Write the code, and everything that describes it, with the
writing-lean
skill.
Test our code, not the dependency. Test the behaviour our code adds, and take the package as
given: import its values rather than copying its tables, and leave its behaviour to its own tests.
Single source of truth. Take each value from where it is defined: the Tailwind scale
(
max-w-7xl
, not
max-w-[1468px]
), a shared constant, or the package's own types.
Spec style. Set up and tear down in the test framework's hooks. Arrange, act, then assert,
and assert the whole result, so an extra item fails the test.
Fake the clock whenever a spec depends on the time, so it passes at any hour and in any time
zone.