check for help in DotNetTopLevelCommandBase

test/dotnet.Tests/GivenThatTheUserRequestsHelp.cs

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+// 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 FluentAssertions;
+using Microsoft.DotNet.Tools.Test.Utilities;
+using Xunit;
+
+namespace dotnet.Tests
+{
+    public class GivenThatTheUserRequestsHelp
+    {
+        [Theory]
+        [InlineData("-h")]
+        [InlineData("add -h")]
+        [InlineData("add package -h")]
+        [InlineData("add reference -h")]
+        [InlineData("build -h")]
+        [InlineData("cache -h")]
+        [InlineData("clean -h")]
+        [InlineData("list -h")]
+        [InlineData("migrate -h")]
+        [InlineData("msbuild -h")]
+        [InlineData("new -h")]
+        [InlineData("nuget -h")]
+        [InlineData("pack -h")]
+        [InlineData("publish -h")]
+        [InlineData("remove -h")]
+        [InlineData("restore -h")]
+        [InlineData("run -h")]
+        [InlineData("sln -h")]
+        [InlineData("sln add -h")]
+        [InlineData("sln list -h")]
+        [InlineData("sln remove -h")]
+        [InlineData("test -h")]
+        public void TheResponseIsNotAnError(string commandLine)
+        {
+            var result = new DotnetCommand()
+                .ExecuteWithCapturedOutput(commandLine);
+
+            result.ExitCode.Should().Be(0);
+        }
+    }
+}