Create InitialApiKeyCommand cli test

module/CLI/test-cli/Command/InitialApiKeyTest.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkioCliTest\Shlink\CLI\Command;
+
+use PHPUnit\Framework\Attributes\Test;
+use Shlinkio\Shlink\CLI\Command\Api\InitialApiKeyCommand;
+use Shlinkio\Shlink\TestUtils\CliTest\CliTestCase;
+
+class InitialApiKeyTest extends CliTestCase
+{
+    #[Test]
+    public function createsNoKeyWhenOtherApiKeysAlreadyExist(): void
+    {
+        [$output] = $this->exec([InitialApiKeyCommand::NAME, 'new_api_key', '-v']);
+
+        self::assertEquals(
+            <<<OUT
+            Other API keys already exist. Initial API key creation skipped.
+
+            OUT,
+            $output,
+        );
+    }
+}