Add test for empty test suite

Author: sebastianbergmann

tests/end-to-end/execution-order/empty-test-suite.phpt

@@ -0,0 +1,24 @@
+--TEST--
+Empty test suite
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--debug';
+$_SERVER['argv'][] = __DIR__ . '/fixture/empty-test-suite';
+
+require __DIR__ . '/../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit Started (PHPUnit %s using %s)
+Test Runner Configured
+Test Runner Triggered Warning (No tests found in class "PHPUnit\TestFixture\ExecutionOrder\EmptyTestSuite\FooTest".)
+Test Suite Loaded (0 tests)
+Event Facade Sealed
+Test Runner Started
+Test Suite Sorted
+Test Runner Execution Started (0 tests)
+Test Runner Execution Finished
+Test Runner Finished
+PHPUnit Finished (Shell Exit Code: 1)

tests/end-to-end/execution-order/fixture/empty-test-suite/FooTest.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PHPUnit\TestFixture\ExecutionOrder\EmptyTestSuite;
+
+use PHPUnit\Framework\TestCase;
+
+final class FooTest extends TestCase
+{
+}