diff --git a/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-1.3.0.yml b/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-1.3.0.yml
index efb87d9cd..6883a6cec 100644
--- a/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-1.3.0.yml
+++ b/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-1.3.0.yml
@@ -124,6 +124,7 @@ jobs:
         mkdir build && cd build
         cmake .. -DCMAKE_PREFIX_PATH='~;~/jasper;~/nceplibs'
         make -j2
+        make test
 
 
     
diff --git a/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-develop.yml b/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-develop.yml
index 3ff50dc7d..cd2beb295 100644
--- a/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-develop.yml
+++ b/.github/workflows/esmf-8.0.1_jasper-2.0.22_nceplibs-develop.yml
@@ -115,6 +115,7 @@ jobs:
         mkdir build && cd build
         cmake .. -DCMAKE_PREFIX_PATH='~;~/jasper'
         make -j2
+        make test
 
 
     
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9677e6c2a..266ec8c27 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,8 @@ if(NOT CMAKE_BUILD_TYPE MATCHES "^(Debug|Release|RelWithDebInfo|MinSizeRel)$")
       CACHE STRING "Choose the type of build." FORCE)
   set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release"
                                                "MinSizeRel" "RelWithDebInfo")
+  message(STATUS "Set BUILD_TESTING to YES and build unit testing package under tests")
+  set(BUILD_TESTING "YES")
 endif()
 
 # Set compiler flags.
@@ -73,6 +75,12 @@ endif()
 
 add_subdirectory(sorc)
 
+# Run unit tests.
+include(CTest)
+if(BUILD_TESTING)
+  add_subdirectory(tests)
+endif()
+
 # If doxygen documentation we enabled, build it.
 if(ENABLE_DOCS)
   find_package(Doxygen REQUIRED)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
new file mode 100644
index 000000000..e1478e2e5
--- /dev/null
+++ b/tests/CMakeLists.txt
@@ -0,0 +1,8 @@
+# This is the CMake file for the tests directory of the UFS_UTILS
+# project.
+#
+# Ed Hartnett 2/11/21
+
+# Add the test subdirecotries.
+add_subdirectory(chres_cube)
+
diff --git a/tests/chres_cube/CMakeLists.txt b/tests/chres_cube/CMakeLists.txt
new file mode 100644
index 000000000..f7c3b64ae
--- /dev/null
+++ b/tests/chres_cube/CMakeLists.txt
@@ -0,0 +1,42 @@
+# This is the cmake build file for the tests directory of the
+# UFS_UTILS project.
+#
+# George Gayno, Lin Gan, Ed Hartnett
+
+set(fortran_src
+    "${CMAKE_SOURCE_DIR}/sorc/chgres_cube.fd/utils.f90"
+    ftst_utils.F90)
+
+if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -convert big_endian -assume byterecl")
+elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
+  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8 -fconvert=big-endian")
+endif()
+
+include_directories(
+      ${PROJECT_SOURCE_DIR}
+)
+
+set(exe_name ftst_utils)
+add_executable(${exe_name} ${fortran_src})
+add_test(NAME ftst_utils COMMAND ftst_utils)
+target_link_libraries(
+  ftst_utils
+  nemsio::nemsio
+  sfcio::sfcio
+  sigio::sigio
+  bacio::bacio_4
+  sp::sp_d
+  w3nco::w3nco_d
+  esmf
+  wgrib2::wgrib2_lib
+  wgrib2::wgrib2_api
+  MPI::MPI_Fortran
+  NetCDF::NetCDF_Fortran)
+if(OpenMP_Fortran_FOUND)
+  target_link_libraries(ftst_utils OpenMP::OpenMP_Fortran)
+endif()
+
+
+
+
diff --git a/tests/chres_cube/ftst_utils.F90 b/tests/chres_cube/ftst_utils.F90
new file mode 100644
index 000000000..696552dd1
--- /dev/null
+++ b/tests/chres_cube/ftst_utils.F90
@@ -0,0 +1,48 @@
+! Unit test for to_upper() and to_lower() functions under UFS_UTILS
+! package, chres_cube utility.
+!
+! Lin Gan NCEP/EMC
+ 
+program ftst_utils
+
+ 
+ implicit none
+
+ logical                          :: match_result
+
+ character(len=12)                :: test_input_char_1, test_input_char_2, u_st_base, l_st_base
+
+ u_st_base="STAGGERLOCCE"
+ l_st_base="staggerlocce"
+ test_input_char_1="sTAGGErLOCCE"
+ test_input_char_2="staGGErLOCCE"
+
+ print*, "Starting Unit Testing to_upper_lower."
+ print*, "testing to_lower and to_upper..."
+
+!-------------------------------------------------------------------------
+! Execute testing below by running target function with testing string 
+!   When match_result set to be T - compare to base line is identical
+!   When match_result set to be F - compare to base line is NOT identical
+!-------------------------------------------------------------------------
+
+ call to_lower(test_input_char_1) 
+ match_result = test_input_char_1 == l_st_base
+ if (.not.match_result) then
+   stop
+ endif
+
+ call to_upper(test_input_char_2)
+ match_result = test_input_char_2 == u_st_base
+ if (.not.match_result) then
+   stop
+ endif
+
+!-------------------------------------------------------------------------
+! Display final result
+!-------------------------------------------------------------------------
+
+ print*, "OK"
+ print*, "SUCCESS!"
+
+end program ftst_utils