quantconnect--lean/Tests/AssemblyInitialize.cs

/*
 * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
 * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/

using System;
using System.IO;
using NUnit.Framework;
using NUnit.Framework.Interfaces;
using QuantConnect.Configuration;
using QuantConnect.Logging;
using QuantConnect.Python;
using QuantConnect.Tests;
using QuantConnect.Util;

[assembly: MaintainLogHandler()]
namespace QuantConnect.Tests
{
    [SetUpFixture]
    public class AssemblyInitialize
    {
        [OneTimeSetUp]
        public void InitializeTestEnvironment()
        {
            AdjustCurrentDirectory();
        }

        public static void AdjustCurrentDirectory()
        {
            // nunit 3 sets the current folder to a temp folder we need it to be the test bin output folder
            var dir = TestContext.CurrentContext.TestDirectory;
            Environment.CurrentDirectory = dir;
            Directory.SetCurrentDirectory(dir);
            Config.Reset();
            Globals.Reset();
            PythonInitializer.Initialize();
            PythonInitializer.AddPythonPaths(
                new[]
                {
                "./Alphas",
                "./Execution",
                "./Portfolio",
                "./Risk",
                "./Selection",
                "./RegressionAlgorithms",
                "./Research/RegressionScripts",
                "../../../Algorithm",
                "../../../Algorithm/Selection",
                "../../../Algorithm.Framework",
                "../../../Algorithm.Framework/Selection",
                "../../../Algorithm.Python"
                });
        }
    }

    [AttributeUsage(AttributeTargets.Assembly)]
    public class MaintainLogHandlerAttribute : Attribute, ITestAction
    {
        public static ILogHandler LogHandler { get; private set; }

        public MaintainLogHandlerAttribute()
        {
            LogHandler = LoadLogHandler();
        }

        /// <summary>
        /// Replace the log handler if it has been changed
        /// </summary>
        /// <param name="details"></param>
        public void BeforeTest(ITest details)
        {
            if (Log.LogHandler != LogHandler)
            {
                Log.LogHandler = LogHandler;
            }
        }

        public void AfterTest(ITest details)
        {
            //NOP
        }

        /// <summary>
        /// Set to act on all tests
        /// </summary>
        public ActionTargets Targets => ActionTargets.Test;

        /// <summary>
        /// Load the log handler defined by test context parameters. Defaults to ConsoleLogHandler if no
        /// "log-handler" parameter is found.
        /// </summary>
        /// <returns>An instance of a new LogHandler</returns>
        private static ILogHandler LoadLogHandler()
        {
            if (TestContext.Parameters.Exists("log-handler"))
            {
                var logHandler = TestContext.Parameters["log-handler"];
                Log.Trace($"QuantConnect.Tests.AssemblyInitialize(): Log handler test parameter loaded {logHandler}");

                return Composer.Instance.GetExportedValueByTypeName<ILogHandler>(logHandler);
            }

            // If no parameter just use ConsoleLogHandler
            return new ConsoleLogHandler();
        }
    }
}