New function: getObject() (#37)

* test: implement unit tests

* refactor: remove unused getClass function

* feature: getObject
closes #36

* ci: upgrade workflow

* test: upgrade phpunit

Author: Greg Bowler

.github/workflows/ci.yml

@@ -7,21 +7,21 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Cache Composer dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: /tmp/composer-cache
           key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
 
-      - uses: php-actions/composer@v5
+      - uses: php-actions/composer@v6
 
       - name: Archive build
         run: mkdir /tmp/github-actions/ && tar -cvf /tmp/github-actions/build.tar ./
 
       - name: Upload build archive for test runners
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: build-artifact
           path: /tmp/github-actions
@@ -31,7 +31,7 @@ jobs:
     needs: [composer]
 
     steps:
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v3
         with:
           name: build-artifact
           path: /tmp/github-actions
@@ -40,7 +40,7 @@ jobs:
         run: tar -xvf /tmp/github-actions/build.tar ./
 
       - name: PHP Static Analysis
-        uses: php-actions/phpstan@v2
+        uses: php-actions/phpstan@v3
         with:
           path: src/
 
@@ -49,7 +49,7 @@ jobs:
     needs: [ composer ]
 
     steps:
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v3
         with:
           name: build-artifact
           path: /tmp/github-actions