Add test

Author: sebastianbergmann

tests/end-to-end/migration/migration-from-85.phpt

@@ -0,0 +1,20 @@
+--TEST--
+Configuration migration from PHPUnit 8.5 format works
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][1] = '--migrate-configuration';
+
+chdir(sys_get_temp_dir());
+copy(__DIR__ . '/migration-from-85/phpunit-8.5.xml', 'phpunit.xml');
+
+require __DIR__ . '/../../bootstrap.php';
+
+PHPUnit\TextUI\Command::main(false);
+
+print file_get_contents(sys_get_temp_dir() . '/phpunit.xml');
+print file_get_contents(sys_get_temp_dir() . '/phpunit.xml.bak');
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Created backup:         %sphpunit.xml.bak
+Migrated configuration: %sphpunit.xml

tests/end-to-end/migration/migration-from-85/phpunit-8.5.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/8.5/phpunit.xsd"
+         bootstrap="src/Greeter.php"
+         executionOrder="depends,defects"
+         forceCoversAnnotation="true"
+         beStrictAboutCoversAnnotation="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutTodoAnnotatedTests="true"
+         verbose="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory suffix="Test.php">tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
+</phpunit>