chore(carto): Add test coverage for sources

[donmccurdy]

+10% coverage in @deck.gl/carto.

before	after

Related:

• Tracker: Restoring unit tests #8592

[donmccurdy]

• chore(carto): Add test coverage for sources #8613 👈
• master

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[coveralls]

coverage: 82.609% (+1.0%) from 81.639%
when pulling 6642c64 on donmccurdy/chore-carto-sources-test-coverage
into 28fb60f on master.

[felixpalmer]

Thanks for adding these 😊 !

[felixpalmer]

Why was it necessary to add this cache key?

[donmccurdy]

There's a module-level request cache ...

deck.gl/modules/carto/src/api/request-with-parameters.ts

Lines 12 to 19 in 28fb60f

	const REQUEST_CACHE = new Map();
	export async function requestWithParameters<T = any>({
	accessToken,
	baseUrl,
	parameters,
	headers: customHeaders,
	errorContext
	}: {

... and I couldn't see a way to clear that cache between test runs. The way that fetch() calls are mocked now, tilejson requests are identical and would otherwise hit the cache.