Add even more tests

tests/LexerTest.php

@@ -653,4 +653,25 @@ bar
         yield ['{{ ({ a: 1) }}', '{'];
         yield ['{{ (([1]) + 3 }}', '('];
     }
+
+    /**
+     * @dataProvider getTemplateForUnexpectedBracketInExpression
+     */
+    public function testUnexpectedBracketInExpression(string $template, string $bracket)
+    {
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
+
+        $this->expectException(SyntaxError::class);
+        $this->expectExceptionMessage(\sprintf('Unexpected "%s" in "index" at line 1.', $bracket));
+
+        $lexer->tokenize(new Source($template, 'index'));
+    }
+
+    public static function getTemplateForUnexpectedBracketInExpression()
+    {
+        yield ['{{ 1 + 3) }}', ')'];
+        yield ['{{ obj] }}', ']'];
+        yield ['{{ { a: 1 }}', '}'];
+        yield ['{{ ([1] + 3)) }}', ')'];
+    }
 }