998f1efbe9
This CL adds a test for what was fixed in
79cc54e519, namely that when loading a
concatenated component, the uriToSource map shouldn't have its values
overwritten with objects with no source in them.
Change-Id: Ief899295d0b4ab97cbfe598a39bb47441d38c3ba
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119542
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>