const calculator = require("./calculator");

describe("add", () => {
  test("adds 0 and 0", () => {
    expect(calculator.add(0, 0)).toBe(0);
  });

  test.skip("adds 2 and 2", () => {
    expect(calculator.add(2, 2)).toBe(4);
  });

  test.skip("adds positive numbers", () => {
    expect(calculator.add(2, 6)).toBe(8);
  });
});

describe("subtract", () => {
  test.skip("subtracts numbers", () => {
    expect(calculator.subtract(10, 4)).toBe(6);
  });
});

describe("sum", () => {
  test.skip("computes the sum of an empty array", () => {
    expect(calculator.sum([])).toBe(0);
  });

  test.skip("computes the sum of an array of one number", () => {
    expect(calculator.sum([7])).toBe(7);
  });

  test.skip("computes the sum of an array of two numbers", () => {
    expect(calculator.sum([7, 11])).toBe(18);
  });

  test.skip("computes the sum of an array of many numbers", () => {
    expect(calculator.sum([1, 3, 5, 7, 9])).toBe(25);
  });
});

describe("multiply", () => {
  test.skip("multiplies two numbers", () => {
    expect(calculator.multiply([2, 4])).toBe(8);
  });

  test.skip("multiplies several numbers", () => {
    expect(calculator.multiply([2, 4, 6, 8, 10, 12, 14])).toBe(645120);
  });
});

describe("power", () => {
  test.skip("raises one number to the power of another number", () => {
    expect(calculator.power(4, 3)).toBe(64); // 4 to third power is 64
  });
});

describe("factorial", () => {
  test.skip("computes the factorial of 0", () => {
    expect(calculator.factorial(0)).toBe(1); // 0! = 1
  });

  test.skip("computes the factorial of 1", () => {
    expect(calculator.factorial(1)).toBe(1);
  });

  test.skip("computes the factorial of 2", () => {
    expect(calculator.factorial(2)).toBe(2);
  });

  test.skip("computes the factorial of 5", () => {
    expect(calculator.factorial(5)).toBe(120);
  });

  test.skip("computes the factorial of 10", () => {
    expect(calculator.factorial(10)).toBe(3628800);
  });
});