Function: collectFeeTokenset()

This function collects a certain fraction of the basket into the fee-token set.

Branches and code coverage

Intended branches

• Calculate the amount of underlying asset to transfer to the fee-token set.

  Test coverage

• Transfer the underlying asset from the basket to the fee-token set.

  Test coverage

• Recalculate the new token set and apply.

  Test coverage

• Update the timestamp when fee is collected.

  Test coverage

Negative behavior

• The caller is a fee manager.

  Negative test

• Rebalancing and issuing features are not locked.

  Negative test