try realpath to see if it helps

Author: swissspidy

tests/tests/TestBehatTags.php

@@ -177,7 +177,7 @@ public function test_behat_tags_extension(): void {
 
 		putenv( 'GITHUB_TOKEN' );
 
-		$behat_tags = dirname( dirname( __DIR__ ) ) . '/utils/behat-tags.php';
+		$behat_tags = realpath( dirname( dirname( __DIR__ ) ) . '/utils/behat-tags.php' );
 
 		file_put_contents( $this->temp_dir . '/features/extension.feature', '@require-extension-imagick @require-extension-curl' );
 
@@ -217,7 +217,7 @@ public function test_behat_tags_extension(): void {
 	public function test_behat_tags_db_version(): void {
 		$db_type = getenv( 'WP_CLI_TEST_DBTYPE' );
 
-		$behat_tags = dirname( dirname( __DIR__ ) ) . '/utils/behat-tags.php';
+		$behat_tags = realpath( dirname( dirname( __DIR__ ) ) . '/utils/behat-tags.php' );
 
 		// Just to get the get_db_version() function.
 		ob_start();