fix: Improve test coverage for internal/wire folder.

[dpcollins-google]

No description provided.

[codecov]

Codecov Report

Merging #214 into master will increase coverage by 4.63%.
The diff coverage is 94.73%.

@@ Coverage Diff @@ ## master #214 +/- ## ============================================ + Coverage 63.14% 67.78% +4.63%  - Complexity 650 692 +42  ============================================ Files 134 134 Lines 3959 3970 +11 Branches 201 201 ============================================ + Hits 2500 2691 +191  + Misses 1348 1164 -184  - Partials 111 115 +4 

Impacted Files	Coverage Δ	Complexity Δ
...google/cloud/pubsublite/internal/ChannelCache.java	64.70% <80.00%> (+64.70%)	4.00 <1.00> (+4.00)
...internal/wire/SinglePartitionPublisherBuilder.java	100.00% <100.00%> (+100.00%)	2.00 <1.00> (+2.00)
...oogle/cloud/pubsublite/internal/wire/Versions.java	90.47% <100.00%> (+52.97%)	8.00 <7.00> (+4.00)
...cloud/pubsublite/internal/wire/SubscriberImpl.java	84.32% <0.00%> (+1.49%)	27.00% <0.00%> (+1.00%)
.../cloud/pubsublite/internal/wire/PublisherImpl.java	79.83% <0.00%> (+1.68%)	21.00% <0.00%> (+1.00%)
...google/cloud/pubsublite/internal/ProxyService.java	83.33% <0.00%> (+1.85%)	11.00% <0.00%> (ø%)
.../cloud/pubsublite/internal/wire/CommitterImpl.java	69.38% <0.00%> (+4.08%)	9.00% <0.00%> (+1.00%)
...sublite/internal/wire/ConnectedSubscriberImpl.java	90.32% <0.00%> (+22.58%)	18.00% <0.00%> (+4.00%)
... and 9 more

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