Created command to generate a new api key

module/CLI/test/Command/Api/GenerateKeyCommandTest.php

@@ -0,0 +1,55 @@
+<?php
+namespace ShlinkioTest\Shlink\CLI\Command\Api;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Prophecy\Argument;
+use Prophecy\Prophecy\ObjectProphecy;
+use Shlinkio\Shlink\CLI\Command\Api\GenerateKeyCommand;
+use Shlinkio\Shlink\Rest\Service\ApiKeyService;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Tester\CommandTester;
+use Zend\I18n\Translator\Translator;
+
+class GenerateKeyCommandTest extends TestCase
+{
+    /**
+     * @var CommandTester
+     */
+    protected $commandTester;
+    /**
+     * @var ObjectProphecy
+     */
+    protected $apiKeyService;
+
+    public function setUp()
+    {
+        $this->apiKeyService = $this->prophesize(ApiKeyService::class);
+        $command = new GenerateKeyCommand($this->apiKeyService->reveal(), Translator::factory([]));
+        $app = new Application();
+        $app->add($command);
+        $this->commandTester = new CommandTester($command);
+    }
+
+    /**
+     * @test
+     */
+    public function noExpirationDateIsDefinedIfNotProvided()
+    {
+        $this->apiKeyService->create(null)->shouldBeCalledTimes(1);
+        $this->commandTester->execute([
+            'command' => 'api-key:generate',
+        ]);
+    }
+
+    /**
+     * @test
+     */
+    public function expirationDateIsDefinedIfWhenProvided()
+    {
+        $this->apiKeyService->create(Argument::type(\DateTime::class))->shouldBeCalledTimes(1);
+        $this->commandTester->execute([
+            'command' => 'api-key:generate',
+            '--expirationDate' => '2016-01-01',
+        ]);
+    }
+}