Add tests

Author: sebastianbergmann

tests/unit/Util/Xml/SchemaFinderTest.php

@@ -0,0 +1,33 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PHPUnit\Util\Xml;
+
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Runner\Version;
+
+/**
+ * @small
+ *
+ * @covers \PHPUnit\Util\Xml\SchemaFinder
+ */
+final class SchemaFinderTest extends TestCase
+{
+    public function testFindsExistingSchemaForComposerInstallation(): void
+    {
+        $this->assertFileExists((new SchemaFinder)->find((new Version)->series()));
+    }
+
+    public function testDoesNotFindNonExistentSchemaForComposerInstallation(): void
+    {
+        $this->expectException(Exception::class);
+
+        (new SchemaFinder)->find('0.0');
+    }
+}