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