diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1fcca33..27df8e7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,44 +1,41 @@
 
-name : Hello World Test
+name : Install CppUnit Test
 
 on :
   push :
     branches : [ "master", "develop" ]
 
 jobs :
-  hello_world_job :
+  install_cppunit_job:
     runs-on : ubuntu-latest
-    name : A job to say hello
+    name : install CppUnit
 
     strategy :
       fail-fast : false
 
       matrix :
-        who-args : [ 'Mona the Octocat', 'Second' ]
+        with-cppunit :
+          - no
+          - tools/cppunit
 
     steps :
       - uses : actions/checkout@v4
 
-      - id : foo
-        uses : takahiro-itou/hello-world-composite-action@master
-        with :
-          who-to-greet : ${{ matrix.who-args }}
-
-      - run   : echo random-number "$RANDOM_NUMBER"
+      - name : Print Install Dir
+        run : |
+          echo "workspace = ${{ github.workspace }}"
+          echo "target    = ${{ matrix.with-cppunit }}"
         shell : bash
-        env   :
-          RANDOM_NUMBER : ${{ steps.foo.outputs.random-number }}
 
-      - run   : |
-          echo common-value "${COMMON_VALUE}"
-          echo cached-date  "${CACHED_DATE}"
-        shell : bash
-        env   :
-          COMMON_VALUE : ${{ steps.foo.outputs.common-value }}
-          CACHED_DATE  : ${{ steps.foo.outputs.cached-date }}
+      - if : ${{ matrix.with-cppunit != 'no' }}
+        name : Install CppUnit
+        uses : takahiro-itou/install-cppunit-action@v1
+        with :
+          install-prefix : "${{ github.workspace }}/${{ matrix.with-cppunit }}"
 
-      - run : |
+      - name : Post-Show Workspace
+        run : |
           pwd
-          ls -alR
-          md5sum -b ./init/*.txt
+          echo "${{ github.workspace }}"
+          ls -lR "${{ github.workspace }}"
         shell : bash