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Challenge: Build a Transfer Function

Create a function that builds a SOL transfer transaction. The function should take a sender public key, recipient public key, and amount in SOL, then return the transaction object ready to be signed.

Requirements

  • Accept sender (PublicKey), recipient (PublicKey), and amount (number, in SOL)
  • Convert SOL amount to lamports
  • Create and return a Transaction with a SystemProgram.transfer instruction

Test Cases

Returns a Transaction
Input: sender, recipient, 1.0Expected: result instanceof Transaction
Contains exactly one instruction
Input: sender, recipient, 1.0Expected: result.instructions.length === 1
Converts SOL to the correct lamports amount
Input: sender, recipient, 1.0Expected: result.instructions[0].lamports === 1000000000
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