more revert tests for claim

Author: kumaryash90

contracts/lib/Strings2.sol

@@ -0,0 +1,25 @@
+
+pragma solidity ^0.8.0;
+
+library Strings2 {
+
+    ///@dev converts bytes array to its ASCII hex string representation
+    /// TODO: Definitely more efficient way to do this by processing multiple (16?) bytes at once
+    /// but really a helper function for the tests, efficiency not key.
+    function toHexString(bytes memory input) public pure returns (string memory) {
+        require(input.length < type(uint256).max / 2 - 1);
+        bytes16 symbols = "0123456789abcdef";
+        bytes memory hex_buffer = new bytes(2 * input.length + 2);
+        hex_buffer[0] = "0";
+        hex_buffer[1] = "x";
+
+        uint pos = 2;
+        uint256 length = input.length;
+        for (uint i = 0; i < length; ++i) {
+            uint _byte = uint8(input[i]);
+            hex_buffer[pos++] = symbols[_byte >> 4];
+            hex_buffer[pos++] = symbols[_byte & 0xf];
+        }
+        return string(hex_buffer);
+    }
+}