wp_normalize_path split test fix

tests-functions.php

    /** 
     * Tests that wp_normalize_path() static cache stores results.
     *
     * Uses ReflectionFunction::getStaticVariables() to inspect the cache.
     *  
     * Skipped on PHP 8.1 and 8.2 because OPcache's Dead Code Elimination
     * incorrectly treats ZEND_BIND_STATIC as side-effect-free for static
     * variables with simple initializers, causing getStaticVariables() to
     * return compile-time defaults instead of runtime values. Fixed in
     * PHP 8.3 via PR #9301 (arbitrary static variable initializers RFC).
     *      
     * @ticket 64538
     */ 
    public function test_wp_normalize_path_static_cache() {
        if ( version_compare( PHP_VERSION, '8.1.0', '>=' ) && version_compare( PHP_VERSION, '8.3.0', '<' ) ) {
            $this->markTestSkipped( 'ReflectionFunction::getStaticVariables() returns stale values on PHP 8.1/8.2 with OPcache (fixed in 8.3).' );
        }   
        
        $path     = '/var/www/cache-test\\subdir\\';
        $expected = '/var/www/cache-test/subdir/';
    
        $result = wp_normalize_path( $path );
        $this->assertSame( $expected, $result );
        
        $reflection  = new ReflectionFunction( 'wp_normalize_path' );
        $static_vars = $reflection->getStaticVariables();
        
        $this->assertArrayHasKey( 'cache', $static_vars, 'Static cache array should exist.' );
        $this->assertArrayHasKey( $path, $static_vars['cache'], 'Cache should contain the normalized path.' );
        $this->assertSame( $expected, $static_vars['cache'][ $path ], 'Cached value should match the expected normalized path.' );
    }

    /**
     * Tests that wp_normalize_path() static cache stores results on PHP 8.1/8.2.
     *
     * On these versions ReflectionFunction::getStaticVariables() is unreliable
     * due to an OPcache DCE bug, so we verify caching behavior indirectly by
     * confirming repeated calls return identical results.
     *
     * @ticket 64538
     */
    public function test_wp_normalize_path_static_cache_php81_82() {
        if ( version_compare( PHP_VERSION, '8.1.0', '<' ) || version_compare( PHP_VERSION, '8.3.0', '>=' ) ) {
            $this->markTestSkipped( 'This test targets the PHP 8.1/8.2 OPcache bug. Other versions use test_wp_normalize_path_static_cache().' );
        }

        $path     = '/var/www/cache-test\\subdir\\';
        $expected = '/var/www/cache-test/subdir/';

        $first_call  = wp_normalize_path( $path );
        $second_call = wp_normalize_path( $path );

        $this->assertSame( $expected, $first_call, 'First call should return the normalized path.' );
        $this->assertSame( $first_call, $second_call, 'Second call should return the same cached result.' );
    }