jest-advanced
Jest Advanced
Master advanced Jest features including custom matchers, parameterized tests with test.each, coverage configuration, and performance optimization. This skill covers sophisticated testing techniques for complex scenarios and large test suites.
Custom Matchers
Creating Custom Matchers
// matchers/toBeWithinRange.js
export function toBeWithinRange(received, floor, ceiling) {
const pass = received >= floor && received <= ceiling;
if (pass) {
return {
message: () =>
`expected ${received} not to be within range ${floor} - ${ceiling}`,
pass: true
};
} else {
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