| PASS Create headers from no parameter | |
| PASS Create headers from undefined parameter | |
| PASS Create headers from empty object | |
| PASS Create headers with null should throw | |
| PASS Create headers with 1 should throw | |
| PASS Create headers with sequence | |
| PASS Create headers with record | |
| PASS Create headers with existing headers | |
| PASS Create headers with existing headers with custom iterator | |
| PASS Check append method | |
| PASS Check set method | |
| PASS Check has method | |
| PASS Check delete method | |
| PASS Check get method | |
| PASS Check keys method | |
| PASS Check values method | |
| PASS Check entries method | |
| PASS Check Symbol.iterator method | |
| PASS Check forEach method | |