Istanbul
Istanbul is an open-source JavaScript test coverage tool. It monitors JavaScript code execution to generate comprehensive code coverage statistics, helping developers identify untested parts of an application. Istanbul integrates with common testing frameworks like Mocha, Jasmine
test-coverage
javascript
open-source
Istanbul: Open-Source JS Test Coverage Tool
An open-source JavaScript test coverage tool monitoring code execution for comprehensive statistics, identifying untested parts of applications, integrated with Mocha, Jasmine and Jest.
What is Istanbul?
Istanbul is an open source tool for measuring JavaScript and Node.js test coverage. It provides metrics showing which parts of code are executed and which are not during test runs, measured in percentages of statements, branches, functions and lines.
Some key features of Istanbul include:
- Integration with test runners like Mocha, Jasmine and Jest
- Coverage summary reports in text, HTML and LCOV formats
- Command line, in-process and remote interfaces to capture coverage
- Highlighting of covered and uncovered code directly on source files
- Threshold enforcement to fail builds when coverage is under target
- Ignoring coverage of files, branches or lines using comments
By providing detailed visibility into test suite coverage, Istanbul helps developers write better tests and ensure most code paths are exercised by tests. This improves code quality and reduces defects. Integration into CI workflows can enforce minimum coverage standards.
Overall, Istanbul is a useful open source tool for JavaScript developers to accurately measure and improve their test coverage during development and continuous integration.
Istanbul Features
Features
- Code coverage reporting
- Statement, branch, and function coverage
- Integration with testing frameworks
- Command line interface
- Configurable reporting
- Source map support
Pricing
- Open Source
Pros
Open source and free
Detailed and customizable reports
Language-agnostic
Wide compatibility with testing frameworks
Active community support
Cons
Setup can be complex
Reports can be overwhelming for large codebases
Limited debugging capabilities
May require config tweaks for some frameworks
Official Links
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