Add new metering tests to cover uncovered lines

[martintmk]

Details on the issue fix or feature implementation

Noticed this in #1144.

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[martincostello]

Would this maybe explain that random 99.75% coverage failure we get sometimes? Or is this something entirely new/different?

[codecov]

Codecov Report

Merging #1474 (9debfbf) into main (855ce01) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1474   +/-   ##
=======================================
  Coverage   83.88%   83.88%           
=======================================
  Files         275      275           
  Lines        6492     6492           
  Branches     1015     1015           
=======================================
  Hits         5446     5446           
  Misses        837      837           
  Partials      209      209           

Flag	Coverage Δ
linux	?
macos	83.88% <ø> (ø)
windows	?

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[martintmk]

Would this maybe explain that random 99.75% coverage failure we get sometimes? Or is this something entirely new/different?

It was revealed on .NET 8 so it's possible that this affected also .NET 7 and lower. Anyway let's see, this change can only help.