Update PHPUnit configuration schema for PHPUnit 9.3

Author: SimonFrings

.gitattributes

@@ -3,4 +3,5 @@
 /.gitignore export-ignore
 /examples/ export-ignore
 /phpunit.xml.dist export-ignore
+/phpunit.xml.legacy export-ignore
 /tests/ export-ignore

.github/workflows/ci.yml

@@ -27,6 +27,9 @@ jobs:
           php-version: ${{ matrix.php }}
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
+        if: ${{ matrix.php >= 7.3 }}
+      - run: vendor/bin/phpunit --coverage-text -c phpunit.xml.legacy
+        if: ${{ matrix.php < 7.3 }}
 
   PHPUnit-hhvm:
     name: PHPUnit (HHVM)
@@ -36,6 +39,5 @@ jobs:
       - uses: azjezz/setup-hhvm@v1
         with:
           version: lts-3.30
-      - run: hhvm $(which composer) require phpunit/phpunit:^5 --dev --no-interaction # requires legacy phpunit
       - run: hhvm $(which composer) install
       - run: hhvm vendor/bin/phpunit

phpunit.xml.dist

@@ -1,14 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit bootstrap="vendor/autoload.php" colors="true">
+<!-- PHPUnit configuration file with new format for PHPUnit 9.3+ -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         cacheResult="false">
     <testsuites>
         <testsuite name="NDJSON test suite">
             <directory>./tests/</directory>
         </testsuite>
     </testsuites>
-    <filter>
-        <whitelist>
+    <coverage>
+        <include>
             <directory>./src/</directory>
-        </whitelist>
-    </filter>
-</phpunit>
+        </include>
+    </coverage>
+</phpunit>

phpunit.xml.legacy

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- PHPUnit configuration file with old format for PHPUnit 9.2 or older -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/4.8/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true">
+    <testsuites>
+        <testsuite name="NDJSON test suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory>./src/</directory>
+        </whitelist>
+    </filter>
+</phpunit>