A mock tests selected behaviors, not every property of a real integration.
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A practice opponent can imitate chosen moves without reproducing every real player.
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A valid counter call, step by stepStep 1 / 4
This example begins with count zero and a request to call increment(). No real contract is deployed.
This example begins with count zero and a request to call increment(). No real contract is deployed.Execution follows the code’s input and permission rules. A website button is not the access-control mechanism.The function reads zero, calculates zero plus one, and writes one to persistent storage.The accepted state contains count one. Later reads can inspect it. Events are emitted only if the code implements them.
Animated local teaching model. No wallet, RPC or live blockchain data. Some labels and hashes are abbreviated for readability.
State what the mock represents
A token mock may return true and move exact amounts. That fixture does not automatically cover fee-on-transfer, hooks or rebasing behavior.
Add hostile variants
Use reverting, false-returning, malformed-output and callback variants where relevant. A cooperative mock alone leaves important trust-boundary assumptions unexplored.
Keep integration evidence separate
Tests against a specific real implementation can add compatibility evidence, but still depend on its version, state and upgrade model.
Avoid universal claims
Document supported dependencies and unsupported behaviors. Passing one mock suite does not establish compatibility with every contract sharing an ABI.
Define the test
mock matrix:
normal success
false return
empty return
revert
callback
fee or balance-change variant
Test plans are framework-neutral unless labeled as complete Solidity or JavaScript. Use a local test environment and no real funds.
QUICK CHECK · NO PRESSURE
Does a true-returning token mock establish compatibility with every token?