Add Global Command tests

tests/Composer/Test/Command/GlobalCommandTest.php

@@ -0,0 +1,39 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Test\Command;
+
+use Composer\Test\TestCase;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Symfony\Component\Console\Exception\RuntimeException;
+
+class GlobalCommandTest extends TestCase
+{
+    public function testExceptionRunningWithNoSubcommand(): void
+    {
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('Not enough arguments (missing: "command-name").');
+
+        $appTester = $this->getApplicationTester();
+        $this->assertEquals(Command::FAILURE, $appTester->run(['command' => 'global']));
+    }
+
+    public function testExceptionRunningWithIncompleteSubcommand(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Not enough arguments (missing: "packages").');
+
+        $appTester = $this->getApplicationTester();
+        $this->assertEquals(Command::FAILURE, $appTester->run(['command' => 'global', 'command-name' => 'remove'] ));
+    }
+}