// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
using Microsoft.Extensions.Time.Testing;
using Xunit;
 
namespace Microsoft.Extensions.Diagnostics.ResourceMonitoring.Test;
 
public class SnapshotTests
{
    [Fact]
    public void BasicInitializaiton()
    {
        var time = new FakeTimeProvider();
 
        // Constructor provided TimeSpan
        var snapshot = new Snapshot(TimeSpan.FromTicks(time.GetUtcNow().Ticks), TimeSpan.Zero, TimeSpan.FromSeconds(1), 10);
        Assert.Equal(time.GetUtcNow().Ticks, snapshot.TotalTimeSinceStart.Ticks);
 
        // Constructor provided IClock
        snapshot = new Snapshot(time, TimeSpan.Zero, TimeSpan.FromSeconds(1), 10);
        Assert.Equal(time.GetUtcNow().Ticks, snapshot.TotalTimeSinceStart.Ticks);
    }
 
    [Fact]
    public void Constructor_ProvidedWithNegativeValueOfKernelTimeSinceStart_ThrowsArgumentOutOfRangeException()
    {
        Assert.Throws<ArgumentOutOfRangeException>(()
            => new Snapshot(new FakeTimeProvider(), TimeSpan.MinValue, TimeSpan.FromSeconds(1), 1000));
    }
 
    [Fact]
    public void Constructor_ProvidedWithNegativeValueOfUserTimeSinceStart_ThrowsArgumentOutOfRangeException()
    {
        Assert.Throws<ArgumentOutOfRangeException>(()
            => new Snapshot(new FakeTimeProvider(), TimeSpan.Zero, TimeSpan.MinValue, 1000));
    }
}