minor symfony#61796 [Form] prefer the public API over reflection in test (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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[Form] prefer the public API over reflection in test

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

I missed this in symfony#60975

Commits
-------

baaa7d0 prefer the public API over reflection in test

Author: GromNaN

src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php

@@ -732,7 +732,7 @@ public function testReverseTransformDoesNotCauseIntegerPrecisionLoss()
             $this->markTestSkipped('Test is not applicable on 32-bit systems where no integer loses precision when cast to float.');
         }
 
-        $transformer = new NumberToLocalizedStringTransformer();
+        $transformer = new NumberToLocalizedStringTransformer(2);
 
         // Test a large integer that causes actual precision loss when cast to float
         $largeInt = \PHP_INT_MAX - 1; // This value loses precision when cast to float
@@ -741,24 +741,4 @@ public function testReverseTransformDoesNotCauseIntegerPrecisionLoss()
         $this->assertSame($largeInt, $result);
         $this->assertIsInt($result);
     }
-
-    public function testRoundMethodKeepsIntegersAsIntegers()
-    {
-        if (\PHP_INT_SIZE === 4) {
-            $this->markTestSkipped('Test is not applicable on 32-bit systems where no integer loses precision when cast to float.');
-        }
-
-        $transformer = new NumberToLocalizedStringTransformer(2); // scale=2 triggers rounding
-
-        // Use reflection to test the private round() method directly
-        $reflection = new \ReflectionClass($transformer);
-        $roundMethod = $reflection->getMethod('round');
-
-        $int = \PHP_INT_MAX - 1;
-        $result = $roundMethod->invoke($transformer, $int);
-
-        // With the fix, integers should stay as integers, not be converted to floats
-        $this->assertSame($int, $result);
-        $this->assertIsInt($result);
-    }
 }