🔄 dotnet-test-rerun

Automatically rerun failed .NET tests until they pass

📖 Documentation • 🐛 Issues

---

🎯 Why dotnet-test-rerun?

Ever had tests fail intermittently due to network issues, timing problems, or external service hiccups? dotnet-test-rerun solves this by automatically rerunning failed tests, making your test suites more resilient and your CI/CD pipelines more reliable.

✨ Key Features

Feature	Description
🔄 Smart Retry	Automatically reruns only failed tests with configurable attempts
🎯 Selective Execution	Targets specific tests with filters instead of rerunning everything
📊 Multiple Loggers	Supports trx, junit, console, and custom test loggers
🐳 Docker Ready	Pre-built images for .NET 8.0, 9.0, and 10.0
⚙️ Highly Configurable	Extensive options for filtering, delays, and test execution
📈 Code Coverage	Collect and merge coverage reports across retry attempts
⚡ Performance First	Efficient execution by targeting only failed tests
🔧 CI/CD Optimized	Built-in support for GitHub Actions, Azure DevOps, GitLab CI

---

🚀 Quick Start

Installation

# Install as a global .NET tool
dotnet tool install --global dotnet-test-rerun

Basic Usage

# Run tests with automatic retry (default: 3 attempts)
test-rerun path/to/test.dll

# Customize retry attempts
test-rerun path/to/test.dll --rerunMaxAttempts 5

# Add delay between retries (useful for external dependencies)
test-rerun path/to/test.dll --rerunMaxAttempts 5 --delay 10

Docker Usage

# Use the latest stable version (.NET 10.0)
docker run joaoopereira/dotnet-test-rerun:latest path/to/test.dll --rerunMaxAttempts 3

# Or specify a .NET version
docker run joaoopereira/dotnet-test-rerun:4.0.0-net8 path/to/test.dll

---

📚 Common Use Cases

🌐 Integration Tests with External Services

test-rerun IntegrationTests.dll \
  --filter "Category=Integration" \
  --rerunMaxAttempts 5 \
  --delay 10 \
  --rerunMaxFailedTests 15

Perfect for tests that interact with databases, APIs, or microservices that may have transient failures.

🚀 CI/CD Pipeline Integration

# GitHub Actions example
- name: Run Tests with Retry
  run: |
    test-rerun tests/**/*.dll \
      --configuration Release \
      --rerunMaxAttempts 3 \
      --logger "trx;LogFileName=results.trx" \
      --results-directory ./TestResults

Make your CI/CD pipelines more resilient to intermittent failures.

📊 Code Coverage Collection

test-rerun MyTests.dll \
  --collect "XPlat Code Coverage" \
  --mergeCoverageFormat Cobertura \
  --rerunMaxAttempts 3

Collect and merge coverage reports even when tests need multiple attempts to pass.

🎭 UI/Selenium Tests

test-rerun UITests.dll \
  --filter "Category=UI" \
  --rerunMaxAttempts 10 \
  --delay 3 \
  --blame

Handle flaky UI tests with generous retry attempts and blame mode for debugging.

---

📦 Installation Options

Global Tool (Recommended) dotnet tool install --global dotnet-test-rerun test-rerun --help ✅ Available system-wide ✅ Easy to update ✅ Simple command

Docker docker pull joaoopereira/dotnet-test-rerun:latest docker run joaoopereira/dotnet-test-rerun:latest ✅ No installation needed ✅ Multiple .NET versions ✅ Isolated environment

Other options: Local Tool • NuGet Package

---

🎛️ Configuration Options

Core Options

Option	Default	Description
--rerunMaxAttempts	3	Maximum number of retry attempts
--rerunMaxFailedTests	-1	Maximum failed tests to rerun (no limit)
--delay, -d	-	Delay between retries in seconds
--filter	-	Run tests matching the expression
--deleteReports	false	Clean up report files after execution

Test Execution

Option	Description
--configuration, -c	Build configuration (Debug/Release)
--framework, -f	Target framework to test
--no-build	Skip building before testing
--blame	Enable blame mode for diagnostics
--collect	Enable data collectors (e.g., code coverage)

Logging & Output

Option	Default	Description
--logger, -l	trx	Test result logger (trx, junit, console)
--results-directory, -r	-	Output directory for test results
--loglevel	Verbose	Tool log level
--verbosity, -v	-	dotnet test verbosity level

📘 View All Options • Configuration Guide • Examples

---

🐳 Docker Images

Tag Pattern	.NET Runtime	Use Case
latest, {version}	.NET 10.0	Latest stable release
{version}-net10	.NET 10.0	Explicit .NET 10.0
{version}-net9	.NET 9.0	.NET 9.0 projects
{version}-net8	.NET 8.0	.NET 8.0 projects (LTS)

Example:

docker run joaoopereira/dotnet-test-rerun:4.0.0-net8 tests/MyTests.dll --rerunMaxAttempts 3

🐳 Docker Hub Repository • Docker Guide

---

🤝 Contributing

Contributions are welcome! We appreciate:

• 🐛 Bug reports and fixes
• ✨ New features and enhancements
• 📖 Documentation improvements
• 💡 Ideas and suggestions

Get Started:

1. Check the Contributing Guide
2. Browse Open Issues

---

👥 Community

Author

João Pereira
🌐 Website • 💼 GitHub

Contributors

Show Your Support

⭐ Star this project if it helped you!
🐦 Share with your network
💬 Discuss your use cases

---

📄 License

Copyright © 2023-2024 João Pereira

This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details.

---

⚠️ Language Support

Important: This tool currently supports English only. The output of dotnet test may be localized, and if it is not in English, the tool may not function correctly.

---

Made with ❤️ for the .NET community

Documentation • NuGet • Docker Hub