Fix run behaviour when only single target exists

test/dotnet-run.Tests/RunTests.cs

@@ -0,0 +1,54 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.IO;
+using Microsoft.DotNet.Tools.Test.Utilities;
+using Xunit;
+
+namespace Microsoft.DotNet.Tools.Compiler.Tests
+{
+    public class CompilerTests : TestBase
+    {
+        private static const string RunTestsBase = "RunTestsApps";
+
+        [WindowsOnlyFact]
+        public void RunsSingleTarget()
+        {
+            TestInstance instance = TestAssetsManager.CreateTestInstance(Path.Combine(RunTestsBase, "TestAppDesktopClr"))
+                                                     .WithLockFiles()
+                                                     .WithBuildArtifacts();
+            new RunCommand(testInstance.TestRoot).Execute().Should().Pass();
+        }
+
+        public void RunsDefaultWhenPresent()
+        {
+            TestInstance instance = TestAssetsManager.CreateTestInstance(Path.Combine(RunTestsBase, "TestAppMultiTarget"))
+                                                     .WithLockFiles()
+                                                     .WithBuildArtifacts();
+            new RunCommand(testInstance.TestRoot).Execute().Should().Pass();
+        }
+
+        public void FailsWithMultipleTargetAndNoDefault()
+        {
+            TestInstance instance = TestAssetsManager.CreateTestInstance(RunTestsBase, "TestAppMultiTargetNoCoreClr")
+                                                     .WithLockFiles()
+                                                     .WithBuildArtifacts();
+            new RunCommand(testInstance.TestRoot).Execute().Should().Fail();
+        }
+
+        private void CopyProjectToTempDir(string projectDir, TempDirectory tempDir)
+        {
+            // copy all the files to temp dir
+            foreach (var file in Directory.EnumerateFiles(projectDir))
+            {
+                tempDir.CopyFile(file);
+            }
+        }
+
+        private string GetProjectPath(TempDirectory projectDir)
+        {
+            return Path.Combine(projectDir.Path, "project.json");
+        }
+    }
+}

test/dotnet-run.Tests/dotnet-run.Tests.xproj

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0.24720" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0.24720</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DNX\Microsoft.DNX.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>35e3c2dc-9b38-4ec5-8dd7-c32458dc485f</ProjectGuid>
+    <RootNamespace>dotnet-run.Tests</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">..\..\artifacts\obj\$(MSBuildProjectName)</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">..\..\artifacts\bin\$(MSBuildProjectName)\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DNX\Microsoft.DNX.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>

test/dotnet-run.Tests/project.json

@@ -0,0 +1,23 @@
+{
+  "version": "1.0.0-*",
+  
+  "dependencies": {
+    "NETStandard.Library": "1.0.0-rc2-23811",      
+
+    "Microsoft.DotNet.Tools.Tests.Utilities": { "target": "project" },
+    "Microsoft.DotNet.Cli.Utils": {
+      "target": "project"
+    },
+
+    "xunit": "2.1.0",
+    "dotnet-test-xunit": "1.0.0-dev-48273-16"
+  },
+
+  "frameworks": {
+    "dnxcore50": {
+      "imports": "portable-net45+win8"
+    }
+  },
+
+  "testRunner": "xunit"
+}