Boundary Analysis and Equivalence Class Testing Example

index.test.js

function isMinor(age) {
  return age >= 0 && age < 18
}

describe("isMinor", () => {

  it("should return true for any value between 0 and 18", () => {
    expect(isMinor(10)).toEqual(true);
  });

  it("should return true for 0", () => {
    expect(isMinor(0)).toEqual(true);
  });

  it("should return false for anything less than 0", () => {
    expect(isMinor(-1).toEqual(false);
  });

  it("should return true for 17", () => {
    expect(isMinor(17)).toEqual(true);
  });

  it("should return false for anything above 17", () => {
    expect(isMinor(18)).toEqual(false);
  });
});