Solana Developer Learns Why Testing What Code Rejects Matters More Than Happy Paths

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A developer completing a 100-day Solana learning challenge built a small on-chain program called proof-of-ship, which permanently records that a wallet has shipped a project — limited to once per wallet. The uniqueness rule is enforced not by custom logic but by Solana's account model, where a program-derived address (PDA) with fixed seeds can only be initialized once. While writing tests for the capstone project, the developer realized that a failure-path test — deliberately attempting a second ship from the same wallet — was just as critical as verifying the happy path. On a public, permissionless blockchain, confirming that the runtime rejects invalid actions is what establishes real security guarantees. The experience reshaped the developer's testing philosophy: if you cannot write a test for what your program refuses to do, the rule may not truly be enforced.

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