Add results directory arg to dotnet test

src/dotnet/commands/dotnet-test/LocalizableStrings.cs

@@ -55,5 +55,7 @@ internal class LocalizableStrings
 
         public const string RunSettingsArgsHelpText = @"Any extra commandline runsettings arguments that should be passed to vstest. See 'dotnet vstest --help' for available options.
                                         Example: -- RunConfiguration.ResultsDirectory=""C:\users\user\desktop\Results Directory"" MSTest.DeploymentEnabled=false";
+        public const string CmdResultsDirectoryDescription = @"Test results directory will be created in specified path if not exists.
+                                        Example: --results-directory <PATH_TO_RESULTS_DIRECTORY>";
     }
 }

src/dotnet/commands/dotnet-test/Program.cs

@@ -83,6 +83,11 @@ public static int Run(string[] args)
                LocalizableStrings.CmdNoBuildDescription,
                CommandOptionType.NoValue);
 
+            var resultsDirectoryOption = cmd.Option(
+                "-r|--results-directory",
+                LocalizableStrings.CmdResultsDirectoryDescription,
+                CommandOptionType.SingleValue);
+
             CommandOption verbosityOption = MSBuildForwardingApp.AddVerbosityOption(cmd);
 
             cmd.OnExecute(() =>
@@ -129,6 +134,11 @@ public static int Run(string[] args)
                     msbuildArgs.Add($"/p:TargetFramework={frameworkOption.Value()}");
                 }
 
+                if (resultsDirectoryOption.HasValue())
+                {
+                    msbuildArgs.Add($"/p:VSTestResultsDirectory={resultsDirectoryOption.Value()}");
+                }
+
                 if (outputOption.HasValue())
                 {
                     msbuildArgs.Add($"/p:OutputPath={outputOption.Value()}");