MSTestDiscoverer.cs

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices;
using Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices.Interface;
using Microsoft.VisualStudio.TestPlatform.ObjectModel;
using Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter;
using Microsoft.VisualStudio.TestPlatform.ObjectModel.Logging;

namespace Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter;

/// <summary>
/// Contains the discovery logic for this adapter.
/// </summary>
[DefaultExecutorUri(MSTestAdapter.PlatformServices.EngineConstants.ExecutorUriString)]
[FileExtension(".xap")]
[FileExtension(".appx")]
[FileExtension(".dll")]
[FileExtension(".exe")]
internal sealed class MSTestDiscoverer : ITestDiscoverer
{
    private readonly ITestSourceHandler _testSourceHandler;

    public MSTestDiscoverer()
        : this(new TestSourceHandler())
    {
    }

    internal /* for testing purposes */ MSTestDiscoverer(ITestSourceHandler testSourceHandler)
        => _testSourceHandler = testSourceHandler;

    /// <summary>
    /// Discovers the tests available from the provided source. Not supported for .xap source.
    /// </summary>
    /// <param name="sources">Collection of test containers.</param>
    /// <param name="discoveryContext">Context in which discovery is being performed.</param>
    /// <param name="logger">Logger used to log messages.</param>
    /// <param name="discoverySink">Used to send testcases and discovery related events back to Discoverer manager.</param>
    [System.Security.SecurityCritical]
    [SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0", Justification = "Discovery context can be null.")]
    public void DiscoverTests(IEnumerable<string> sources, IDiscoveryContext discoveryContext, IMessageLogger logger, ITestCaseDiscoverySink discoverySink)
        => DiscoverTests(sources, discoveryContext, logger, discoverySink, null, isMTP: false);

    internal void DiscoverTests(IEnumerable<string> sources, IDiscoveryContext discoveryContext, IMessageLogger logger, ITestCaseDiscoverySink discoverySink, IConfiguration? configuration, bool isMTP)
    {
#if NET6_0_OR_GREATER
        ArgumentNullException.ThrowIfNull(sources);
        ArgumentNullException.ThrowIfNull(logger);
        ArgumentNullException.ThrowIfNull(discoverySink);
#else
        if (sources is null)
        {
            throw new ArgumentNullException(nameof(sources));
        }

        if (logger is null)
        {
            throw new ArgumentNullException(nameof(logger));
        }

        if (discoverySink is null)
        {
            throw new ArgumentNullException(nameof(discoverySink));
        }
#endif

        if (MSTestDiscovererHelpers.InitializeDiscovery(sources, discoveryContext, logger, configuration, _testSourceHandler))
        {
            new UnitTestDiscoverer(_testSourceHandler).DiscoverTests(sources, logger, discoverySink, discoveryContext, isMTP);
        }
    }
}