public async Task ThenItShouldCallTheApiWithTheCorrectUrl(int pageNumber, int pageSize, string toDateString)
{
// Arrange
var toYear = int.Parse(toDateString.Substring(0, 4));
var toMonth = int.Parse(toDateString.Substring(4, 2));
var toDay = int.Parse(toDateString.Substring(6, 2));
// Act
await _apiClient.GetPageOfAccounts(pageNumber, pageSize, new DateTime(toYear, toMonth, toDay));
// Assert
var expectedUrl = $"http://some-url/api/accounts?pageNumber={pageNumber}&pageSize={pageSize}&toDate={toDateString}";
_httpClient.Verify(c => c.GetAsync(expectedUrl), Times.Once);
}