Writing Tests

Smart contracts are immutable once deployed and often hold real value. A single bug can be unrecoverable, so thorough testing is essential.

• Catch logic errors before deployment.
• Document expected behavior.
• Guard against regressions when refactoring.

Hardhat uses Mocha as the test runner and Chai for assertions, both included in the Toolbox.

• describe groups related tests.
• it defines a single test case.
• expect makes assertions about values.

Tests live in the test/ folder.