ladybird/Libraries/LibJS/Tests/builtins/functions/parseFloat.js

test("parsing numbers", () => {
  [
    [0, 0],
    [1, 1],
    [0.23, 0.23],
    [1.23, 1.23],
    [0.0123e2, 1.23],
    [1.23e4, 12300],
    [Infinity, Infinity],
  ].forEach(test => {
    expect(parseFloat(test[0])).toBe(test[1]);
    expect(parseFloat(+test[0])).toBe(test[1]);
    expect(parseFloat(-test[0])).toBe(-test[1]);
  });
});

test("parsing strings", () => {
  [
    ["0", 0],
    ["1", 1],
    [".23", 0.23],
    ["1.23", 1.23],
    ["0.0123E+2", 1.23],
    ["1.23e4", 12300],
    ["Infinity", Infinity],
  ].forEach(test => {
    expect(parseFloat(test[0])).toBe(test[1]);
    expect(parseFloat(`+${test[0]}`)).toBe(test[1]);
    expect(parseFloat(`-${test[0]}`)).toBe(-test[1]);
    expect(parseFloat(`${test[0]}foo`)).toBe(test[1]);
    expect(parseFloat(`+${test[0]}foo`)).toBe(test[1]);
    expect(parseFloat(`-${test[0]}foo`)).toBe(-test[1]);
    expect(parseFloat(`   \n  \t ${test[0]} \v  foo   `)).toBe(test[1]);
    expect(parseFloat(`   \r -${test[0]} \f \n\n  foo   `)).toBe(-test[1]);
    expect(parseFloat({ toString: () => test[0] })).toBe(test[1]);
  });
});

test("parsing NaN", () => {
  [
    "",
    [],
    [],
    true,
    false,
    null,
    undefined,
    NaN,
    "foo123",
    "foo+123",
    "fooInfinity",
    "foo+Infinity",
  ].forEach(value => {
    expect(parseFloat(value)).toBeNaN();
  });

  expect(parseFloat()).toBeNaN();
  expect(parseFloat("", 123, Infinity)).toBeNaN();
});