Fix two-word tests precedence over one-word tests

CHANGELOG

@@ -1,5 +1,6 @@
 # 3.12.0 (2024-XX-XX)
 
+ * Fix precedence of two-word tests when the first word is a valid test
  * Deprecate the `spaceless` filter
  * Deprecate some internal methods from `Parser`: `getBlockStack()`, `hasBlock()`, `getBlock()`, `hasMacro()`, `hasTraits()`, `getParent()`
  * Deprecate passing `null` to `Twig\Parser::setParent()`

src/ExpressionParser.php

@@ -750,15 +750,15 @@ class ExpressionParser
         $stream = $this->parser->getStream();
         $name = $stream->expect(Token::NAME_TYPE)->getValue();
 
-        if (!$test = $this->env->getTest($name)) {
-            if ($stream->test(Token::NAME_TYPE)) {
-                // try 2-words tests
-                $name = $name.' '.$this->parser->getCurrentToken()->getValue();
+        if ($stream->test(Token::NAME_TYPE)) {
+            // try 2-words tests
+            $name = $name.' '.$this->parser->getCurrentToken()->getValue();
 
-                if ($test = $this->env->getTest($name)) {
-                    $stream->next();
-                }
+            if ($test = $this->env->getTest($name)) {
+                $stream->next();
             }
+        } else {
+            $test = $this->env->getTest($name);
         }
 
         if (!$test) {

tests/ExpressionParserTest.php

@@ -573,6 +573,17 @@ class ExpressionParserTest extends TestCase
         $this->doesNotPerformAssertions();
     }
 
+    public function testTwoWordTestPrecedence()
+    {
+        // a "empty element" test must have precedence over "empty"
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
+        $env->addTest(new TwigTest('empty element', 'foo'));
+        $parser = new Parser($env);
+
+        $parser->parse($env->tokenize(new Source('{{ 1 is empty element }}', 'index')));
+        $this->doesNotPerformAssertions();
+    }
+
     private function createNameExpression(string $name, array $attributes)
     {
         $expression = new NameExpression($name, 1);