Downdgrade to phpuni 9 for coveralls

.gitignore

@@ -2,4 +2,5 @@ vendor
 composer.lock
 junit.xml
 build/
-.phpunit.cache/
+.phpunit.result.cache
+.phpunit.cache/

.travis.yml

@@ -4,10 +4,9 @@ php:
   - 7.3
   - 8.1
   - 8.2
-  - 8.3
 before_script:
-  - composer require php-coveralls/php-coveralls
+  - composer update
 script:
-  - vendor/bin/phpunit --coverage-clover build/coverage/clover.xml
+  - XDEBUG_MODE=coverage vendor/bin/phpunit --coverage-clover build/coverage/clover.xml
 after_script:
-  - php vendor/bin/coveralls -v
+  - php vendor/bin/php-coveralls -v

composer.json

@@ -12,12 +12,12 @@
         }
     ],
     "require": {
-        "php": ">=7.2.0",
+        "php": ">=7.3.0",
         "rmccue/requests": "^2.0"
     },
     "require-dev": {
-        "php": ">=7.2",
-        "phpunit/phpunit": "10.*"
+        "phpunit/phpunit": "9.*",
+        "php-coveralls/php-coveralls": "^2.7"
     },
     "autoload": {
         "files": [ "src/functions.php"],

phpunit.xml

@@ -1,14 +1,28 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="phpunit-bootstrap.php" colors="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd" cacheDirectory=".phpunit.cache">
-  <testsuites>
-    <testsuite name="All">
-      <directory>tests</directory>
-      <exclude>tests/unit/at/externet/eps_bank_transfer/BaseTest.php</exclude>
-    </testsuite>
-  </testsuites>
-  <source>
-    <include>
-      <directory suffix=".php">./src</directory>
-    </include>
-  </source>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         cacheResultFile=".phpunit.cache/test-results"
+         executionOrder="depends,defects"
+         forceCoversAnnotation="false"
+         beStrictAboutCoversAnnotation="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTodoAnnotatedTests="true"
+         convertDeprecationsToExceptions="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         verbose="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory>tests</directory>
+            <exclude>tests/unit/at/externet/eps_bank_transfer/BaseTest.php</exclude>
+        </testsuite>
+    </testsuites>
+
+    <coverage cacheDirectory=".phpunit.cache/code-coverage"
+              processUncoveredFiles="true">
+        <include>
+            <directory suffix=".php">src</directory>
+        </include>
+    </coverage>
 </phpunit>