support the gdUnitMono tests

resharper/src/UnitTesting/GodotGdUnitTestRunnerHost.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Reflection;
+using JetBrains.Annotations;
+using JetBrains.Collections.Viewable;
+using JetBrains.ReSharper.Feature.Services.Protocol;
+using JetBrains.ReSharper.UnitTestFramework.Execution.TestRunner;
+using JetBrains.Rider.Model.Godot.FrontendBackend;
+using JetBrains.Util;
+
+namespace JetBrains.ReSharper.Plugins.Godot.UnitTesting
+{
+    public class GodotGdUnitTestRunnerHost : DefaultTestRunnerHost
+    {
+        [NotNull] public new static readonly ITestRunnerHost Instance = new GodotGdUnitTestRunnerHost();
+        private const string godotPathEnvVarName = "GODOT_BIN";
+
+        public override IPreparedProcess StartProcess(ProcessStartInfo startInfo, ITestRunnerContext context)
+        {
+            var solution = context.RuntimeEnvironment.Project.GetSolution();
+            var model = solution.GetProtocolSolution().GetGodotFrontendBackendModel();
+            if (model.GodotPath.HasValue()) 
+                startInfo.EnvironmentVariables.Add(godotPathEnvVarName, model.GodotPath.Value);
+
+            return base.StartProcess(startInfo, context);
+        }
+    }
+}

resharper/src/UnitTesting/GodotTestRunnerHostProvider.cs

@@ -1,3 +1,4 @@
+using System;
 using JetBrains.ProjectModel;
 using JetBrains.ProjectModel.Impl;
 using JetBrains.ReSharper.Feature.Services.Protocol;
@@ -18,6 +19,10 @@ public GodotTestRunnerHostProvider(ISolution solution)
 
         public ITestRunnerHost TryGetHost(IProject project, TargetFrameworkId targetFrameworkId)
         {
+            if (!(project.ProjectProperties.DotNetCorePlatform?.Sdk != null && 
+                project.ProjectProperties.DotNetCorePlatform.Sdk.StartsWith("Godot.NET.SDK", StringComparison.OrdinalIgnoreCase))) 
+                return null;
+            if (project.GetModuleReference("gdUnit4Api") != null) return GodotGdUnitTestRunnerHost.Instance;
             var assemblyNameVersion = (project.GetModuleReference("GodotSharp") as ProjectToAssemblyReference)?.ReferenceTarget.AssemblyName.Version;
             if (assemblyNameVersion != null && project.IsGodotProject() && assemblyNameVersion.Major >= 4) return GodotCoreTestRunnerHost.Instance;
             return project.IsGodotProject() ? GodotTestRunnerHost.Instance : null;