Added multiple php versions to test (#22)

* Added multiple php versions to test

* Update composer.json

* Allow phpunit 8

* Allow phpunit 7

.github/workflows/tests.yml

@@ -1,24 +1,24 @@
+
 name: Tests
 
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
+on: [push, pull_request]
 
 jobs:
-  build:
-
+  run:
     runs-on: ubuntu-latest
 
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Validate composer.json and composer.lock
-        run: composer validate
+    strategy:
+      matrix:
+        php: [7.1, 7.2, 7.3, 7.4]
 
-      - name: Install dependencies
-        run: composer install --prefer-dist --no-progress
+    name: PHP ${{ matrix.php }}
 
-      - name: PHPUnit
-        run: composer test
+    steps:
+    - uses: actions/checkout@v2
+    - uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        coverage: xdebug
+    - run: composer validate
+    - run: composer install --prefer-dist --no-interaction
+    - run: vendor/bin/phpunit --coverage-text

composer.json

@@ -34,10 +34,7 @@
     }
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.1",
+    "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0",
     "10up/wp_mock": "^0.4.2"
-  },
-  "scripts": {
-    "test": "phpunit"
   }
 }