no-conditional-in-test.md

Pattern: Conditional logic in test

Issue: -

Description

Using conditional statements in tests makes them harder to understand and maintain. Each test should verify a single, specific case without branching logic.

Examples

Example of incorrect code:

it("test", () => {
  if (mode === "dev") {
    expect(value).toBe(1);
  } else {
    expect(value).toBe(2);
  }
});

it("test", () => {
  switch(type) {
    case "A": verifyA();
    case "B": verifyB();
  }
});

Example of correct code:

it("test in dev mode", () => {
  setMode("dev");
  expect(value).toBe(1);
});

it("test in prod mode", () => {
  setMode("prod");
  expect(value).toBe(2);
});

it("verifies type A", () => {
  verifyA();
});

it("verifies type B", () => {
  verifyB();
});