Add new tests, remove redundant code

tests/SPC/store/CurlHookTest.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\Tests\store;
+
+use PHPUnit\Framework\TestCase;
+use SPC\store\CurlHook;
+
+/**
+ * @internal
+ */
+class CurlHookTest extends TestCase
+{
+    public function testSetupGithubToken()
+    {
+        $header = [];
+        CurlHook::setupGithubToken('GET', 'https://example.com', $header);
+        $this->assertEmpty($header);
+        putenv('GITHUB_TOKEN=token');
+        CurlHook::setupGithubToken('GET', 'https://example.com', $header);
+        $this->assertEquals(['Authorization: Bearer token'], $header);
+    }
+}