// Copyright (C) Stichting Deltares 2019. All rights reserved.
//
// This file is part of the Delta Shell Light Library.
//
// The Delta Shell Light Library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using Deltares.Standard.TestUtils;
using NUnit.Framework;

namespace Deltares.Dam.Tests.TestUtils
{
    [TestFixture]
    public class ObjectLeakMonitorTest
    {
        [Test]
        public void IsAlive_ObjectStillInScope_True()
        {
            // setup
            var objectToMonitor = new object();
            var monitor = new ObjectLeakMonitor(objectToMonitor);

            // call
            var isAlive = monitor.ObjectIsAlive();

            // assert
            var text = objectToMonitor.ToString(); // To ensure it stays in scope
            Assert.IsTrue(isAlive, text);
        }

        [Test]
        public void MonitoredObjectType_ShouldBeTypeOfMonitoredObject()
        {
            // setup
            var objectToMonitor = new object();
            var monitor = new ObjectLeakMonitor(objectToMonitor);

            // call
            var type = monitor.MonitoredObjectType;

            // assert
            Assert.AreEqual(objectToMonitor.GetType(), type);
        }

        [Test]
        public void ObjectIsAlive_ObjectOutOfScope_False()
        {
            // setup
            var monitor = CreateObjectAndAssignToObjectLeakMonitor();

            // call
            var isAlive = monitor.ObjectIsAlive();

            // assert
            Assert.IsFalse(isAlive);
        }

        private ObjectLeakMonitor CreateObjectAndAssignToObjectLeakMonitor()
        {
            var objectToMonitor = new object(); // This object goes out of scope when the method returns, and will be garbage collectable
            return new ObjectLeakMonitor(objectToMonitor);
        }
    }
}