prefer-each.md

Pattern: Manual test loop

Issue: -

Description

Using manual loops for test cases is less readable and more error-prone than using Jest's built-in each functionality, which provides a clearer way to handle parameterized tests.

Examples

Example of incorrect code:

for (const item of items) {
  it("should process item", () => {
    expect(process(item)).toBe("result");
  });
}

Example of correct code:

it.each(items)("should process item", (item) => {
  expect(process(item)).toBe("result");
});