Fetch Test Coverage

[ronag]

Current test coverage on fetch is too low for a stable release.

Please refer lib/fetch folder on CodeCov to check which components of fetch implementation lack unit tests. Comment on this issue on which component you would like to add test and post a PR!

Please refer CONTRIBUTING.md on how to run tests.

[teezzan]

@ronag, I would love to work on this. However, I am a little new to this. Can you give me more information about the issue and a little bit of direction?

[ronag]

Run ’npm run coverage’ see what parts of the code lacks test and make one in the test folder.

[trivikr]

Run ’npm run coverage’ see what parts of the code lacks test and make one in the test folder.

I landed on this issue after reading about lack of test coverage in https://github.com/nodejs/node/pull/41749#issuecomment-1024970687

Assuming this is a tracking issue to improve test coverage, would it be helpful to provide detailed instructions on how folks can help in the issue description? cc @ronag

Also, it would be helpful if a link to this issue is provided in README at https://github.com/nodejs/undici#undicifetchinput-init-promise

[mcollina]

Could you propose some text?

[trivikr]

Could you propose some text?

How about this for issue description?

---

Please refer lib/fetch folder on CodeCov to check which components of fetch implementation lack unit tests. Comment on this issue on which component you would like to add test and post a PR!

Please refer CONTRIBUTING.md on how to run tests.

---

I've posted the following PRs to improve discoverability/documentation:

• https://github.com/nodejs/undici/pull/1191
• https://github.com/nodejs/undici/pull/1192

[mcollina]

Done!

[RaisinTen]

Sent https://github.com/nodejs/undici/pull/1206 to complete the coverage of the File class in its current state.

[artrixdotdev]

any updates on this becoming stable?

[ronag]

@KhafraDev, any idea on the coverage stats from wpt?

[KhafraDev]

I couldn't get any tools to work with it, but it's likely pretty high with the current test coverage.

edit: I actually got c8 to work, but I'm unsure if it takes coverage from all 4 wpt suites. I'll need to configure it some more and do some testing.

[ronag]

Would be great if we could show off your hard work with numbers! If nothing else to bring trust and confidence to our users.

[KhafraDev]

[fetch]: Completed: 1307, failed: 137, success: 1170, expected failures: 137, unexpected failures: 0
[FileAPI]: Completed: 234, failed: 19, success: 215, expected failures: 19, unexpected failures: 0
[mimesniff]: Completed: 1898, failed: 1008, success: 890, expected failures: 1008, unexpected failures: 0
[xhr]: Completed: 36, failed: 0, success: 36, expected failures: 0, unexpected failures: 0
--------------|---------|----------|---------|---------|------------------------------------------------------------------------------------------------
File          | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
--------------|---------|----------|---------|---------|------------------------------------------------------------------------------------------------
All files     |   87.18 |    84.11 |   90.43 |   87.18 |                                                                                                
 body.js      |   91.87 |    92.56 |     100 |   91.87 | 70-71,242-247,279,288-289,352-354,360-385,409-413,417-420,425-426                              
 constants.js |   79.46 |    33.33 |       0 |   79.46 | 67-74,81-95                                                                                    
 dataURL.js   |   94.88 |    91.39 |      90 |   94.88 | 124-135,161-162,170-171,176-177,241-243,292-293,327-328,372-373,548-551                        
 file.js      |   68.95 |    92.68 |   47.36 |   68.95 | ...153,156-161,164-169,172-177,180-185,188-193,196-201,204-209,212-217,220-221,303-304,337-350 
 formdata.js  |   77.84 |    71.64 |    92.3 |   77.84 | ...-94,112-113,116-119,134-135,138-141,152-153,156-159,162-165,205-206,217-218,229-230,244-263 
 global.js    |   72.91 |    42.85 |     100 |   72.91 | 17-18,21-29,34-35                                                                              
 headers.js   |   93.09 |     89.9 |     100 |   93.09 | 59-64,199-203,266,268-269,366-371,383,403-404,415-416,427-428,443-444,464-469                  
 index.js     |   87.79 |    77.74 |   89.36 |   87.79 | ...0-1731,1745-1750,1798-1799,1838-1839,1844-1845,1878-1880,1945,1954-1955,1988-1994,2012-2013 
 request.js   |    93.4 |    90.62 |     100 |    93.4 | ...218,229-239,245-251,258-261,282-288,294-297,312-315,371-374,485-488,585-586,593-595,842-843 
 response.js  |   93.36 |    95.45 |      96 |   93.36 | 53-56,419-428,442-455,459-468,574-575                                                          
 symbols.js   |     100 |      100 |     100 |     100 |                                                                                                
 util.js      |   78.93 |    72.84 |    87.5 |   78.93 | ...462,465-504,517-518,525-526,530-531,592-597,611-612,715-718,837-840,850-851,854-856,868-869 
 webidl.js    |   82.32 |       80 |     100 |   82.32 | ...236,258-262,317-321,355-361,413-414,512-517,524-528,552-557,564-568,585-589,596-600,626-627 
--------------|---------|----------|---------|---------|------------------------------------------------------------------------------------------------

ran with c8 --include=lib/fetch npm run test:wpt

current code cov for lib/fetch: ~92% wpt code cov: 87.2%

if we can update codecov to combine all coverage files we'll likely see some increase?