increasing",
+            "DwellTime": "PT1S"
+        },
+        "UpperCaution": {
+            "Reading": 8,
+            "Activation": "Increasing",
+            "DwellTime": "PT1S"
+        }
+    },
+    "@odata.id": "/redfish/v1/Chassis/1U/Sensors/Battery1OutputCurrent",
+    "@Redfish.Copyright": "Copyright 2014-2026 DMTF. For the full DMTF copyright policy, see http://www.dmtf.org/about/policies/copyright."
+}