Added unit tests and workflow call for same

.gitea/workflows/fib-test.yaml

@@ -21,6 +21,7 @@ jobs:
         with:
           go-version: '1.24.4'
           check-latest: true
-      - name: Build the fib app
+      - name: Test build
         run: go build
-      - run: echo "🍏 This job's status is ${{ job.status }}."
+      - name: Test functions module
+	run: go test ./functions -v