Getting a struct inside a map of a mock does not always return the proper structure

[jeremyjams]

Describe the bug Getting a struct inside a map of a mock does not always return the proper structure.

3 new tests reading a struct in a map have been added to the readable-storage-logic.spec.ts test suite.

• mapping(bytes32 => SimpleStruct) :heavy_check_mark:
• mapping(bytes32 => PackedStruct) :heavy_check_mark:
• mapping(bytes32 => OtherPackedStruct) :red_circle:

Reproduction steps

1. Checkout code to the attached PR (#189)
2. npm i
3. npx hardhat typechain
4. yarn run mocha test/unit/mock/readable-storage-logic.spec.ts

Expected behavior

• Expected output:

  {
  packedA: ADDRESS_EXAMPLE,
  packedB: '0x000000000000000000000001',
  }

• Actual output:

  should be able to get values in a bytes32 => OtherPackedStruct mapping:
  
    + expected - actual
  
     {
       "packedA": "0x558ba9b8d78713fbf768c1f8a584485B4003f43F"
    -  "packedB": "0x3f"
    +  "packedB": "0x000000000000000000000001"
     }

System Specs:

• OS: Linux/Ubuntu