chore: change phpunit version according to php

Author: KentarouTakeda

.github/workflows/ci.yml

@@ -21,6 +21,9 @@ jobs:
           - '8.1'
           - '8.2'
           - '8.3'
+        include:
+          - php: '7.2'
+            phpunit: '"^7||^8"'
 
     steps:
       - name: Set up PHP
@@ -33,6 +36,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
+      - name: "Install specific version of phpunit "
+        if: ${{ matrix.phpunit  }}
+        run: composer require --no-interaction --no-progress --no-suggest phpunit/phpunit:${{ matrix.phpunit }}
 
       - name: "Install lowest dependencies"
         if: ${{ matrix.dependencies == 'lowest' }}
@@ -49,6 +55,13 @@ jobs:
     name: Codestyle check on PHP 7.2
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        php:
+          - '7.2'
+        phpunit:
+          - '"^7||^8"'
+
     steps:
       - name: Set up PHP
         uses: shivammathur/setup-php@2.1.0
@@ -58,6 +71,10 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
+      - name: "Install specific version of phpunit "
+        if: ${{ matrix.phpunit  }}
+        run: composer require --no-interaction --no-progress --no-suggest phpunit/phpunit:${{ matrix.phpunit }}
+
       - name: Download dependencies
         run: composer update --no-interaction --prefer-dist --optimize-autoloader --prefer-stable
 
@@ -72,6 +89,8 @@ jobs:
       matrix:
         php:
           - '7.2'
+        phpunit:
+          - '"^7||^8"'
 
     steps:
       - name: Set up PHP
@@ -82,6 +101,10 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
+      - name: "Install specific version of phpunit "
+        if: ${{ matrix.phpunit  }}
+        run: composer require --no-interaction --no-progress --no-suggest phpunit/phpunit:${{ matrix.phpunit }}
+
       - name: Download dependencies
         run: composer update --no-interaction --prefer-dist --optimize-autoloader --prefer-stable
 

composer.json

@@ -41,7 +41,7 @@
         "phpstan/phpstan": "^1",
         "phpstan/phpstan-phpunit": "^1",
         "phpstan/phpstan-webmozart-assert": "^1",
-        "phpunit/phpunit": "^7 || ^8 || ^9",
+        "phpunit/phpunit": "^9",
         "symfony/cache": "^5.1"
     },
     "config": {