refactor(samples): convert sample tests from ava to mocha

[nareshqlogic]

Fixes convert all sample tests from ava to mocha #2865 (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]

@nareshqlogic I invited you to the googleapis org so your tests run automatically. Can you please check your email and accept those invitations? Thanks!

[nareshqlogic]

Hi @JustinBeckwith,

I didn't get email regarding googleapis org. Can you please resend ?

[JustinBeckwith]

I tried sending it again scratches head what happens if you visit https://github.com/googleapis?

[JustinBeckwith]

(also looks like you need to npm run fix)

[nareshqlogic]

If I visit https://github.com/googleapis then I will be able to see googleapis and as well as view invitation link. After clicking on link it moves on two_factor_authentication. Here I am not able to set country code for India. Will it work without two_factor_authentication?

[JustinBeckwith]

Nope, you need to have two factor auth enabled. Can you use the Google Authenticator app for android or iOS?

[nareshqlogic]

Hi @JustinBeckwith,
Now I have enabled two factor auth and I fix the lint issue.