diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/current-unavailable.xml b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/current-unavailable.xml
new file mode 100644
index 00000000..0d25f8df
--- /dev/null
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/current-unavailable.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<MTConnectStreams xmlns="urn:mtconnect.org:MTConnectStreams:1.3"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="urn:mtconnect.org:MTConnectStreams:1.3 http://www.mtconnect.org/schemas/MTConnectStreams_1.3.xsd">
+  <!-- Every observation UNAVAILABLE - Task 8's quality-mapping fixture. -->
+  <Header creationTime="2026-07-24T12:10:00.600Z"
+          sender="fixture-agent"
+          instanceId="1655000000"
+          version="1.3.0.12"
+          assetBufferSize="1024"
+          assetCount="0"
+          bufferSize="131072"
+          firstSequence="200"
+          lastSequence="206"
+          nextSequence="207"/>
+  <Streams>
+    <DeviceStream name="VMC-3Axis" uuid="dev1-uuid">
+      <ComponentStream component="Device" componentId="dev1" name="dev1">
+        <Events>
+          <Availability dataItemId="dev1_avail" timestamp="2026-07-24T12:10:00.000Z" sequence="200">UNAVAILABLE</Availability>
+        </Events>
+      </ComponentStream>
+      <ComponentStream component="Path" componentId="dev1_path" name="path">
+        <Samples>
+          <Position dataItemId="dev1_pos" timestamp="2026-07-24T12:10:00.100Z" sequence="201" subType="ACTUAL">UNAVAILABLE</Position>
+          <PathFeedrate dataItemId="dev1_vibration_ts" timestamp="2026-07-24T12:10:00.200Z" sequence="202"
+                        sampleCount="10" sampleRate="100">UNAVAILABLE</PathFeedrate>
+        </Samples>
+        <Events>
+          <PartCount dataItemId="dev1_partcount" timestamp="2026-07-24T12:10:00.300Z" sequence="203">UNAVAILABLE</PartCount>
+          <Execution dataItemId="dev1_execution" timestamp="2026-07-24T12:10:00.400Z" sequence="204">UNAVAILABLE</Execution>
+          <Program dataItemId="dev1_program" timestamp="2026-07-24T12:10:00.500Z" sequence="205">UNAVAILABLE</Program>
+        </Events>
+        <Condition>
+          <Unavailable dataItemId="dev1_system_cond" timestamp="2026-07-24T12:10:00.600Z" sequence="206" type="SYSTEM"/>
+        </Condition>
+      </ComponentStream>
+    </DeviceStream>
+  </Streams>
+</MTConnectStreams>
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/current.xml b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/current.xml
new file mode 100644
index 00000000..7b095386
--- /dev/null
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/current.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<MTConnectStreams xmlns="urn:mtconnect.org:MTConnectStreams:1.3"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="urn:mtconnect.org:MTConnectStreams:1.3 http://www.mtconnect.org/schemas/MTConnectStreams_1.3.xsd">
+  <Header creationTime="2026-07-24T12:00:00.700Z"
+          sender="fixture-agent"
+          instanceId="1655000000"
+          version="1.3.0.12"
+          assetBufferSize="1024"
+          assetCount="0"
+          bufferSize="131072"
+          firstSequence="1"
+          lastSequence="107"
+          nextSequence="108"/>
+  <Streams>
+    <DeviceStream name="VMC-3Axis" uuid="dev1-uuid">
+      <ComponentStream component="Device" componentId="dev1" name="dev1">
+        <Events>
+          <Availability dataItemId="dev1_avail" timestamp="2026-07-24T12:00:00.100Z" sequence="101">AVAILABLE</Availability>
+        </Events>
+      </ComponentStream>
+      <ComponentStream component="Path" componentId="dev1_path" name="path">
+        <Samples>
+          <!-- Good/present value used by Task 10's snapshot-read test -->
+          <Position dataItemId="dev1_pos" timestamp="2026-07-24T12:00:00.200Z" sequence="102" subType="ACTUAL">123.4567</Position>
+          <PathFeedrate dataItemId="dev1_vibration_ts" timestamp="2026-07-24T12:00:00.300Z" sequence="103"
+                        sampleCount="10" sampleRate="100">1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0</PathFeedrate>
+        </Samples>
+        <Events>
+          <!-- UNAVAILABLE value used by Task 8's quality-mapping (BadNoCommunication) test -->
+          <PartCount dataItemId="dev1_partcount" timestamp="2026-07-24T12:00:00.400Z" sequence="104">UNAVAILABLE</PartCount>
+          <Execution dataItemId="dev1_execution" timestamp="2026-07-24T12:00:00.500Z" sequence="105">ACTIVE</Execution>
+          <Program dataItemId="dev1_program" timestamp="2026-07-24T12:00:00.600Z" sequence="106">O1234</Program>
+        </Events>
+        <Condition>
+          <Normal dataItemId="dev1_system_cond" timestamp="2026-07-24T12:00:00.700Z" sequence="107" type="SYSTEM"/>
+        </Condition>
+      </ComponentStream>
+    </DeviceStream>
+  </Streams>
+</MTConnectStreams>
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/probe.xml b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/probe.xml
new file mode 100644
index 00000000..dcf97716
--- /dev/null
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/probe.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<MTConnectDevices xmlns="urn:mtconnect.org:MTConnectDevices:1.3"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="urn:mtconnect.org:MTConnectDevices:1.3 http://www.mtconnect.org/schemas/MTConnectDevices_1.3.xsd">
+  <Header creationTime="2026-07-24T12:00:00Z"
+          sender="fixture-agent"
+          instanceId="1655000000"
+          version="1.3.0.12"
+          assetBufferSize="1024"
+          assetCount="0"
+          bufferSize="131072"/>
+  <Devices>
+    <Device id="dev1" name="VMC-3Axis" uuid="dev1-uuid">
+      <Description manufacturer="Fixture Corp">Test fixture device for MTConnect driver unit tests</Description>
+      <DataItems>
+        <!-- EVENT, controlled-vocabulary, directly on the Device (no nested Component) -->
+        <DataItem id="dev1_avail" category="EVENT" type="AVAILABILITY"/>
+      </DataItems>
+      <Components>
+        <Controller id="dev1_controller" name="controller">
+          <Components>
+            <Path id="dev1_path" name="path">
+              <DataItems>
+                <!-- SAMPLE with units -->
+                <DataItem id="dev1_pos" category="SAMPLE" type="POSITION" subType="ACTUAL"
+                          units="MILLIMETER" nativeUnits="MILLIMETER"/>
+                <!-- SAMPLE, representation=TIME_SERIES with sampleCount -->
+                <DataItem id="dev1_vibration_ts" category="SAMPLE" type="PATH_FEEDRATE"
+                          representation="TIME_SERIES" units="MILLIMETER/SECOND"
+                          nativeUnits="MILLIMETER/SECOND" sampleCount="10" sampleRate="100"/>
+                <!-- EVENT, numeric type -->
+                <DataItem id="dev1_partcount" category="EVENT" type="PART_COUNT"/>
+                <!-- EVENT, controlled vocabulary -->
+                <DataItem id="dev1_execution" category="EVENT" type="EXECUTION"/>
+                <!-- EVENT, free text -->
+                <DataItem id="dev1_program" category="EVENT" type="PROGRAM"/>
+                <!-- CONDITION -->
+                <DataItem id="dev1_system_cond" category="CONDITION" type="SYSTEM"/>
+              </DataItems>
+            </Path>
+          </Components>
+        </Controller>
+      </Components>
+    </Device>
+  </Devices>
+</MTConnectDevices>
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/sample-gap.xml b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/sample-gap.xml
new file mode 100644
index 00000000..bc167cc7
--- /dev/null
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/sample-gap.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<MTConnectStreams xmlns="urn:mtconnect.org:MTConnectStreams:1.3"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="urn:mtconnect.org:MTConnectStreams:1.3 http://www.mtconnect.org/schemas/MTConnectStreams_1.3.xsd">
+  <!--
+    Ring-buffer-overflow / forced-nextSequence-gap fixture.
+    firstSequence (5000) is strictly greater than any requestedFrom the driver would plausibly
+    have used to continue from current.xml/sample.xml (last nextSequence was 113), and is also
+    comfortably greater than the requestedFrom=1 asserted by Task 7's IsSequenceGap(1, chunk)==true
+    test. instanceId is identical to current.xml/sample.xml so the gap - not an agent restart -
+    is what's under test.
+  -->
+  <Header creationTime="2026-07-24T12:05:00.000Z"
+          sender="fixture-agent"
+          instanceId="1655000000"
+          version="1.3.0.12"
+          assetBufferSize="1024"
+          assetCount="0"
+          bufferSize="131072"
+          firstSequence="5000"
+          lastSequence="5004"
+          nextSequence="5005"/>
+  <Streams>
+    <DeviceStream name="VMC-3Axis" uuid="dev1-uuid">
+      <ComponentStream component="Path" componentId="dev1_path" name="path">
+        <Samples>
+          <Position dataItemId="dev1_pos" timestamp="2026-07-24T12:05:00.100Z" sequence="5000" subType="ACTUAL">200.0000</Position>
+          <PathFeedrate dataItemId="dev1_vibration_ts" timestamp="2026-07-24T12:05:00.200Z" sequence="5001"
+                        sampleCount="10" sampleRate="100">3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0</PathFeedrate>
+        </Samples>
+        <Events>
+          <PartCount dataItemId="dev1_partcount" timestamp="2026-07-24T12:05:00.300Z" sequence="5002">99</PartCount>
+          <Execution dataItemId="dev1_execution" timestamp="2026-07-24T12:05:00.400Z" sequence="5003">ACTIVE</Execution>
+          <Program dataItemId="dev1_program" timestamp="2026-07-24T12:05:00.500Z" sequence="5004">O5678</Program>
+        </Events>
+      </ComponentStream>
+    </DeviceStream>
+  </Streams>
+</MTConnectStreams>
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/sample.xml b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/sample.xml
new file mode 100644
index 00000000..395687b6
--- /dev/null
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.MTConnect.Tests/Fixtures/sample.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<MTConnectStreams xmlns="urn:mtconnect.org:MTConnectStreams:1.3"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="urn:mtconnect.org:MTConnectStreams:1.3 http://www.mtconnect.org/schemas/MTConnectStreams_1.3.xsd">
+  <!-- Continues contiguously from current.xml: firstSequence (108) == the nextSequence current.xml advertised. -->
+  <Header creationTime="2026-07-24T12:00:01.200Z"
+          sender="fixture-agent"
+          instanceId="1655000000"
+          version="1.3.0.12"
+          assetBufferSize="1024"
+          assetCount="0"
+          bufferSize="131072"
+          firstSequence="108"
+          lastSequence="112"
+          nextSequence="113"/>
+  <Streams>
+    <DeviceStream name="VMC-3Axis" uuid="dev1-uuid">
+      <ComponentStream component="Path" componentId="dev1_path" name="path">
+        <Samples>
+          <Position dataItemId="dev1_pos" timestamp="2026-07-24T12:00:00.800Z" sequence="108" subType="ACTUAL">124.0100</Position>
+          <PathFeedrate dataItemId="dev1_vibration_ts" timestamp="2026-07-24T12:00:00.900Z" sequence="109"
+                        sampleCount="10" sampleRate="100">2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0</PathFeedrate>
+        </Samples>
+        <Events>
+          <PartCount dataItemId="dev1_partcount" timestamp="2026-07-24T12:00:01.000Z" sequence="110">42</PartCount>
+          <Execution dataItemId="dev1_execution" timestamp="2026-07-24T12:00:01.100Z" sequence="111">ACTIVE</Execution>
+          <Program dataItemId="dev1_program" timestamp="2026-07-24T12:00:01.200Z" sequence="112">O1234</Program>
+        </Events>
+      </ComponentStream>
+    </DeviceStream>
+  </Streams>
+</MTConnectStreams>