More tests

tests/TeamsTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace DNW\Skills\Tests;
+
+use DNW\Skills\Teams;
+use DNW\Skills\Team;
+use DNW\Skills\RatingContainer;
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\UsesClass;
+
+#[CoversClass(Teams::class)]
+#[UsesClass(Team::class)]
+#[UsesClass(RatingContainer::class)]
+class TeamsTest extends TestCase
+{
+    public function testTeamsConcat(): void
+    {
+        $t1 = new Team();
+        $t2 = new Team();
+        $t3 = new Team();
+
+        $this->assertEquals([$t1], Teams::concat($t1));
+        $this->assertEquals([$t1, $t2, $t3], Teams::concat($t1, $t2, $t3));
+    }
+}