diff --git a/sorc/ocean_merge.fd/CMakeLists.txt b/sorc/ocean_merge.fd/CMakeLists.txt
index 60d0a6b46..e5d1e4b10 100644
--- a/sorc/ocean_merge.fd/CMakeLists.txt
+++ b/sorc/ocean_merge.fd/CMakeLists.txt
@@ -1,6 +1,5 @@
-list(APPEND fortran_src
-  merge_lake_ocnmsk.f90
-)
+set(lib_src utils.F90 namelist.F90)
+set(exe_src merge_lake_ocnmsk.F90)
 
 if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -i4 -convert big_endian")
@@ -12,12 +11,17 @@ elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
 endif()
 
 set(exe_name ocean_merge)
-add_executable(${exe_name} ${fortran_src})
+
+add_library(om_lib STATIC ${lib_src})
+add_executable(${exe_name} ${exe_src})
+
 target_link_libraries(
-  ${exe_name}
-  
+  om_lib
+  PUBLIC
   NetCDF::NetCDF_Fortran)
 
+target_link_libraries(${exe_name} PRIVATE om_lib)
+
 install(TARGETS ${exe_name})
 
 # If doxygen documentation we enabled, build it.
diff --git a/sorc/ocean_merge.fd/merge_lake_ocnmsk.f90 b/sorc/ocean_merge.fd/merge_lake_ocnmsk.F90
similarity index 81%
rename from sorc/ocean_merge.fd/merge_lake_ocnmsk.f90
rename to sorc/ocean_merge.fd/merge_lake_ocnmsk.F90
index 9cba4088d..e8bf1b639 100644
--- a/sorc/ocean_merge.fd/merge_lake_ocnmsk.f90
+++ b/sorc/ocean_merge.fd/merge_lake_ocnmsk.F90
@@ -138,47 +138,3 @@ program merge_lake_ocnmsk
   write(*,'(a,i8,a,i8,a)') 'total lake point ',lake_pt,' where ',nodp_pt,' has no depth'
 
 end program merge_lake_ocnmsk
-
-!> Handle netCDF errors.
-!!
-!! @param[in] ret NetCDF return code.
-!! @author Shan Sun
-subroutine handle_err (ret)
-  use netcdf
-  integer, intent(in) :: ret
-
-  if (ret /= NF90_NOERR) then
-    write(6,*) nf90_strerror (ret)
-    stop 999
-  end if
-end subroutine handle_err
-
-!> Read program namelist.
-!!
-!! @param[out] ocean_mask_dir Directory containing MOM6 ocean mask file.
-!! @param[out] lake_mask_dir Directory containing the lake mask file.
-!! @param[out] out_dir Directory where output file will be written.
-!! @param[out] atmres Atmosphere grid resolution.
-!! @param[out] ocnres Ocean grid resolution.
-!! @param[out] binary_lake or fractional lake 
-!! @author Rahul Mahajan
-!! @author Sanath Kumar
-subroutine read_nml(ocean_mask_dir, lake_mask_dir, atmres,ocnres,out_dir,binary_lake)
-
-  integer :: unit=7, io_status
-
-  character(len=120), intent(out) :: ocean_mask_dir
-  character(len=120), intent(out) :: lake_mask_dir
-  character(len=120), intent(out) :: out_dir
-  character(len=10),  intent(out) :: atmres,ocnres
-  integer, intent(out):: binary_lake
-
-  namelist/mask_nml/ocean_mask_dir, lake_mask_dir, atmres, ocnres,out_dir,binary_lake
-  open(unit=unit, file='input.nml', iostat=io_status )
-  read(unit,mask_nml, iostat=io_status )
-  close(unit)
-  if (io_status > 0) then
-        print *,'Error reading input.nml' 
-        call handle_err(-1)
-  end if      
-end subroutine read_nml
diff --git a/sorc/ocean_merge.fd/namelist.F90 b/sorc/ocean_merge.fd/namelist.F90
new file mode 100644
index 000000000..3db2c1ad5
--- /dev/null
+++ b/sorc/ocean_merge.fd/namelist.F90
@@ -0,0 +1,29 @@
+!> Read program namelist.
+!!
+!! @param[out] ocean_mask_dir Directory containing MOM6 ocean mask file.
+!! @param[out] lake_mask_dir Directory containing the lake mask file.
+!! @param[out] out_dir Directory where output file will be written.
+!! @param[out] atmres Atmosphere grid resolution.
+!! @param[out] ocnres Ocean grid resolution.
+!! @param[out] binary_lake or fractional lake 
+!! @author Rahul Mahajan
+!! @author Sanath Kumar
+subroutine read_nml(ocean_mask_dir, lake_mask_dir, atmres,ocnres,out_dir,binary_lake)
+
+  integer :: unit=7, io_status
+
+  character(len=120), intent(out) :: ocean_mask_dir
+  character(len=120), intent(out) :: lake_mask_dir
+  character(len=120), intent(out) :: out_dir
+  character(len=10),  intent(out) :: atmres,ocnres
+  integer, intent(out):: binary_lake
+
+  namelist/mask_nml/ocean_mask_dir, lake_mask_dir, atmres, ocnres,out_dir,binary_lake
+  open(unit=unit, file='input.nml', iostat=io_status )
+  read(unit,mask_nml, iostat=io_status )
+  close(unit)
+  if (io_status > 0) then
+        print *,'Error reading input.nml' 
+        call handle_err(-1)
+  end if      
+end subroutine read_nml
diff --git a/sorc/ocean_merge.fd/utils.F90 b/sorc/ocean_merge.fd/utils.F90
new file mode 100644
index 000000000..570f03cfa
--- /dev/null
+++ b/sorc/ocean_merge.fd/utils.F90
@@ -0,0 +1,13 @@
+!> Handle netCDF errors.
+!!
+!! @param[in] ret NetCDF return code.
+!! @author Shan Sun
+subroutine handle_err (ret)
+  use netcdf
+  integer, intent(in) :: ret
+
+  if (ret /= NF90_NOERR) then
+    write(6,*) nf90_strerror (ret)
+    stop 999
+  end if
+end subroutine handle_err
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 95b28c8fe..a08411c3f 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -42,3 +42,4 @@ add_subdirectory(sfc_climo_gen)
 add_subdirectory(cpld_gridgen)
 add_subdirectory(emcsfc_snow2mdl)
 add_subdirectory(ocnice_prep)
+add_subdirectory(ocean_merge)
diff --git a/tests/ocean_merge/CMakeLists.txt b/tests/ocean_merge/CMakeLists.txt
new file mode 100644
index 000000000..24d4c1a8a
--- /dev/null
+++ b/tests/ocean_merge/CMakeLists.txt
@@ -0,0 +1,21 @@
+# This is the cmake build file for the tests directory of the
+# UFS_UTILS project.
+#
+# George Gayno
+
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -assume byterecl")
+elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8")
+endif()
+
+# Copy necessary test files from the source data directory to the
+# build data directory.
+
+execute_process( COMMAND ${CMAKE_COMMAND} -E copy
+    ${CMAKE_CURRENT_SOURCE_DIR}/data/input.nml ${CMAKE_CURRENT_BINARY_DIR}/input.nml)
+
+add_executable(ftst_read_nml ftst_read_nml.F90)
+target_link_libraries(ftst_read_nml om_lib)
+
+add_test(NAME ocean_merge-ftst_read_nml COMMAND ftst_read_nml)
diff --git a/tests/ocean_merge/data/input.nml b/tests/ocean_merge/data/input.nml
new file mode 100644
index 000000000..9a2c16208
--- /dev/null
+++ b/tests/ocean_merge/data/input.nml
@@ -0,0 +1,8 @@
+     &mask_nml
+     ocean_mask_dir="/ocean/mask/dir"
+     ocnres="mx025"
+     lake_mask_dir="/lake/mask/dir"
+     atmres="C96"
+     out_dir="/out/dir"
+     binary_lake=1
+    /
diff --git a/tests/ocean_merge/ftst_read_nml.F90 b/tests/ocean_merge/ftst_read_nml.F90
new file mode 100644
index 000000000..3765c2b10
--- /dev/null
+++ b/tests/ocean_merge/ftst_read_nml.F90
@@ -0,0 +1,29 @@
+! Unit test for the read_nml routine.
+
+ program read_namelist
+
+ implicit none
+
+ character(len=120) :: ocean_mask_dir
+ character(len=120) :: lake_mask_dir
+ character(len=120) :: out_dir
+ character(len=10)  :: atmres,ocnres
+ 
+ integer            :: binary_lake
+
+ print*,"Call routine read_nml."
+
+ call read_nml(ocean_mask_dir, lake_mask_dir, atmres,ocnres,out_dir,binary_lake)
+
+ if (trim(ocean_mask_dir) /= "/ocean/mask/dir") stop 2
+ if (trim(lake_mask_dir) /= "/lake/mask/dir") stop 4
+ if (trim(atmres) /= "C96") stop 6
+ if (trim(ocnres) /= "mx025") stop 8
+ if (trim(out_dir) /= "/out/dir") stop 8
+ if (binary_lake /= 1) stop 10
+
+ print*, "OK"
+
+ print*, "SUCCESS!"
+
+ end program read_namelist