Attempt to add code coverage

[joshsmith]

What's in this PR?

Attempting to add code coverage. Doesn't work yet.

References

Fixes #564

[joshsmith]

No coverage being generated. Trying with COVERAGE=true ember test. Would appreciate someone else pulling down or spotting what I'm doing wrong.

[emosher]

I tried this too. What error are you seeing? For me it seems to chug along just fine until this happens:

ok 898 PhantomJS 1.9 - Unit | Utility | mention parser: it returns the unmodified task string when there are no mentions
not ok 899 PhantomJS 1.9 - Global error: INVALID_STATE_ERR: DOM Exception 11: An attempt was made to use an object that is not, or is no longer, usable. at http://localhost:7357/5484/tests/index.html?hidepassed, line 1071
    ---
        Log: |
            { type: 'error',
              text: 'INVALID_STATE_ERR: DOM Exception 11: An attempt was made to use an object that is not, or is no longer, usable. at http://localhost:7357/5484/tests/index.html?hidepassed, line 1071\n' }
    ...
not ok 900 PhantomJS 1.9 - Unit | Utility | mention parser: global failure
    ---
        actual: >
            null
        stack: >
            http://localhost:7357/5484/tests/index.html?hidepassed:1071
        message: >
            INVALID_STATE_ERR: DOM Exception 11: An attempt was made to use an object that is not, or is no longer, usable.
        Log: |
    ...

1..900
# tests 900
# pass  898
# skip  0
# fail  2

It then has another block saying "request aborted" and some additional error spewage.

[joshsmith]

@emosher I don't actually see an error or even any output at all. Nothing happens. No coverage generated whatsoever.

[joshsmith]

We need to run with COVERAGE=true.

Also concerned that this is causing issues:

// in mirage/config.js

  this.passthrough('/write-coverage');
  this.namespace = 'api';  // It's important that the passthrough for coverage is before the namespace, otherwise it will be prefixed.

We don't use namespace, but wondering if perhaps we should be.

[joshsmith]

@begedin thoughts on the above comment?

[begedin]

@joshsmith I'm not sure how the namespace would interact with our actual app setup (where api. is just part of the URL). We should probably give it a try to see how it works.

[joshsmith]

Actually it looks like namespace is not a subdomain but something like /baz in foo.com/baz.

[coveralls]

Changes Unknown when pulling d21f853 on 564-add-code-coverage into ** on develop**.

[coveralls]

Changes Unknown when pulling fa0d5c5 on 564-add-code-coverage into ** on develop**.

[coveralls]

Changes Unknown when pulling 0e68e85 on 564-add-code-coverage into ** on develop**.