re-introduce test using postgres dialect

Author: simonvandel

tests/sqlparser_common.rs

@@ -11125,8 +11125,15 @@ fn parse_trailing_comma() {
     );
     trailing_commas.verified_stmt(r#"SELECT "from" FROM "from""#);
 
-    // doesn't allow all trailing commas
-    let trailing_commas = TestedDialects::new(vec![Box::new(GenericDialect {})]);
+    // doesn't allow any trailing commas
+    let trailing_commas = TestedDialects::new(vec![Box::new(PostgreSqlDialect {})]);
+
+    assert_eq!(
+        trailing_commas
+            .parse_sql_statements("SELECT name, age, from employees;")
+            .unwrap_err(),
+        ParserError::ParserError("Expected an expression, found: from".to_string())
+    );
 
     assert_eq!(
         trailing_commas