
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