nodejs-bigquery - convert samples test ava to mocha

[vijay-qlogic]

Fixes #Convert all sample tests to mocha (it's a good idea to open an issue first for discussion)

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[JustinBeckwith]

👋 gentle ping

[vijay-qlogic]

@JustinBeckwith strange! locally all tests passing form me, but not here

[JustinBeckwith]

So this will sound crazy. Try pinning @types/sinon to version 5.0.5 with no range specifier, and see if it works.

[JustinBeckwith]

Heh apologies - I meant in the root package.json, not samples/package.json

[vijay-qlogic]

Worked 👍