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Tooling · hard

39. Testing with Foundry

Unit tests, cheatcodes and fuzzing.

1 min read3 questionsup to 50 XPtopic 39/50

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Foundry tests are Solidity contracts. `setUp()` runs before each test, and cheatcodes such as `vm.prank`, `vm.warp` and `vm.expectRevert` control the environment.

solidity
function testFuzz_Stake(uint96 amt) public {
    vm.assume(amt > 0);
    vm.prank(alice);
    staking.stake(amt);
    assertEq(staking.balanceOf(alice), amt);
}

Any parameterised test is fuzzed automatically; add invariant tests for properties that must hold after any sequence of calls.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. What does `vm.prank` do?

  2. 2. How do you fast-forward time?

  3. 3. What makes a Foundry test fuzzed?

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