Foundry Book

assertApproxEqRel

Signature

function assertApproxEqRel(uint256 left, uint256 right, uint256 maxPercentDelta) internal;

function assertApproxEqRel(uint256 left, uint256 right, uint256 maxPercentDelta, string memory err) internal;

function assertApproxEqRel(int256 left, int256 right, uint256 maxPercentDelta) internal;

function assertApproxEqRel(int256 left, int256 right, uint256 maxPercentDelta, string memory err) internal;

Description

Asserts left is approximately equal to right with delta in percentage, where 1e18 is 100%.

Optionally includes an error message in the revert string.

Examples

function testRevert() external {
    uint256 a = 100;
    uint256 b = 200;
    assertApproxEqRel(a, b, 0.4e18);
}

[FAIL: assertion failed: 100 !~= 200 (max delta: 40.0000000000000000%, real delta: 50.0000000000000000%)] testRevert() (gas: 23884)

SEE ALSO

• assertApproxEqRelDecimal
• assertApproxEqAbs