<?php use GuzzleHttp\Client; use GuzzleHttp\Handler\MockHandler; use GuzzleHttp\HandlerStack; use GuzzleHttp\Psr7\Response; use PHPUnit\Framework\TestCase; final class ExchangeRateTest extends TestCase { public function setUp(): void { $mock = new MockHandler([ new Response(200, [], '{"rates":{"BRL":5.0929215633},"base":"USD","date":"2020-03-27"}'), ]); $handlerStack = HandlerStack::create($mock); $this->httpClient = new Client(['handler' => $handlerStack]) } public function testExchangeRateReturn(): void { $this->assertEquals(5.0929215633, return_exchange_rate($this->httpClient)); } }