Daily Test Coverage Improver: Add tests for AsyncSeqExtensions and Seq modules

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Summary

• Added 6 comprehensive tests covering previously untested AsyncSeqExtensions and Seq modules
• Achieved 100% coverage for both AsyncSeqExtensions and Seq modules (up from 0%)
• Test count increased from 128 → 134 tests
• All tests pass successfully

Problems Found

• AsyncSeqExtensions module: Had 0% coverage despite being a critical module that extends async computation builder with AsyncSeq support
• Seq module: Had 0% coverage for the ofAsyncSeq utility function

Actions Taken

AsyncSeqExtensions Tests (3 tests):

• async.For with AsyncSeq - Tests basic iteration over AsyncSeq within async computation
• async.For with empty AsyncSeq - Tests edge case with empty sequences
• async.For with exception in AsyncSeq - Tests exception propagation through async.For

Seq Module Tests (3 tests):

• Seq.ofAsyncSeq should work - Tests conversion of AsyncSeq to blocking sequence
• Seq.ofAsyncSeq with empty AsyncSeq - Tests edge case with empty sequences
• Seq.ofAsyncSeq with exception - Tests exception handling during conversion

Changes in Test Coverage Achieved

Before:

• Line Coverage: 86.0% (1,045/1,215 lines)
• Method Coverage: 87.7% (535/610 methods)
• AsyncSeqExtensions: 0% coverage
• Seq: 0% coverage

After:

• Line Coverage: 86.1% (1,047/1,215 lines) - +2 lines
• Method Coverage: 88.0% (537/610 methods) - +2 methods
• AsyncSeqExtensions: 100% coverage ✅
• Seq: 100% coverage ✅

Other Areas for Future Improvement

Based on coverage analysis, remaining improvement opportunities:

• AsyncSeqOp<T>: 33.3% coverage (2 uncovered methods)
• Utils module: 79.6% coverage (12 uncovered lines)
• Main AsyncSeq module: Still has 65 uncovered branches for edge cases

Commands to validate coverage numbers:

dotnet test --collect:"XPlat Code Coverage" --results-directory ./coverage
reportgenerator -reports:"coverage/**/coverage.cobertura.xml" -targetdir:"coverage/report" -reporttypes:"JsonSummary"
cat coverage/report/Summary.json

Bash commands executed

• git checkout -b feature/test-coverage-improvements-extensions-seq
• dotnet build --no-restore
• dotnet test --collect:"XPlat Code Coverage" --results-directory ./coverage-new
• reportgenerator -reports:"coverage-new/**/coverage.cobertura.xml" -targetdir:"coverage-new/report" -reporttypes:"JsonSummary"
• git add tests/FSharp.Control.AsyncSeq.Tests/AsyncSeqTests.fs tests/FSharp.Control.AsyncSeq.Tests/FSharp.Control.AsyncSeq.Tests.fsproj
• git commit -m "..."
• git push -u origin feature/test-coverage-improvements-extensions-seq

Web searches performed

None - worked with existing codebase analysis.

Web pages fetched

None - worked with existing codebase analysis.

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