Update integration tests to utilize StopLight.io's Prism version v2.X

[thinkingserious]

Issue Summary

We use a mock server for integration/contract testing that is driven by our OpenAPI specification and StopLight.io's Prism service. The service is spun up utilizing the prism.sh script in this repo.

Before writing any code, we suggest you review our CONTRIBUTING.md file and propose your solution for discussion here in the comments. Thank you!

Aceptance Criteria

• we automatically use the latest v2.X version of Prism locally, in Travis CI and in Docker
• tests pass locally, in Travis CI and using Docker
• update CONTRIBUTING.md documentation, if necessary

Notes & References

• Prism GitHub Repo

[aslafy-z]

I had a try with prism v2 but i'm not able to run the mock server (haven't tried docker release).
Openned an issue here: stoplightio/prism#152

Here are my findings:

New installer url: https://raw.githubusercontent.com/stoplightio/prism/2.x/install.sh
New command to mock: prism mock --spec https://raw.githubusercontent.com/sendgrid/sendgrid-oai/master/oai_stoplight.json
Update tests globbing:

• "**/*.spec.js" becomes $(find . -name '*.spec.js' ! -ipath '*node_modules*')
• "packages/client/**/*.spec.js" becomes $(find packages/client -name '*.spec.js' ! -ipath '*node_modules*')

Also, It seems that incorrect values are sent to api in packages/client/src/client.spec.js (Prism 0.6 was trowing bunch of errors about this)
eg: /v3/access_settings/whitelist/{rule_id} should be /v3/access_settings/whitelist/MYRULE, no ?
If needed, here the list of the in-url variables names grabbed in this client.spec.js:
rule_id alert_id api_key_id group_id email campaign_id client_type
custom_field_id list_id recipient_id segment_id pool_name id_address
batch_id request_id sender_id subuser_name token username template_id
version_id batch_id hostname id ip link_id

EDIT: Just seen it working in the CI pipeline (https://travis-ci.org/sendgrid/sendgrid-nodejs/jobs/437594883). Doesn't work so good here.

[YoungNastyMan]

I got Prism 2.0 working locally. I shall try to take this up if that's ok.

[YoungNastyMan]

It looks like Prism 2.x no longer understands the X-Mock header. It apparently uses an __code query string parameter now as mentioned here

[YoungNastyMan]

@thinkingserious Any inputs on this? If there's that I need to change in the PR, please let me know.

[childish-sambino]

Closing as prism integration has been moved to https://github.com/sendgrid/sendgrid-oai/