Function: approve(address _spender, uint256 _value)

Allow a token owner to authorize another account to spend a specified amount of their tokens.

Inputs

• _spender

  • Control: Controlled by the user.

  • Constraints: N/A.

  • Impact: Becomes authorized to spend a specified amount of the caller's tokens.

• _value

  • Control: Controlled by the user.

  • Constraints: N/A.

  • Impact: Sets the maximum number of tokens _spender can transfer from the token owner's balance.

Branches and code coverage (including function calls)

Intended branches

• Successful approval.

  Test coverage

Negative behavior

• Approval of zero value.

  Negative test