• Update validator tests to use POL token instead of MATIC
• Add new tests:
  • bridge POL from L1 to L2 and confirm native tokens balance increased on L2
  • bridge native token from L1 to L2 and confirm WETH balance increased on L2
  • withdraw native tokens from L2 and confirm native balance decreased on L2 and checkpoint was submitted
  • withdraw validator rewards
• Replace bash arithmetic comparisons, [[ ... -ge ... ]] with bc to avoid integer overflow on large token balances since bash is limited to 64-bit signed integers.

Related to 0xPolygon/polygon-cli#881