Run test with multiple php versions

Author: K-Adam

.editorconfig

@@ -8,3 +8,7 @@ indent_style = space
 insert_final_newline = true
 max_line_length = 120
 tab_width = 4
+
+[{*.yml, *.yaml}]
+indent_size = 2
+tab_width = 2

.github/workflows/phpunit.yml

@@ -1,22 +1,27 @@
 name: PHPUnit
 
-on: [push]
+on: [ push ]
 
 jobs:
   test:
+    strategy:
+      matrix:
+        php-version:
+          - '8.0'
+          - '8.1'
 
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+      - uses: actions/checkout@v2
 
-    - name: Setup PHP
-      uses: shivammathur/setup-php@v2
-      with:
-        php-version: '8.0'
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
 
-    - name: Install dependencies
-      run: composer install --prefer-dist --no-progress --no-suggest
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-suggest
 
-    - name: Run tests
-      run: composer run-script test
+      - name: Run tests
+        run: composer run-script test