
PASS Passing nothing to Headers constructor
PASS Passing undefined to Headers constructor
PASS Passing null to Headers constructor
PASS Basic operation with one property
PASS Basic operation with one property and a proto
PASS Correct operation ordering with two properties
PASS Correct operation ordering with two properties one of which has an invalid name
PASS Correct operation ordering with two properties one of which has an invalid value
PASS Correct operation ordering with non-enumerable properties
PASS Correct operation ordering with undefined descriptors
PASS Correct operation ordering with repeated keys
PASS Basic operation with Symbol keys
PASS Operation with non-enumerable Symbol keys