Add copy file endpoint code

[sathuhebbar]

Added file src/endpoints/file.copyFile.ts, modified src/app.ts:

1. Addresses Copy a file #26
2. Tests have not yet been implemented
3. Error messages and handling are still rudimentary, will work on them

[Xkonti]

Nice so far!

[sathuhebbar]

Added these changes, additionally modified src/constants/commonResponses.ts to add constants for the new error messages.
Please have a look.

[sathuhebbar]

Made the required modifications. Can you please tell me about this failing workflow test? I don't really understand what it means.

Thanks!

[Xkonti]

If you click on details next to the failed Test PR / check-pr (pull_request) workflow it will display the the log. There at the end you can see that all tests have passed. And right before that you have a table showing the test coverage:

---------------------------------------|---------|---------|-------------------

File	% Funcs	% Lines	Uncovered Line #s
All files	96.11	88.48
src/app.ts	100.00	100.00
src/constants/commonResponses.ts	100.00	100.00
src/endpoints/errors.ts	100.00	100.00
src/endpoints/file/checkFileExists.ts	100.00	92.00	29-30
src/endpoints/file/copyFile.ts	50.00 ⚠️	8.93 ⚠️	13-63
src/endpoints/file/getFile.ts	100.00	91.67	28-29
src/endpoints/file/getFileSize.ts	100.00	91.67	29-30
src/endpoints/file/uploadFile.ts	100.00	77.98	67,70-79,81-82,122,125-127,129-130,144,153-154,158
src/endpoints/guards.ts	100.00	100.00
src/endpoints/list/getList.ts	100.00	86.67	28,30-31
src/testing/constants.ts	100.00	100.00
src/testing/testFileSystem.ts	100.00	94.74	24-26
src/utils/config.ts	100.00	100.00
src/utils/directoryUtils.ts	100.00	95.06	23,71,88
src/utils/fileUtils.ts	80.00	53.97 ⚠️	55,63,80-106
src/utils/pathUtils.ts	100.00	100.00
src/utils/requestBuilder.ts	100.00	100.00
src/utils/urlBuilder.ts	100.00	100.00
---------------------------------------	---------	---------	-------------------

The project is configured to fail pull requests if any of the files' test coverage is below 70% of functions or lines:

file-api/bunfig.toml

Lines 1 to 3 in bd3b6fb

	[test]
	coverage = true
	coverageThreshold = 0.7

In the table I highlighted both copyFile.ts and fileUtils.ts that don't have enough test coverage.

You can look at uploadFile.ts and getFile.ts endpoints to see how they are tested (different edge cases etc) and then how other methods if fileUtils.ts are tested.