Test that different auths request different grants.

[todo]

Using a TokenAuth should request a `refresh_token` grant. Using a UsernameAuth should request a `password` grant, and using no auth should request a client_credentials grant. This is currently pending nock/nock#2171.

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snoots/test/helper/accessToken.test.ts

Lines 72 to 77 in 7391759

	// TODO: Test that different auths request different grants.
	// BODY: Using a TokenAuth should request a `refresh_token` grant. Using a
	// BODY: UsernameAuth should request a `password` grant, and using no auth
	// BODY: should request a client_credentials grant. This is currently
	// BODY: pending https://github.com/nock/nock/issues/2171.
	});

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This issue was generated by todo based on a TODO comment in 7391759. It's been assigned to @thislooksfun because they committed the code.

[thislooksfun]

This was implemented way back in aa2a199