public async Task TestGetAllInvoices()
        {
            using (var client = new TestClientProvider().Client)
            {
                var response = await client.GetAsync("/api/Commands/getinvoices");

                response.EnsureSuccessStatusCode();

                response.StatusCode.Should().Be(HttpStatusCode.OK);
            }
        }
        public async Task TestCreateInvoice()
        {
            using (var client = new TestClientProvider().Client)
            {
                var dateini  = "2020-01-01";
                var dateend  = "2020-01-15";
                var response = await client.GetAsync("/api/Commands/" + dateini + "/" + dateend);

                response.EnsureSuccessStatusCode();

                response.StatusCode.Should().Be(HttpStatusCode.OK);
            }
        }