Improve Code Coverage

[TimothyMothra]

I want to improve code coverage in this repo.
My plan is to use this issue to link PRs and track overall progress.

CodeCoverage

Measured by CodeCov

Screenshot (2022-06-08)

FYI, these measurements will be heavily influenced by #3317, which is moving certain projects to the contrib repo.
I'm using the Progress below to track overall changes to code coverage.

Getting Started

As of today, 4 packages are below 80%

• OpenTelemetry.Instrumentation.AspNet.TelemetryHttpModule 50.37% This will be migrated to Contrib repo
• OpenTelemetry.Extensions.Hosting 75.00%
• OpenTelemetry.Exporter.InMemory 78.48%
• OpenTelemetry.Exporter.Prometheus 79.15%

My plan is to start with these.
As I find areas to improve, I'll search for similar areas in other packages.

Progress

• 2022-06-03: 85.44%
• 2022-06-06: 85.24%
• 2022-06-08: 85.8%
  • InMemoryExporter: 78.8%
    • improve test coverage: InMemoryExporter & IDeferredMeterProviderBuilder #3345
• 2022-06-10: 86.15%
  • InMemoryExporter: 89.87%
    • improve test coverage: InMemoryExporter SnapshotMetric #3344
• 2022-07-22: 86.11%
• 2022-08-03: 86.81%
• 2022-08-04: 87.08%

[github-actions]

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