fernandodof

async function getPricesLastDays(days) {
    try {
        const result = await fetch(`https://api.gold/price?days=${days}`);
        const prices = await result.json();

        const sum = prices.reduce((total, currentValue) => total + currentValue, 0);
        const average = sum / prices.length;

        return { average: +average.toFixed(2) };
    } catch (error) {

fernandodof

describe('When the average price is called for 7 days', () => {
    beforeEach(async () => {
        averagePrice = await getPricesLastDays(7);
    });

    it('Then the correct average should be returned', () => {
        expect(averagePrice).toEqual({ average: MOCK_AVERAGE });
    });
});

fernandodof

const result = await fetch(`https://api.gold/price?days=${days}`);
const prices = await result.json();

fernandodof

const MOCK_PRICES = [50, 47, 53, 50, 49, 51, 52];

global.fetch = jest.fn(() => Promise.resolve({
    json: () => Promise.resolve(MOCK_PRICES)
}));

fernandodof

const MOCK_PRICES = [50, 47, 53, 50, 49, 51, 52];
const MOCK_AVERAGE = 50.29;

global.fetch = jest.fn(() => Promise.resolve({
    json: () => Promise.resolve(MOCK_PRICES)
}));

describe('Gold prices', () => {
    let averagePrice;

fernandodof

describe('When the promise is rejected', () => {
    beforeEach(async () => {
        fetch.mockRejectedValueOnce(new Error("I'm a teapot"));
        averagePrice = await getPricesLastDays(7);
    });

    it('Then the fuction should return null', () => {
        expect(averagePrice).toEqual(null);
    });
});

fernandodof

import React, { useCallback } from 'react';

import styles from './tabTitle.module.css';

export type Props = {
  title: string;
  index: number;
  setSelectedTab: (index: number) => void;
  isActive?: boolean;
};

fernandodof

import React, { ReactElement } from 'react';

type Props = {
  title: string;
  children: ReactElement | ReactElement[];
};

const TabPane = ({ children }: Props): JSX.Element => <div>{children}</div>;

export default TabPane;

fernandodof

import React, { ReactElement } from 'react';

type Props = {
  title: string;
  children: ReactElement | ReactElement[];
};

const TabPane = ({ children }: Props): JSX.Element => <div>{children}</div>;

export default TabPane;

fernandodof

import React, { ReactElement, useState } from 'react';

import styles from './tabs.module.css';
import TabTitle, { Props as TabTitleProps } from './TabTitle';

type Props = {
  children: ReactElement<TabTitleProps>[];
  preSelectedTabIndex?: number;
};