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Calldata with predicates
gnosis
Gnosis
**Background**
The Gnosis MockContract is a smart contract enabling developers to quickly mock contract interactions for unit tests.
It enables developers to
- Make dependent contracts return predefined values for different methods and arguments
- Simulate exceptions such as revert and outOfGas
- Assert on how often a dependency is called
The MockContract facilitates these features without requiring any separate test contracts. Check out the repo: https://github.com/gnosis/mock-contract
**Task**
Extend the functionality of the MockContract to mock contract interaction on calldata with predicate
s
_Acceptance criteria:_
- Develop a framework allowing developers to define predicates on calldata for specific methods.
The predicates should include GREATER_THAN with a definition similar to:
```python
const calldata = contract.methods.foo(
GREATER_THAN(10)
).encodeABI()
```
and the predicate SMALL_THAN
```python
const calldata = contract.methods.foo(
SMALLER_THAN(10)
).encodeABI()
```
- Write the logic for the MockContract to expose predefined returns to calldata with predicates.
Hence, it is expected that the following functions are provided for calldata with predicates:
```python
function givenPredicateCalldataReturn(bytes calldata call, bytes calldata response) external;
function givenPredicateCalldataReturnBool(bytes calldata call, bool response) external;
function givenPredicateCalldataReturnUint(bytes calldata call, uint response) external;
function givenPredicateCalldataReturnAddress(bytes calldata call, address response) external;
function givenPredicateCalldataRevert(bytes calldata call) external;
function givenPredicateCalldataRevertWithMessage(bytes calldata call, string calldata message) external;
function givenPredicateCalldataRunOutOfGas(bytes calldata call) external;
```
They should enable the same functionality on calldata with predicates as the current respective
functions with the same function names, but without the word "Predicate".
- Make sure the invocation count functions are still returning the right numbers
:
```python
function invocationCount() external returns (uint);
function invocationCountForMethod(bytes calldata method) external returns (uint);
function invocationCountForCalldata(bytes calldata call) external returns (uint);
```
- Current naming conventions need to be preserved
- All functionality must have 100 % line and branch coverage
- The [solidity style guide](https://solidity.readthedocs.io/en/v0.5.3/style-guide.html) must be considered and code must be linted
**Payout:**
0.75 ETH
Additional GNO can be tipped according to the level of technical implementation
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