Update PHPUnit configuration schema for PHPUnit 9.3

.gitattributes

@@ -2,5 +2,6 @@
 /.gitignore export-ignore
 /.travis.yml export-ignore
 /examples/ export-ignore
-/phpunit.xml.dist export-ignore
+/phpunit.xml export-ignore
+/phpunit-legacy.xml export-ignore
 /tests/ export-ignore

.travis.yml

@@ -23,4 +23,5 @@ install:
   - composer install
 
 script:
-  - vendor/bin/phpunit --coverage-text
+  - if [[ "$TRAVIS_PHP_VERSION" > "7.2" ]]; then vendor/bin/phpunit --coverage-text; fi
+  - if [[ "$TRAVIS_PHP_VERSION" < "7.3" ]]; then vendor/bin/phpunit --coverage-text -c phpunit-legacy.xml; fi

phpunit.xml.dist → phpunit-legacy.xml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit bootstrap="vendor/autoload.php" colors="true" cacheResult="false">
+<!-- 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="Flux test suite">
             <directory>./tests/</directory>

phpunit.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- 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="Flux test suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <coverage>
+        <include>
+            <directory>./src/</directory>
+        </include>
+    </coverage>
+</phpunit>