Add new setting RunnerExtraArguments to runsettings (#270)

poc/TestOfTestFramework/nano.runsettings

@@ -12,5 +12,6 @@
        <IsRealHardware>False</IsRealHardware><!--Set to true to run tests on real hardware. -->
        <CLRVersion></CLRVersion><!--Specify the nanoCLR version to use. If not specified, the latest available will be used. -->
        <PathToLocalCLRInstance></PathToLocalCLRInstance><!--Specify the path to a local nanoCLR instance. If not specified, the default one installed with nanoclr CLR witll be used. -->
+       <RunnerExtraArguments></RunnerExtraArguments><!--Specify extra arguments to pass to the test runner. -->
    </nanoFrameworkAdapter>
-</RunSettings>
+</RunSettings>

poc/TestOfTestFrameworkByReference/nano.runsettings

@@ -13,5 +13,6 @@
    <nanoFrameworkAdapter>
        <Logging>None</Logging>
        <IsRealHardware>False</IsRealHardware>
+       <RunnerExtraArguments></RunnerExtraArguments><!--Specify extra arguments to pass to the test runner. -->
    </nanoFrameworkAdapter>
-</RunSettings>
+</RunSettings>

source/TestAdapter/Executor.cs

@@ -670,6 +670,12 @@ namespace nanoFramework.TestPlatform.TestAdapter
                 arguments.Append(" -v diag");
             }
 
+            // add any extra arguments
+            if (!string.IsNullOrEmpty(_settings.RunnerExtraArguments))
+            {
+                arguments.Append($" {_settings.RunnerExtraArguments} ");
+            }
+
             _logger.LogMessage(
                 $"Launching nanoCLR with these arguments: '{arguments}'",
                 Settings.LoggingLevel.Verbose);

source/TestAdapter/Settings.cs

@@ -39,6 +39,11 @@ namespace nanoFramework.TestPlatform.TestAdapter
         /// </summary>
         public LoggingLevel Logging { get; set; } = LoggingLevel.None;
 
+        /// <summary>
+        /// Extra arguments to pass to the test runner.
+        /// </summary>
+        public string RunnerExtraArguments { get; set; } = string.Empty;
+
         /// <summary>
         /// Get settings from an XML node
         /// </summary>
@@ -82,6 +87,12 @@ namespace nanoFramework.TestPlatform.TestAdapter
                 {
                     settings.PathToLocalCLRInstance = pathtolocalclrinstance.Value;
                 }
+
+                var runnerExtraArguments = node.SelectSingleNode(nameof(RunnerExtraArguments))?.FirstChild;
+                if (runnerExtraArguments != null && runnerExtraArguments.NodeType == XmlNodeType.Text)
+                {
+                    settings.RunnerExtraArguments = runnerExtraArguments.Value;
+                }
             }
 
             return settings;