Upgrade PHPUnit from version 8 to 9

PHPUnit version 9 is the latest compatible with PHP 8.0. This PR updates the version in composer.json and migrates phpunit.xml.dist to reflect the version change. Additionally, the scripts section has been updated to set the XDEBUG_MODE parameter to coverage when needed.

.gitignore

@@ -2,11 +2,10 @@
 ### Composer template
 composer.phar
 /vendor/
-composer.lock
 
 # Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
 # You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
-# composer.lock
+composer.lock
 
 .phpunit.result.cache
 
@@ -16,4 +15,4 @@ composer.lock
 # but don't ignore the folder and composer.json
 # and configuration files.
 !/tests/fixtures/*/composer.json
-!/tests/fixtures/*/wp-translation-downloader.json
+!/tests/fixtures/*/wp-translation-downloader.json

composer.json

@@ -21,7 +21,7 @@
         "mikey179/vfsstream": "^v1.6.10",
         "composer/composer": "^2.3.7",
         "inpsyde/php-coding-standards": "^1.0.0",
-        "phpunit/phpunit": "^8.5.26",
+        "phpunit/phpunit": "^9.6.0",
         "vimeo/psalm": "^4.23.0",
         "ondram/ci-detector": "^4.1.0"
     },
@@ -48,7 +48,10 @@
         "behat": "@php ./vendor/bin/behat",
         "cs": "@php ./vendor/squizlabs/php_codesniffer/bin/phpcs",
         "psalm": "@php ./vendor/vimeo/psalm/psalm --no-cache --output-format=compact --find-unused-psalm-suppress",
-        "tests": "@php ./vendor/phpunit/phpunit/phpunit --coverage-text",
+        "tests": [
+            "@putenv XDEBUG_MODE=coverage",
+            "@php ./vendor/phpunit/phpunit/phpunit --coverage-text"
+        ],
         "tests:no-coverage": "@php ./vendor/phpunit/phpunit/phpunit --no-coverage",
         "tests:unit": "@php ./vendor/phpunit/phpunit/phpunit --testsuite Unit",
         "qa": [

phpunit.xml.dist

@@ -1,18 +1,16 @@
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.5/phpunit.xsd"
-         bootstrap="./tests/boot.php"
-         colors="true">
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./src</directory>
-            <exclude>
-                <directory>./vendor</directory>
-            </exclude>
-        </whitelist>
-    </filter>
-    <testsuites>
-        <testsuite name="Unit">
-            <directory suffix="Test.php">./tests/Unit/</directory>
-        </testsuite>
-    </testsuites>
-</phpunit>
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" bootstrap="./tests/boot.php" colors="true">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+    <exclude>
+      <directory>./vendor</directory>
+    </exclude>
+  </coverage>
+  <testsuites>
+    <testsuite name="Unit">
+      <directory suffix="Test.php">./tests/Unit/</directory>
+    </testsuite>
+  </testsuites>
+</phpunit>