text: import { calculateCost } from "../libs/billing-lib";
  
  test("Lowest tier", () => {
  	const storage = 10;
  	const cost = 4000;
  	const expectedCost = calculateCost(storage);
  	expect(cost).toEqual(expectedCost);
  	});
  
  test("Middle tier", () => {
  	const storage = 100;
  	const cost = 20000;
  	const expectedCost = calculateCost(storage);
  	expect(cost).toEqual(expectedCost);
  	});
  
  test("Highest tier", () => {
  	const storage = 101;
  	const cost = 10100;
  	const expectedCost = calculateCost(storage);
  	expect(cost).toEqual(expectedCost);
  	});