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Add Test Coverage Stats With Jest as a javascript til

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2018-03-30 16:55:09 -05:00
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# Test Coverage Stats With Jest
Jest is a delightful tool for JavaScript testing from Facebook. As your
project evolves and you add tests (or perhaps choose to not add tests) you
may wonder what kind of test coverage you have. What is the overall
coverage? Which files are well covered and which are seriously lacking?
Use the `--coverage` flag to get this information.
```bash
$ jest --coverage
```
After running all of your tests a table will be output to the terminal with
a list of files and their respective coverage percentages in terms of
statement, branch, function, and line coverage.
```
---------------------------|----------|----------|----------|----------|----------------|
File | % Stmts | % Branch | % Funcs | % Lines |Uncovered Lines |
---------------------------|----------|----------|----------|----------|----------------|
```
This can help guide you to what parts of your app may need more testing.