ladybird/Userland/Libraries/LibJS/Tests/operators/modulo-basic.js

test("basic functionality", () => {
    expect(10 % 3).toBe(1);
    expect(10.5 % 2.5).toBe(0.5);
    expect(-0.99 % 0.99).toBe(-0);

    // Examples from MDN:
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
    expect(12 % 5).toBe(2);
    expect(-1 % 2).toBe(-1);
    expect(1 % -2).toBe(1);
    expect(1 % 2).toBe(1);
    expect(2 % 3).toBe(2);
    expect(-4 % 2).toBe(-0);
    expect(5.5 % 2).toBe(1.5);
    expect(NaN % 2).toBeNaN();
    expect(2 % NaN).toBeNaN();
    expect(NaN % NaN).toBeNaN();
    expect(Infinity % 1).toBeNaN();
    expect(-Infinity % 1).toBeNaN();
    expect(1 % Infinity).toBe(1);
    expect(1 % -Infinity).toBe(1);
    expect(1 % 0).toBeNaN();
    expect(1 % -0).toBeNaN();
    expect(0 % 5).toBe(0);
    expect(-0 % 5).toBe(-0);

    // test262 examples
    expect(1 % null).toBeNaN();
    expect(null % 1).toBe(0);
    expect(true % null).toBeNaN();
    expect(null % true).toBe(0);
    expect("1" % null).toBeNaN();
    expect(null % "1").toBe(0);
    expect(null % undefined).toBeNaN();
    expect(undefined % null).toBeNaN();
    expect(undefined % undefined).toBeNaN();
    expect(null % null).toBeNaN();
});