Update Unit Testing to run on multiple Operating Systems.

Author: brownts

.github/workflows/unit_test.yml

@@ -1,14 +1,13 @@
 name: Unit Test Project
 on:
   push:
-    paths:
-      - '**.ts'
   pull_request:
-    paths:
-      - '**.ts'
 jobs:
   unit_test:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout
       uses: actions/checkout@v3