import { caesarCipher } from "./caesarCipher.js";

// function that takes a string and a shift factor and returns it with each character “shifted”
test ('Function throws error if either argument is missing', () => {
    expect(() => caesarCipher()).toThrow('Invalid inputs!');
    expect(() => caesarCipher(null, 8)).toThrow('Invalid inputs!');
    expect(() => caesarCipher('fish')).toThrow('Invalid inputs!');
});
test ('Function throws error if shift factor is not a number', () => {
    expect(() => caesarCipher('string', {})).toThrow('Invalid inputs!');
});
test ('Function throws error on non-String input', () => {
    expect(() => caesarCipher([8], 8)).toThrow('Invalid inputs!');
});
test ('Function throws error on blank String input', () => {
    expect(() => caesarCipher('', 8)).toThrow('Invalid inputs!');
});
test ('Function returns String when passed valid input String', () => {
    const tester = caesarCipher('string', 8);
    expect(tester).toEqual(expect.any(String));
});
test ('Function returns factor-shifted String', () => {
    const tester = caesarCipher('string', 13);
    const tester2 = caesarCipher('string', 2);
    expect(tester).toBe('fgevat');
    expect(tester2).toBe('uvtkpi');
});
test ('Function returns factor-shifted String when given negative factor', () => {
    const tester = caesarCipher('abba', -15);
    expect(tester).toBe('lmml');
});