Clean-up tests and use PHPStan max level for tests

tests/FunctionsTest.php

@@ -3,38 +3,42 @@
 namespace Ramsey\Uuid\Test;
 
 use Ramsey\Uuid\Uuid;
+use function Ramsey\Uuid\v1;
+use function Ramsey\Uuid\v3;
+use function Ramsey\Uuid\v4;
+use function Ramsey\Uuid\v5;
 
 class FunctionsTest extends TestCase
 {
-    public function testV1ReturnsVersion1UuidString()
+    public function testV1ReturnsVersion1UuidString(): void
     {
-        $v1 = \Ramsey\Uuid\v1();
+        $v1 = v1();
 
         $this->assertIsString($v1);
         $this->assertSame(Uuid::UUID_TYPE_TIME, Uuid::fromString($v1)->getVersion());
     }
 
-    public function testV3ReturnsVersion3UuidString()
+    public function testV3ReturnsVersion3UuidString(): void
     {
         $ns = Uuid::fromString(Uuid::NAMESPACE_URL);
-        $v3 = \Ramsey\Uuid\v3($ns, 'https://example.com/foo');
+        $v3 = v3($ns, 'https://example.com/foo');
 
         $this->assertIsString($v3);
         $this->assertSame(Uuid::UUID_TYPE_HASH_MD5, Uuid::fromString($v3)->getVersion());
     }
 
-    public function testV4ReturnsVersion4UuidString()
+    public function testV4ReturnsVersion4UuidString(): void
     {
-        $v4 = \Ramsey\Uuid\v4();
+        $v4 = v4();
 
         $this->assertIsString($v4);
         $this->assertSame(Uuid::UUID_TYPE_RANDOM, Uuid::fromString($v4)->getVersion());
     }
 
-    public function testV5ReturnsVersion5UuidString()
+    public function testV5ReturnsVersion5UuidString(): void
     {
         $ns = Uuid::fromString(Uuid::NAMESPACE_URL);
-        $v5 = \Ramsey\Uuid\v5($ns, 'https://example.com/foo');
+        $v5 = v5($ns, 'https://example.com/foo');
 
         $this->assertIsString($v5);
         $this->assertSame(Uuid::UUID_TYPE_HASH_SHA1, Uuid::fromString($v5)->getVersion());