diff --git a/unit-test-coverage/modules/CMakeLists.txt b/unit-test-coverage/modules/CMakeLists.txt
index 5e712874..9e6eb640 100644
--- a/unit-test-coverage/modules/CMakeLists.txt
+++ b/unit-test-coverage/modules/CMakeLists.txt
@@ -66,3 +66,4 @@ endfunction(add_psp_covtest)
 
 # a list of modules for which there is a coverage test implemented
 add_subdirectory(timebase_vxworks)
+add_subdirectory(vxworks_sysmon)
diff --git a/unit-test-coverage/modules/vxworks_sysmon/CMakeLists.txt b/unit-test-coverage/modules/vxworks_sysmon/CMakeLists.txt
new file mode 100644
index 00000000..1b9652f3
--- /dev/null
+++ b/unit-test-coverage/modules/vxworks_sysmon/CMakeLists.txt
@@ -0,0 +1,11 @@
+######################################################################
+#
+# CMAKE build recipe for white-box coverage tests of VxWorks timebase module
+#
+add_definitions(-D_CFE_PSP_MODULE_)
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}/inc")
+include_directories("${CFEPSP_SOURCE_DIR}/fsw/modules/iodriver/inc")
+
+add_psp_covtest(vxworks_sysmon src/coveragetest-vxworks_sysmon.c
+    ${CFEPSP_SOURCE_DIR}/fsw/modules/vxworks_sysmon/vxworks_sysmon.c
+)
diff --git a/unit-test-coverage/modules/vxworks_sysmon/inc/coveragetest-vxworks_sysmon.h b/unit-test-coverage/modules/vxworks_sysmon/inc/coveragetest-vxworks_sysmon.h
new file mode 100644
index 00000000..d68abc11
--- /dev/null
+++ b/unit-test-coverage/modules/vxworks_sysmon/inc/coveragetest-vxworks_sysmon.h
@@ -0,0 +1,56 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: 
+ * Draco
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **********************************************************************/
+
+/*
+ *
+ *    Copyright (c) 2023, United States government as represented by the
+ *    administrator of the National Aeronautics Space Administration.
+ *    All rights reserved. This software was created at NASA Goddard
+ *    Space Flight Center pursuant to government contracts.
+ *
+ *    This is governed by the NASA Open Source Agreement and may be used,
+ *    distributed and modified only according to the terms of that agreement.
+ *
+ */
+
+/**
+ * \file
+ * \ingroup  vxworks
+ * \author   anh.d.van@nasa.gov
+ *
+ */
+
+#ifndef COVERAGETEST_VXWORKS_SYSMON_H
+#define COVERAGETEST_VXWORKS_SYSMON_H
+
+#include "utassert.h"
+#include "uttest.h"
+#include "utstubs.h"
+
+#include "iodriver_analog_io.h"
+#include "iodriver_base.h"
+#include "iodriver_impl.h"
+
+void Test_Entry_Nominal(void);
+void Test_Aggregate_Nominal(void);
+void Test_Aggregate_Error(void);
+void Test_Dispatch_Nominal(void);
+void Test_Dispatch_Error(void);
+
+#endif
diff --git a/unit-test-coverage/modules/vxworks_sysmon/src/coveragetest-vxworks_sysmon.c b/unit-test-coverage/modules/vxworks_sysmon/src/coveragetest-vxworks_sysmon.c
new file mode 100644
index 00000000..4816b4f2
--- /dev/null
+++ b/unit-test-coverage/modules/vxworks_sysmon/src/coveragetest-vxworks_sysmon.c
@@ -0,0 +1,266 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: 
+ * Draco
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **********************************************************************/
+
+/*
+ *
+ *    Copyright (c) 2023, United States government as represented by the
+ *    administrator of the National Aeronautics Space Administration.
+ *    All rights reserved. This software was created at NASA Goddard
+ *    Space Flight Center pursuant to government contracts.
+ *
+ *    This is governed by the NASA Open Source Agreement and may be used,
+ *    distributed and modified only according to the terms of that agreement.
+ *
+ */
+
+/**
+ * \file
+ * \ingroup  modules
+ *
+ * Coverage test for VxWorks Sysmon
+ */
+
+#include "utassert.h"
+#include "utstubs.h"
+#include "uttest.h"
+
+#include "cfe_psp.h"
+#include "cfe_psp_config.h"
+#include "cfe_psp_module.h"
+
+#include "PCS_spyLib.h"
+#include "PCS_spyLibP.h"
+
+#include "coveragetest-vxworks_sysmon.h"
+
+/*
+ * Reference to the API entry point for the module
+ */
+extern CFE_PSP_ModuleApi_t CFE_PSP_vxworks_sysmon_API;
+const CFE_PSP_ModuleApi_t *TgtAPI = &CFE_PSP_vxworks_sysmon_API;
+
+void ModuleTest_ResetState(void)
+{
+    TgtAPI->Init(0); /* Init Vxworks Sysmon */
+}
+
+void Test_Entry_Nominal(void)
+{
+    int32 StatusCode;
+    CFE_PSP_IODriver_API_t *EntryAPI = TgtAPI->ExtendedApi;
+
+    /* Nominal Case: Aggregate Subsystem */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_NOOP, 0, 0, CFE_PSP_IODriver_U32ARG(0)); 
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Nominal Case: Aggregate Subsystem");
+
+    /* Nominal Case: Cpuload Subsystem */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_NOOP, 1, 0, CFE_PSP_IODriver_U32ARG(0)); 
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: Cpuload Subsystem");
+
+    /* Nominal Case: No Subsystem */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_NOOP, 2, 0, CFE_PSP_IODriver_U32ARG(0)); 
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Nominal Case: No Subsystem");
+}
+
+void Test_Aggregate_Nominal(void)
+{
+    int32 StatusCode;
+    int32 IsRunningStatus;;
+    CFE_PSP_IODriver_AdcCode_t     Sample;
+    CFE_PSP_IODriver_AnalogRdWr_t  RdWr = {.NumChannels = 1, .Samples = &Sample};;    
+    CFE_PSP_IODriver_Direction_t QueryDirArg;
+    CFE_PSP_IODriver_API_t *EntryAPI = TgtAPI->ExtendedApi;
+
+    /* Nominal Case: Aggregate Dispatch Noop CMD (Not Impl) */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_NOOP, 0, 0, CFE_PSP_IODriver_U32ARG(0)); /* Entry Point */
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Nominal Case: IO Driver NOOP");
+
+    /* Nominal Case: Aggregate Dispatch Noop CMD (Not Impl) */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_NOOP, 0, 0, CFE_PSP_IODriver_U32ARG(0));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Nominal Case:  ANALOG IO NOOP");
+
+    /* Nominal Case: Start Vxworks Sysmon */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_SET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    IsRunningStatus = EntryAPI->DeviceCommand(CFE_PSP_IODriver_GET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: Start Vxworks Sysmon");
+    UtAssert_True(IsRunningStatus == true, "Nominal Case: Vxworks Sysmon running status set");
+
+    /* Nominal Case: VxWorks Sysmon already running */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_SET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    IsRunningStatus = EntryAPI->DeviceCommand(CFE_PSP_IODriver_GET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: Vxworks Sysmon Already Running");
+    UtAssert_True(IsRunningStatus == true, "Nominal Case: Vxworks Sysmon running status already set");
+
+    /* Nominal Case: Stop Vxworks Sysmon */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_SET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(0));
+    IsRunningStatus = EntryAPI->DeviceCommand(CFE_PSP_IODriver_GET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: Stop Vxworks Sysmon");
+    UtAssert_True(IsRunningStatus == false, "Nominal Case: Vxworks Sysmon running status disabled");   
+
+    /* Nominal Case: Vxworks Sysmon already stop */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_SET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(0));
+    IsRunningStatus = EntryAPI->DeviceCommand(CFE_PSP_IODriver_GET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: Vxworks Sysmon already stopped");
+    UtAssert_True(IsRunningStatus == false, "Nominal Case: Vxworks Sysmon running status already disabled"); 
+    
+    /* Nominal Case: Set Configuration (Not Impl) */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_SET_CONFIGURATION, 0, 0, CFE_PSP_IODriver_U32ARG(0)); 
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Nominal Case: Set Configuration");
+
+    /* Nominal Case: Get Configuration (Not Impl) */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_GET_CONFIGURATION, 0, 0, CFE_PSP_IODriver_U32ARG(0)); 
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Nominal Case: Get Configuration");
+
+    /* Nominal Case: Look Up per-cpu Subsystem */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_LOOKUP_SUBSYSTEM, 0, 0, 
+                                           CFE_PSP_IODriver_CONST_STR("per-cpu"));
+    UtAssert_True(StatusCode == 1, "Nominal Case: Look up per-cpu subsytem");
+
+    /* Nominal Case: Look Up aggregate Subsystem */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_LOOKUP_SUBSYSTEM, 0, 0, 
+                                           CFE_PSP_IODriver_CONST_STR("aggregate"));
+    UtAssert_True(StatusCode == 0, "Nominal Case: Look up aggregate subsytem");
+
+    /* Nominal Case: Look Up cpu-load subchannel */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_LOOKUP_SUBCHANNEL, 0, 0, 
+                                           CFE_PSP_IODriver_CONST_STR("cpu-load"));
+    UtAssert_True(StatusCode == 0, "Nominal Case: Look up cpu-load subchannel");
+
+    /* Nominal Case: Query Direction */
+    QueryDirArg = CFE_PSP_IODriver_Direction_DISABLED;
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_QUERY_DIRECTION, 0, 0, CFE_PSP_IODriver_VPARG(&QueryDirArg));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: VxWorks Sysmon Driver Query Direction Status Code");
+    UtAssert_True(QueryDirArg == CFE_PSP_IODriver_Direction_INPUT_ONLY, "Nominal Case: VxWorks Sysmon Direction (INPUT ONLY)");
+
+    /* Nominal Case: Analog IO Read Channel */
+    Sample = -1;
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_READ_CHANNELS, 0, 0, CFE_PSP_IODriver_VPARG(&RdWr));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: VxWorks Sysmon Aggregate CPU Load Status Code");
+    UtAssert_True(Sample == 0, "Nominal Case: VxWorks Sysmon Aggregate CPU");
+
+}
+
+void Test_Aggregate_Error(void)
+{
+    CFE_PSP_IODriver_API_t *EntryAPI = TgtAPI->ExtendedApi;
+    int32 StatusCode;
+    int32 IsRunningStatus;
+    CFE_PSP_IODriver_AdcCode_t     Sample;
+    CFE_PSP_IODriver_AnalogRdWr_t  RdWr = {.NumChannels = 1, .Samples = &Sample};; 
+
+    /* Error Case: Look Up Subsystem Not Found */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_LOOKUP_SUBSYSTEM, 0, 0, 
+                                           CFE_PSP_IODriver_CONST_STR("Empty"));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Error Case: Subsystem Not Found");
+
+    /* Error Case: Look Up Subchannel Not Found */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_LOOKUP_SUBCHANNEL, 0, 0, 
+                                           CFE_PSP_IODriver_CONST_STR("Empty"));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Error Case: Subchannel Not Found");
+
+    /* Error Case: NULL Query Direction */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_QUERY_DIRECTION, 0, 0, CFE_PSP_IODriver_VPARG(NULL));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Error Case: NULL Query Direction Status Code");
+
+    /* Error Case: Analog IO Read, Wrong Channel Number */
+    Sample = -1;
+    RdWr.NumChannels = 0;
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_READ_CHANNELS, 0, 0, CFE_PSP_IODriver_VPARG(&RdWr));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Error Case: Analog IO Read, Wrong Channel Number");
+
+    /* Error Case: Analog IO Read, Wrong Channel Subchannel */
+    Sample = -1;
+    RdWr.NumChannels = 1;
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_READ_CHANNELS, 0, 5, CFE_PSP_IODriver_VPARG(&RdWr));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Error Case: Analog IO Read, Wrong Subchannel");
+
+    /* Error Case: Command Code Not Found */
+    StatusCode = EntryAPI->DeviceCommand(40, 0, 0, CFE_PSP_IODriver_U32ARG(0)); 
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Error Case: Aggregated Substem, Bad Command Code");
+
+    /* Error Case: Unable To Start Child Process */
+    UT_SetDeferredRetcode(UT_KEY(OS_TaskCreate), 1, OS_ERROR);
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_SET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    IsRunningStatus = EntryAPI->DeviceCommand(CFE_PSP_IODriver_GET_RUNNING, 0, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR, "Error Case: Creating Child Process, Status Code");
+    UtAssert_True(IsRunningStatus == false, "Error Case: Creating Child Process, Running Status");
+}
+
+void Test_Dispatch_Nominal(void)
+{
+    CFE_PSP_IODriver_API_t *EntryAPI = TgtAPI->ExtendedApi;
+    CFE_PSP_IODriver_AdcCode_t     Sample[2];
+    CFE_PSP_IODriver_AnalogRdWr_t  RdWr = {.NumChannels = 1, .Samples = Sample};
+    int32 StatusCode;
+
+    /* Nominal Case: Dispatch IO Driver NOOP */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_NOOP, 1, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: Dispatch IO Driver NOOP ");
+
+    /* Nominal Case: Dispatch Analog IO NOOP */
+    StatusCode = EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_NOOP, 1, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_SUCCESS, "Nominal Case: Dispatch Analog IO NOOP");
+
+    /* Nominal Case: Dispatch Analog Read Channels */
+    Sample[0] = -1;
+    Sample[1] = -1;
+    EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_READ_CHANNELS, 1, 0, CFE_PSP_IODriver_VPARG(&RdWr));
+    UtAssert_True(Sample[0] == 0 && Sample[1] == -1, "Nominal Case: Dispatch cpuload");
+}
+
+void Test_Dispatch_Error(void)
+{
+    CFE_PSP_IODriver_API_t *EntryAPI = TgtAPI->ExtendedApi;
+    CFE_PSP_IODriver_AdcCode_t     Sample[2];
+    CFE_PSP_IODriver_AnalogRdWr_t  RdWr = {.NumChannels = 1, .Samples = Sample};
+    int StatusCode;
+
+    /* Error Case: Dispatch Analog Read Channels, Subchannel >= Max Cpu */
+    /* Default max cpu == 1 */
+    Sample[0] = -1;
+    Sample[1] = -1;
+    EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_READ_CHANNELS, 1, 2, CFE_PSP_IODriver_VPARG(&RdWr));
+    UtAssert_True(Sample[0] == -1 && Sample[1] == -1, "Error Case: Dispatch cpuload, subchannel >= max cpu");
+
+    /* Error Case: Dispatch Analog Read Channels, NumChannels > max cpu */
+    RdWr.NumChannels = 2;
+    EntryAPI->DeviceCommand(CFE_PSP_IODriver_ANALOG_IO_READ_CHANNELS, 1, 0, CFE_PSP_IODriver_VPARG(&RdWr));
+    UtAssert_True(Sample[0] == -1 && Sample[1] == -1, "Error Case: Dispatch cpuload, NumChannels > max cpu");
+
+    /* Error Case: Command Code Not Found */
+    StatusCode = EntryAPI->DeviceCommand(10, 1, 0, CFE_PSP_IODriver_U32ARG(1));
+    UtAssert_True(StatusCode == CFE_PSP_ERROR_NOT_IMPLEMENTED, "Error Case: Command Code Not Found");
+}
+
+/*
+ * Macro to add a test case to the list of tests to execute
+ */
+#define ADD_TEST(test) UtTest_Add(test, ModuleTest_ResetState, NULL, #test)
+
+/*
+ * Register the test cases to execute with the unit test tool
+ */
+void UtTest_Setup(void)
+{
+    ADD_TEST(Test_Entry_Nominal);
+    ADD_TEST(Test_Aggregate_Nominal);
+    ADD_TEST(Test_Aggregate_Error);
+    ADD_TEST(Test_Dispatch_Nominal);
+    ADD_TEST(Test_Dispatch_Error);
+}
diff --git a/unit-test-coverage/ut-stubs/CMakeLists.txt b/unit-test-coverage/ut-stubs/CMakeLists.txt
index c9c1c91d..3f9aeb2e 100644
--- a/unit-test-coverage/ut-stubs/CMakeLists.txt
+++ b/unit-test-coverage/ut-stubs/CMakeLists.txt
@@ -49,6 +49,8 @@ add_library(ut_psp_libc_stubs STATIC EXCLUDE_FROM_ALL
     src/vxworks-rebootLib-stubs.c
     src/vxworks-sysLib-stubs.c
     src/vxworks-vxLib-stubs.c
+    src/vxworks-spyLib-stubs.c
+    src/vxworks-spyLibP-stubs.c
 )
     
 target_include_directories(ut_libc_stubs PUBLIC 
diff --git a/unit-test-coverage/ut-stubs/inc/PCS_spyLib.h b/unit-test-coverage/ut-stubs/inc/PCS_spyLib.h
new file mode 100644
index 00000000..088ec671
--- /dev/null
+++ b/unit-test-coverage/ut-stubs/inc/PCS_spyLib.h
@@ -0,0 +1,39 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: Bootes”
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ************************************************************************/
+
+/* PSP coverage stub replacement for spyLib.h */
+#ifndef PCS_SPYLIB_H
+#define PCS_SPYLIB_H
+
+#include "PCS_basetypes.h"
+#include "PCS_vxWorks.h"
+
+/* ----------------------------------------- */
+/* constants normally defined in spyLib.h */
+/* ----------------------------------------- */
+
+/* ----------------------------------------- */
+/* types normally defined in spyLib.h */
+/* ----------------------------------------- */
+
+/* ----------------------------------------- */
+/* prototypes normally declared in spyLib.h */
+/* ----------------------------------------- */
+void PCS_spyLibInit(int maxTasks);
+
+#endif
diff --git a/unit-test-coverage/ut-stubs/inc/PCS_spyLibP.h b/unit-test-coverage/ut-stubs/inc/PCS_spyLibP.h
new file mode 100644
index 00000000..f7d5c71e
--- /dev/null
+++ b/unit-test-coverage/ut-stubs/inc/PCS_spyLibP.h
@@ -0,0 +1,42 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: Bootes”
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ************************************************************************/
+
+/* PSP coverage stub replacement for spyLibP.h */
+#ifndef PCS_SPYLIBP_H
+#define PCS_SPYLIBP_H
+
+#include "PCS_basetypes.h"
+#include "PCS_vxWorks.h"
+
+/* ----------------------------------------- */
+/* constants normally defined in spyLibP.h */
+/* ----------------------------------------- */
+
+/* ----------------------------------------- */
+/* types normally defined in spyLibP.h */
+/* ----------------------------------------- */
+
+/* ----------------------------------------- */
+/* prototypes normally declared in spyLibP.h */
+/* ----------------------------------------- */
+void PCS_spyReportCommon(PCS_FUNCPTR print);
+void PCS_spyClkStopCommon(void);
+int  PCS_spyClkStartCommon(int intsPerSec, PCS_FUNCPTR print);
+
+
+#endif
diff --git a/unit-test-coverage/ut-stubs/inc/PCS_stdarg.h b/unit-test-coverage/ut-stubs/inc/PCS_stdarg.h
index aa112293..69524342 100644
--- a/unit-test-coverage/ut-stubs/inc/PCS_stdarg.h
+++ b/unit-test-coverage/ut-stubs/inc/PCS_stdarg.h
@@ -40,5 +40,6 @@ typedef struct
 
 #define PCS_va_start(ap, last) ap.p = &last
 #define PCS_va_end(ap)
+#define PCS_va_arg(ap, type) (ap.p = (char *)ap.p + sizeof(type), (type) 0) /* FIXME */
 
 #endif
diff --git a/unit-test-coverage/ut-stubs/inc/PCS_stdio.h b/unit-test-coverage/ut-stubs/inc/PCS_stdio.h
index 9636800f..dd00db45 100644
--- a/unit-test-coverage/ut-stubs/inc/PCS_stdio.h
+++ b/unit-test-coverage/ut-stubs/inc/PCS_stdio.h
@@ -46,6 +46,7 @@ extern int       PCS_snprintf(char *s, size_t maxlen, const char *format, ...);
 extern int       PCS_vsnprintf(char *s, size_t maxlen, const char *format, PCS_va_list arg);
 extern int       PCS_printf(const char *format, ...);
 extern int       PCS_putchar(int c);
+extern void      PCS_perror(const char *str);
 
 extern PCS_FILE *PCS_stdin;
 extern PCS_FILE *PCS_stdout;
diff --git a/unit-test-coverage/ut-stubs/override_inc/private/spyLibP.h b/unit-test-coverage/ut-stubs/override_inc/private/spyLibP.h
new file mode 100644
index 00000000..a900d71a
--- /dev/null
+++ b/unit-test-coverage/ut-stubs/override_inc/private/spyLibP.h
@@ -0,0 +1,33 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: Bootes”
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ************************************************************************/
+
+/* PSP coverage stub replacement for spyLibP.h */
+#ifndef OVERRIDE_SPYLIBP_H
+#define OVERRIDE_SPYLIBP_H
+
+#include "PCS_spyLibP.h"
+#include <vxWorks.h>
+
+/* ----------------------------------------- */
+/* mappings for declarations in spyLibP.h */
+/* ----------------------------------------- */
+#define spyReportCommon    PCS_spyReportCommon
+#define spyClkStartCommon  PCS_spyClkStartCommon
+#define spyClkStopCommon   PCS_spyClkStopCommon
+
+#endif
diff --git a/unit-test-coverage/ut-stubs/override_inc/spyLib.h b/unit-test-coverage/ut-stubs/override_inc/spyLib.h
new file mode 100644
index 00000000..0819ad20
--- /dev/null
+++ b/unit-test-coverage/ut-stubs/override_inc/spyLib.h
@@ -0,0 +1,34 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: Bootes”
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ************************************************************************/
+
+/* PSP coverage stub replacement for spyLib.h */
+#ifndef OVERRIDE_SPYLIB_H
+#define OVERRIDE_SPYLIB_H
+
+#include "PCS_spyLib.h"
+#include <vxWorks.h>
+
+/* ----------------------------------------- */
+/* mappings for declarations in spyLib.h */
+/* ----------------------------------------- */
+
+#define spyLibInit     PCS_spyLibInit
+
+
+
+#endif
diff --git a/unit-test-coverage/ut-stubs/override_inc/stdarg.h b/unit-test-coverage/ut-stubs/override_inc/stdarg.h
index 0152b1f5..a2d72bf5 100644
--- a/unit-test-coverage/ut-stubs/override_inc/stdarg.h
+++ b/unit-test-coverage/ut-stubs/override_inc/stdarg.h
@@ -29,5 +29,6 @@
 #define va_list            PCS_va_list
 #define va_start(ap, last) PCS_va_start(ap, last)
 #define va_end(ap)         PCS_va_end(ap)
+#define va_arg(ap, type)   PCS_va_arg(ap, type)
 
 #endif
diff --git a/unit-test-coverage/ut-stubs/override_inc/stdio.h b/unit-test-coverage/ut-stubs/override_inc/stdio.h
index 7bff6b00..a55da486 100644
--- a/unit-test-coverage/ut-stubs/override_inc/stdio.h
+++ b/unit-test-coverage/ut-stubs/override_inc/stdio.h
@@ -37,6 +37,7 @@
 #define vsnprintf   PCS_vsnprintf
 #define printf(...) PCS_printf(__VA_ARGS__)
 #define putchar     PCS_putchar
+#define perror      PCS_perror
 
 #define stdin  PCS_stdin
 #define stdout PCS_stdout
diff --git a/unit-test-coverage/ut-stubs/src/libc-stdio-stubs.c b/unit-test-coverage/ut-stubs/src/libc-stdio-stubs.c
index 702afe42..d5f43c3b 100644
--- a/unit-test-coverage/ut-stubs/src/libc-stdio-stubs.c
+++ b/unit-test-coverage/ut-stubs/src/libc-stdio-stubs.c
@@ -194,6 +194,11 @@ int PCS_printf(const char *format, ...)
     return UT_DEFAULT_IMPL(PCS_printf);
 }
 
+void PCS_perror(const char * str)
+{
+    /* No implmentation */
+}
+
 static PCS_FILE LOCAL_FP[3] = {{10}, {11}, {12}};
 
 PCS_FILE *PCS_stdin  = &LOCAL_FP[0];
diff --git a/unit-test-coverage/ut-stubs/src/vxworks-spyLib-stubs.c b/unit-test-coverage/ut-stubs/src/vxworks-spyLib-stubs.c
new file mode 100644
index 00000000..ef22cbb2
--- /dev/null
+++ b/unit-test-coverage/ut-stubs/src/vxworks-spyLib-stubs.c
@@ -0,0 +1,31 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: Bootes”
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ************************************************************************/
+
+/* PSP coverage stub replacement for spyLib.h */
+#include <string.h>
+#include <stdlib.h>
+#include "utstubs.h"
+
+#include "PCS_spyLib.h"
+
+
+void PCS_spyLibInit(int maxTasks)
+{
+    /* Not Implment */
+}
+
diff --git a/unit-test-coverage/ut-stubs/src/vxworks-spyLibP-stubs.c b/unit-test-coverage/ut-stubs/src/vxworks-spyLibP-stubs.c
new file mode 100644
index 00000000..e70ea0fe
--- /dev/null
+++ b/unit-test-coverage/ut-stubs/src/vxworks-spyLibP-stubs.c
@@ -0,0 +1,40 @@
+/************************************************************************
+ * NASA Docket No. GSC-18,719-1, and identified as “core Flight System: Bootes”
+ *
+ * Copyright (c) 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ************************************************************************/
+
+/* PSP coverage stub replacement for spyLibP.h */
+#include <string.h>
+#include <stdlib.h>
+#include "utstubs.h"
+
+#include "PCS_spyLibP.h"
+
+void PCS_spyReportCommon(PCS_FUNCPTR print)
+{
+    /* Not Implement */
+}
+
+void PCS_spyClkStopCommon(void)
+{
+    /* Not Implement */
+}
+
+int  PCS_spyClkStartCommon(int intsPerSec, PCS_FUNCPTR print)
+{
+    return PCS_OK;
+}
+