mock: unify expected span checking #3096
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Previously there were two separate implementations which would check an `ExpectedSpan` against and actual span. One on the `ExpectedSpan` struct itself, which took a `SpanState` as used by the `MockCollector` and another on the `MockSubscriber` which took a `SpanRef` (from `tracing-subscriber`). In reality, both of these checks needed a `span::Id` and a `Metadata` to check, but the structure was also somewhat different, with the `MockSubscriber` span check giving better error output. This change combines the two checks into the one on `ExpectedSpan`, which is now generic over an `ActualSpan` implementation, which has been provided for `SpanState`, `SpanRef`, and also `span::Id` (for the case where no `Metadata` is available). The better error output from `MockSubscriber` has been integrated into that check.
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This change has been merged into #3098 and modified significantly. |
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Motivation
Previously there were two separate implementations which would check an
ExpectedSpanagainst and actual span. One on theExpectedSpanstructitself, which took a
SpanStateas used by theMockCollectorandanother on the
MockSubscriberwhich took aSpanRef(fromtracing-subscriber).In reality, both of these checks needed a
span::Idand aMetadatatocheck, but the structure was also somewhat different, with the
MockSubscriberspan check giving better error output.Solution
This change combines the two checks into the one on
ExpectedSpan,which is now generic over an
ActualSpanimplementation, which has beenprovided for
SpanState,SpanRef, and alsospan::Id(for the casewhere no
Metadatais available).The better error output from
MockSubscriberhas been integrated intothat check.