diff --git a/tests/phpunit/tests/blocks/register.php b/tests/phpunit/tests/blocks/register.php
index 17bc36f50d..e1cd22db45 100644
--- a/tests/phpunit/tests/blocks/register.php
+++ b/tests/phpunit/tests/blocks/register.php
@@ -368,6 +368,58 @@ class Tests_Blocks_Register extends WP_UnitTestCase {
 		);
 	}
 
+	/**
+	 * Tests that register_block_style_handle() loads RTL stylesheets when an RTL locale is set.
+	 *
+	 * @ticket 56325
+	 * @ticket 56797
+	 *
+	 * @covers ::register_block_style_handle
+	 */
+	public function test_register_block_style_handle_should_load_rtl_stylesheets_for_rtl_text_direction() {
+		global $wp_locale;
+
+		$metadata = array(
+			'file'  => DIR_TESTDATA . '/blocks/notice/block.json',
+			'name'  => 'unit-tests/test-block-rtl',
+			'style' => 'file:./block.css',
+		);
+
+		$orig_text_dir             = $wp_locale->text_direction;
+		$wp_locale->text_direction = 'rtl';
+
+		$handle       = register_block_style_handle( $metadata, 'style' );
+		$extra_rtl    = wp_styles()->get_data( 'unit-tests-test-block-rtl-style', 'rtl' );
+		$extra_suffix = wp_styles()->get_data( 'unit-tests-test-block-rtl-style', 'suffix' );
+		$extra_path   = wp_normalize_path( wp_styles()->get_data( 'unit-tests-test-block-rtl-style', 'path' ) );
+
+		$wp_locale->text_direction = $orig_text_dir;
+
+		$this->assertSame(
+			'unit-tests-test-block-rtl-style',
+			$handle,
+			'The handle did not match the expected handle.'
+		);
+
+		$this->assertSame(
+			'replace',
+			$extra_rtl,
+			'The extra "rtl" data was not "replace".'
+		);
+
+		$this->assertSame(
+			'',
+			$extra_suffix,
+			'The extra "suffix" data was not an empty string.'
+		);
+
+		$this->assertSame(
+			wp_normalize_path( realpath( DIR_TESTDATA . '/blocks/notice/block-rtl.css' ) ),
+			$extra_path,
+			'The "path" did not match the expected path.'
+		);
+	}
+
 	/**
 	 * @ticket 56664
 	 */