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okay, let's dive deep into angular testing with a focus on generating code coverage reports. this tutorial will guide you through setting up your angular project for coverage reporting, running tests with coverage, interpreting the results, and using those results to improve your test suite and codebase.

*table of contents*

1. *introduction to code coverage*
what is code coverage?
why is code coverage important?
coverage metrics
2. *setting up your angular project for coverage*
dependencies & configuration (karma, istanbul, etc.)
`angular.json` configuration
`tsconfig.spec.json`
3. *writing tests for coverage*
general test writing principles
targeting specific code paths
testing edge cases and error handling
4. *running tests with coverage*
`ng test --code-coverage`
5. *interpreting the code coverage report*
understanding the report structure
analyzing coverage gaps
identifying untested code
6. *improving code coverage*
writing missing tests
refactoring for testability
dealing with difficult-to-test code
7. *ignoring code in coverage reports*
`/* istanbul ignore next */`
ignoring files/folders in `angular.json`
8. *continuous integration (ci) integration*
setting up coverage thresholds
failing builds on low coverage
9. *advanced coverage techniques*
mutation testing (brief overview)
10. *complete code example*
sample angular service and component
test cases for high coverage
11. *common issues and troubleshooting*
12. *conclusion*

*1. introduction to code coverage*

*what is code coverage?*

code coverage is a metric that measures the extent to which the source code of a program has been tested. it aims to identify areas of code that haven't been exercised by any tests. it doesn't guarantee correctness but can highlight potential vulne ...

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