Add console test

tests/integration/console/AbstractCommandTest.php

@@ -0,0 +1,57 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Tests\integration\console;
+
+use Flarum\Console\AbstractCommand;
+use Flarum\Extend;
+use Flarum\Locale\Translator;
+use Flarum\Testing\integration\ConsoleTestCase;
+
+class AbstractCommandTest extends ConsoleTestCase
+{
+    /**
+     * @test
+     */
+    public function scheduled_command_exists_when_added()
+    {
+        $this->extend(
+            (new Extend\Console())
+                ->command(CustomEchoTranslationsCommand::class)
+        );
+
+        $input = [
+            'command' => 'customEchoTranslationsCommand'
+        ];
+
+        // Arbitrary translation
+        $this->assertEquals('Flarum Email Test', $this->runCommand($input));
+    }
+}
+
+class CustomEchoTranslationsCommand extends AbstractCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this->setName('customEchoTranslationsCommand');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function fire()
+    {
+        $translator = resolve(Translator::class);
+
+        $this->info($translator->trans('core.emails.send_test.subject'));
+    }
+}