test failure with node v15.5.0

[elastic]

test failure with node v15.5.0

[trentm]

I can no longer reproduce this with the latest head (commit 0569bea):

% git log -1 | head -1
commit 0569beaa6b7c9cd83a05137e748ccb5f73fffee3 (HEAD -> master, origin/master, origin/HEAD)

% node --version
v15.5.0

% npm test
...
1..2427
# tests 2427
# pass  2427

# ok

----------------------------|----------|----------|----------|----------|-------------------|
File                        |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
----------------------------|----------|----------|----------|----------|-------------------|
All files                   |    94.48 |    90.31 |    89.42 |    94.64 |                   |
 apm-nodejs-http-client     |    93.81 |    87.85 |    92.21 |    94.02 |                   |
  index.js                  |    93.81 |    87.85 |    92.21 |    94.02 |... 1154,1197,1213 |
 apm-nodejs-http-client/lib |    96.88 |    96.24 |    81.48 |    96.77 |                   |
  container-info.js         |      100 |       80 |      100 |      100 |                16 |
  logging.js                |      100 |      100 |    28.57 |      100 |                   |
  ndjson.js                 |      100 |       50 |      100 |      100 |                 6 |
  truncate.js               |    96.53 |    97.62 |      100 |    96.43 |... 06,317,334,336 |
----------------------------|----------|----------|----------|----------|-------------------|

There were a lot of test changes made in #139 that I think may have been responsible for this being fixed now.

Since this issue was opened we've added testing of node v15 (I'll add node v16 as well). The tests pass with node v16.0.0 for me.