Created GenerateCharsetCommand

module/CLI/test/Command/Config/GenerateCharsetCommandTest.php

@@ -0,0 +1,56 @@
+<?php
+namespace ShlinkioTest\Shlink\CLI\Command\Config;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Shlinkio\Shlink\CLI\Command\Config\GenerateCharsetCommand;
+use Shlinkio\Shlink\Core\Service\UrlShortener;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Tester\CommandTester;
+use Zend\I18n\Translator\Translator;
+
+class GenerateCharsetCommandTest extends TestCase
+{
+    /**
+     * @var CommandTester
+     */
+    protected $commandTester;
+
+    public function setUp()
+    {
+        $command = new GenerateCharsetCommand(Translator::factory([]));
+        $app = new Application();
+        $app->add($command);
+
+        $this->commandTester = new CommandTester($command);
+    }
+
+    /**
+     * @test
+     */
+    public function charactersAreGeneratedFromDefault()
+    {
+        $prefix = 'Character set: ';
+        $prefixLength = strlen($prefix);
+
+        $this->commandTester->execute([
+            'command' => 'config:generate-charset',
+        ]);
+        $output = $this->commandTester->getDisplay();
+
+        // Both default character set and the new one should have the same length
+        $this->assertEquals($prefixLength + strlen(UrlShortener::DEFAULT_CHARS) + 1, strlen($output));
+
+        // Both default character set and the new one should have the same characters
+        $charset = substr($output, $prefixLength, strlen(UrlShortener::DEFAULT_CHARS));
+        $orderedDefault = $this->orderStringLetters(UrlShortener::DEFAULT_CHARS);
+        $orderedCharset = $this->orderStringLetters($charset);
+        $this->assertEquals($orderedDefault, $orderedCharset);
+    }
+
+    protected function orderStringLetters($string)
+    {
+        $letters = str_split($string);
+        sort($letters);
+        return implode('', $letters);
+    }
+}