tree dd4f7fff3442f9634d2f477ae8e4c0fc62c1d30a
parent fdf8c0d4ee658d0973d258436cb16308fb05faad
author Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com> 1665756632 +0200
committer GitHub <noreply@github.com> 1665756632 +0200
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Fetch, Web IDL: test that Headers iteration happens on live value pairs

Add some tests to verify the pair iterator behavior specified in Web IDL,
namely that the value pairs to be iterated over are retrieved on every
invocation of the iterator prototype object's `next()` function.

In practice, this means that every iteration step needs to be performed on a
Headers' sorted-and-combined headers list that should not be cached. Gecko
seems to be the only engine doing this right, as both WebKit and Blink
appear to carry out the entire iteration on a cached copy of the header
list.

The tests were based on the ones in
webidl/ecmascript-binding/iterator-invalidation-foreach.html.