.NET

What is planned

When the built-in .NET runner ships, it will:

Accept lang: dotnet in nolapse.yaml.
Invoke dotnet test --collect:"XPlat Code Coverage" automatically.
Parse the Cobertura XML report produced by Coverlet to extract line coverage.
Respect the same warn_threshold / fail_threshold / strict_mode settings as all other runners.

The expected nolapse.yaml when it is available:

lang: dotnet
warn_threshold: -1.0
fail_threshold: -5.0
strict_mode: false

Workaround: custom runner (Coverlet)

Until the built-in runner ships you can invoke dotnet test with Coverlet and parse the resulting JSON summary.

1. Add Coverlet to your test project

dotnet add package coverlet.collector

Or for MSBuild integration:

dotnet add package coverlet.msbuild

2. Write a custom runner script

Create nolapse-runner.sh at the repo root:

#!/usr/bin/env bash
set -euo pipefail

REPO_PATH="${1:-.}"
cd "$REPO_PATH"

# Run tests and produce a JSON summary via coverlet
dotnet test --collect:"XPlat Code Coverage" \
  -- DataCollectionRunSettings.DataCollectors.DataCollector.Configuration.Format=json \
     DataCollectionRunSettings.DataCollectors.DataCollector.Configuration.OutputFormat=json

# Find the most recently written coverage.json
COVERAGE_FILE=$(find . -name "coverage.json" -newer nolapse.yaml 2>/dev/null | head -1)

if [ -z "$COVERAGE_FILE" ]; then
  echo "nolapse-runner: coverage.json not found" >&2
  exit 1
fi

PCT=$(python3 -c "
import json, sys
data = json.load(open('$COVERAGE_FILE'))
lines_covered = sum(v.get('Summary', {}).get('LinesCovered', 0) for v in data.values())
lines_total   = sum(v.get('Summary', {}).get('LinesTotal', 0)   for v in data.values())
print(f'{(lines_covered / lines_total * 100):.1f}' if lines_total else '0.0')
")

echo "nolapse-coverage: ${PCT}"

Make it executable:

chmod +x nolapse-runner.sh

3. Configure nolapse

lang: custom
warn_threshold: -1.0
fail_threshold: -5.0

Run nolapse:

NOLAPSE_RUNNER_PATH=./nolapse-runner.sh nolapse run --repo .

See Custom Runner for the full runner contract.

Track the roadmap

Watch the nolapse changelog and the .NET runner issue for updates.