Jest tests for <RaAmplifyAuthProvider /> & related hooks

[mayteio]

Test coverage possible via hooks, use @testing-library/react-hooks.

useAuth()

• test error when not inside provider. Potentially refactor to checkContext function and isolate that test.
• Mock @aws-amplify/Auth and test value returned is equal to mocked value.

useAuthProvider()

• mock Auth with jest.fn() for each method called
• test each method is called when the authProvider method is called
• login - test Auth.signIn called with username & password
• login - test Auth.federatedSignIn called with provider property
• getPermissions - test Promise resolves to [claims: {}, identityId: ""] based on mocks

useUser()

• test undefined return in unauthenticated state
• mock signIn and check returned user value is {}
• mock signOut and check returned value is undefined
• note: @aws-amplify/Hub may not need to be mocked as it's a local event bus