Make phpunit fail on deprecation warnings (#989)

(cherry picked from commit 4d36e9c16f4820c2ed9360bc818982f3c02a08f5)

.github/workflows/main.yml

@@ -46,6 +46,7 @@ jobs:
         with:
           coverage: "none"
           php-version: "${{ matrix.php-version }}"
+          ini-file: "development"
           tools: composer:v2
       - name: "Install dependencies"
         run: "composer update --no-progress --prefer-dist ${{ matrix.flags }}"
@@ -62,6 +63,7 @@ jobs:
         with:
           coverage: "none"
           php-version: "8.2"
+          ini-file: "development"
           tools: composer:v2
       - name: "Install PHP 8 dependencies"
         run: "composer update --no-progress --prefer-dist"
@@ -78,6 +80,7 @@ jobs:
         with:
           coverage: "none"
           php-version: "7.4"
+          ini-file: "development"
           tools: composer:v2
       - name: "Install PHP 8 dependencies"
         run: "composer update --no-progress --prefer-dist"

phpunit.xml.dist

@@ -4,6 +4,7 @@
          xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
          backupGlobals="false"
          colors="true"
+         convertDeprecationsToExceptions="true"
          beStrictAboutTestsThatDoNotTestAnything="false"
          bootstrap="./test/bootstrap.php">
     <testsuites>