public async Task FindOpenPositionsWorksCorrectly()
        {
            var p1 = await _underTest.OpenAsync("EUR", "USD", 200, 1.2f);

            var p2 = await _underTest.OpenAsync("EUR", "USD", 200, 1.2f);

            var p3 = await _underTest.OpenAsync("EUR", "USD", 200, 1.3f);

            var p4 = await _underTest.OpenAsync("EUR", "USD", 200, 1.3f);

            await _underTest.CloseAsync(p2, 250, 2, null);

            await _underTest.CloseAsync(p4, 250, 2, null);

            var positions = await _underTest.FindOpenPositionsAsync("EUR", "USD", 1.25f);

            positions.Count.Should().Be(1, "there are just two open and only one from them fits");
            positions[0].Id.Should().Be(p3, "only p3 is open and opened higher");
        }