add usernamegenerator

tests/Util/UsernameGeneratorTest.php

@@ -0,0 +1,23 @@
+<?php namespace MapGuesser\Tests\Util;
+
+use MapGuesser\Util\UsernameGenerator;
+use PHPUnit\Framework\TestCase;
+
+final class UsernameGeneratorTest extends TestCase
+{
+    public function testCanGenerateRandomUsernameFromComponents(): void
+    {
+        $generator = new UsernameGenerator();
+        $parts = $this->getUsernameParts($generator->generate());
+
+        $this->assertEquals(3, count($parts));
+        $this->assertContains($parts[0], UsernameGenerator::ADJECTIVES);
+        $this->assertContains($parts[1], UsernameGenerator::ADJECTIVES);
+        $this->assertContains($parts[2], UsernameGenerator::NOUNS);
+    }
+
+    private function getUsernameParts(string $username): array
+    {
+        return explode('-', strtolower(preg_replace('/([a-z])([A-Z])/', '$1-$2', $username)));
+    }
+}