import { lower } from '../Lower'

describe('Testing the Lower function', () => {
  it('Test 1: Check by invalid type', () => {
    expect(() => lower(345)).toThrowError();
    expect(() => lower(true)).toThrowError();
    expect(() => lower(null)).toThrowError();
  })

  it('Test 2: Check by uppercase string', () => {
    expect(lower('WORLD')).toBe('world');
    expect(lower('Hello_WORLD')).toBe('hello_world');
  })

  it('Test 3: Check by lowercase string', () => {
    expect(lower('hello')).toBe('hello');
    expect(lower('hello_world')).toBe('hello_world');
  })
})