Function: subBalance(AccountTypes.Account account, byte[32] tokenHash, uint128 amount)

This facilitates decreasing the balance of a given token for a given account.

Inputs

• account

  • Control: Fully controllable by calling function.

  • Constraints: None.

  • Impact: The account whose balance is to be decreased.

• tokenHash

  • Control: Fully controllable by calling function.

  • Constraints: None.

  • Impact: The token whose balance is to be decreased.

• amount

  • Control: Fully controllable by calling function.

  • Constraints: None.

  • Impact: The amount by which the balance is to be decreased.

Branches and code coverage

Intended branches

• Account balance is decreased by the amount.

  Test coverage

Negative behavior

• Should not allow decreasing balance for an invalid token. This is presumably checked at other functions' levels.

  Negative test