fix: changed hardhat_setCode code type

[vbar]

What 💻

Changed hardhat_setCode code parameter type to string encoding of a hex number.

Why ✋

Fixes #325 .

Evidence 📷

$ mocha test/helpers/setCode.ts 


  setCode
    ✔ should allow setting the code of a given address (115ms)
    accepted parameter types for code
      ✔ should not accept strings that are not 0x-prefixed
      ✔ should not accept non-hex strings


  3 passing (525ms)

Notes 📝

Note that the hardhat testsuite had been modified to pass the test: its original sample code doesn't pass test node checks.

[AnastasiiaVashchuk]

Note that the hardhat testsuite had been modified to pass the test: its original sample code doesn't pass test node checks.

why?

[vbar]

Note that the hardhat testsuite had been modified to pass the test: its original sample code doesn't pass test node checks.

why?

Because the sample string in https://github.com/eqlabs/hardhat/blob/86b2a7ed005fb1be01079b4ba498080a052948a7/packages/hardhat-network-helpers/test/helpers/setCode.ts#L20 (and https://github.com/eqlabs/hardhat/blob/86b2a7ed005fb1be01079b4ba498080a052948a7/packages/hardhat-network-helpers/test/helpers/setCode.ts#L22 ) has encodes data of length that isn't a multiple of 32.

[vbar]

The specific change is eqlabs/hardhat@1374bfc .