Bitpay\Client\ClientTest::testCheckPriceAndCurrency PHP Method

    public function testCheckPriceAndCurrency()
    {
        $client = new ChildOfClient();
        $res = $client->checkPriceAndCurrency(0.999999, 'BTC');
        $this->assertNull($res);
        $res = $client->checkPriceAndCurrency(1000, 'USD');
        $this->assertNull($res);
        $res = $client->checkPriceAndCurrency(0, 'USD');
        $this->assertNull($res);
        $res = $client->checkPriceAndCurrency(0.01, 'USD');
        $this->assertNull($res);
        $res = $client->checkPriceAndCurrency(99, 'USD');
        $this->assertNull($res);
        $res = $client->checkPriceAndCurrency(100.9, 'USD');
        $this->assertNull($res);
    }