public function testGetExchangeRates()
 {
     $data = $this->client->getExchangeRates('CAD');
     $this->assertInternalType('array', $data);
     $this->assertEquals('CAD', $data['currency']);
 }
 public function testGetExchangeRates()
 {
     $data = $this->client->getExchangeRates();
     $this->assertInternalType('array', $data);
 }