public async void TickerAsync_should_success(string jsonString, string currencyPair)
{
//arrange
var response = TestHelper.CreateJsonResponse(jsonString);
var obj = new PublicApi(TestHelper.CreateApiClientWithMockHttpAccessor(response));
//act
var actual = await obj.TickerAsync(currencyPair);
//assert
Assert.NotNull(actual);
Assert.IsAssignableFrom <TickerResponse>(actual);
}