Wraps assert functions, updating stack trace of generated errors

[jpbochi]

Should solve #317

The stack trace of assertion errors created by supertest doesn't refer back to the point where .expect(…) call was made. The trick done here saves the stack of when .expect(…) was called, and inserts that back into the .stack of any possible assertion Error created later.

Example:

I created a file name supertest-test.js with the following content:

const supertest = require('.');

supertest('https://httpbin.org')
  .get('/status/418')
  .expect(200)
  .end(function(err) {
    if (err) console.log(err);
  });

When running node ./supertest-test.js, this was the output:

expected 200 "OK", got 418 "I'm a Teapot"
    at Object.<anonymous> (/Users/jp/src/foss/supertest/supertest-test.js:5:4)
    at Module._compile (internal/modules/cjs/loader.js:999:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
    at Module.load (internal/modules/cjs/loader.js:863:32)
    at Function.Module._load (internal/modules/cjs/loader.js:708:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
    at internal/main/run_main_module.js:17:47
----
    at Test._assertStatus (/Users/jp/src/foss/supertest/lib/test.js:292:12)
    at /Users/jp/src/foss/supertest/lib/test.js:80:15
    at Test._assertFunction (/Users/jp/src/foss/supertest/lib/test.js:307:11)
    at Test.assert (/Users/jp/src/foss/supertest/lib/test.js:197:21)
    at localAssert (/Users/jp/src/foss/supertest/lib/test.js:155:12)
    at /Users/jp/src/foss/supertest/lib/test.js:152:5
    at Test.Request.callback (/Users/jp/src/foss/supertest/node_modules/superagent/lib/node/index.js:905:3)
    at IncomingMessage.<anonymous> (/Users/jp/src/foss/supertest/node_modules/superagent/lib/node/index.js:1127:20)
    at IncomingMessage.emit (events.js:326:22)
    at endReadableNT (_stream_readable.js:1241:12)

The content referred by …/supertest-test.js:5:4 is exactly the call to .expect(200).

[coveralls]

Pull Request Test Coverage Report for Build 470

• 12 of 12 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 97.447%

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Totals
Change from base Build 467:	0.1%
Covered Lines:	146
Relevant Lines:	150

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💛 - Coveralls

[chrisjmason]

👌

[jpbochi]

I'm so sorry to bother you, but I waited 6 weeks already. Can we get some love here, please? @rimiti

[niftylettuce]

v6.1.0 released to npm