Test Standards -- Examples & Patterns

Name: Test Standards
Rating: 65
Author: brunogsa

Reference examples for the testing rules defined in CLAUDE.md.

Good Test Names

•"should throw when params are missing"
•"should default pageSize to 10"
•"should return user info when params are valid"

Use Real-Like Mock Data

const mockUser = {
    id: "123",
    name: "Alice",
    email: "alice@example.com",
};

Parametrized Test Inputs

const testCases = [
    { input: 1, expected: 2 },
    { input: 2, expected: 3 },
];

testCases.forEach(({ input, expected }) => {
    test(`should return ${expected} for input ${input}`, () => {
        expect(fn(input)).toBe(expected);
    });
});

Don't Reproduce Logic Under Test

// Bad -- reproduces filtering logic:
const filtered = items.filter(...);
expect(myFunc(filtered)).toEqual(...);

// Good -- let the system under test do the work:
expect(myFunc(items)).toEqual(expectedFiltered);