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

describe("add", function() {
  it("adds 0 and 0", function() {
    expect(calculator.add(0, 0)).toEqual(0);
  });

  it("adds 2 and 2", function() {
    expect(calculator.add(2, 2)).toEqual(4);
  });

  it("adds positive numbers", function() {
    expect(calculator.add(2, 6)).toEqual(8);
  });
});

describe("subtract", function() {
  it("subtracts numbers", function() {
    expect(calculator.subtract(10, 4)).toEqual(6);
  });
});

describe("sum", function() {
  it("computes the sum of an empty array", function() {
    expect(calculator.sum([])).toEqual(0);
  });

  it("computes the sum of an array of one number", function() {
    expect(calculator.sum([7])).toEqual(7);
  });

  it("computes the sum of an array of two numbers", function() {
    expect(calculator.sum([7, 11])).toEqual(18);
  });

  it("computes the sum of an array of many numbers", function() {
    expect(calculator.sum([1, 3, 5, 7, 9])).toEqual(25);
  });
});

describe("multiply", function() {
  it("multiplies two numbers", function() {
    expect(calculator.multiply([2, 4])).toEqual(8);
  });

  it("multiplies several numbers", function() {
    expect(calculator.multiply([2, 4, 6, 8, 10, 12, 14])).toEqual(645120);
  });
});

describe("power", function() {
  it("raises one number to the power of another number", function() {
    expect(calculator.power(4, 3)).toEqual(64); // 4 to third power is 64
  });
});

describe("factorial", function() {
  it("computes the factorial of 0", function() {
    expect(calculator.factorial(0)).toEqual(1); // 0! = 1
  });

  it("computes the factorial of 1", function() {
    expect(calculator.factorial(1)).toEqual(1);
  });

  it("computes the factorial of 2", function() {
    expect(calculator.factorial(2)).toEqual(2);
  });

  it("computes the factorial of 5", function() {
    expect(calculator.factorial(5)).toEqual(120);
  });

  it("computes the factorial of 10", function() {
    expect(calculator.factorial(10)).toEqual(3628800);
  });
});
