tests: allow to mock final classes

Author: Alcides Ramos

app/Providers/Foo.php

@@ -8,9 +8,9 @@
 
 final class Foo
 {
-    public static function getDateTime(?string $format = 'Y-m-d H:i:s'): string
+    public static function getDateTime(?string $format): string
     {
-        return (new DateTimeImmutable())->format($format);
+        return (new DateTimeImmutable())->format($format ?? 'Y-m-d H:i:s');
     }
 
     public function ping(): string

tests/Unit/Providers/FooTest.php

@@ -5,6 +5,7 @@
 namespace UnitTests\Providers;
 
 use App\Providers\Foo;
+use DateTime;
 use DateTimeImmutable;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
@@ -17,7 +18,7 @@ final class FooTest extends TestCase
 {
     protected function setUp(): void
     {
-        ClockMock::freeze(new \DateTime('2024-01-01 00:00:00'));
+        ClockMock::freeze(new DateTime('2024-01-01 00:00:00'));
     }
 
     protected function tearDown(): void
@@ -29,20 +30,22 @@ protected function tearDown(): void
     #[DataProvider('dataProviderForGetDateTime')]
     public function checkGetDateTime(string $format): void
     {
-        $expectedCurrentDateTime = (new DateTimeImmutable())->format($format);
+        $datetime = new DateTimeImmutable();
 
-        self::assertEquals($expectedCurrentDateTime, Foo::getDateTime($format));
+        self::assertEquals($datetime->format($format), Foo::getDateTime($format));
     }
 
     /**
      * @return array<string, array<int, string>>
      */
     public static function dataProviderForGetDateTime(): array
     {
+        $datetime = new DateTimeImmutable();
+
         return [
-            '[CURRENT DATE TIME]' => ['Y-m-d H:i:s'],
-            '[CURRENT DATE]' => ['Y-m-d'],
-            '[CURRENT TIME]' => ['H:i:s'],
+            '[CURRENT DATE TIME]' => [$datetime->format('Y-m-d H:i:s')],
+            '[CURRENT DATE]' => [$datetime->format('Y-m-d')],
+            '[CURRENT TIME]' => [$datetime->format('H:i:s')],
         ];
     }