Nuclex.Support/Source/Parsing/CommandLine.Test.cs

#region Apache License 2.0
/*
Nuclex .NET Framework
Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#endregion // Apache License 2.0

using System;

#if UNITTEST

using NUnit.Framework;

namespace Nuclex.Support.Parsing {

  /// <summary>Ensures that the command line parser is working properly</summary>
  [TestFixture]
  internal class CommandLineTest {

    #region class ArgumentTest

    /// <summary>Unit test for the command line option class</summary>
    [TestFixture]
    public class ArgumentTest {

      /// <summary>
      ///   Verifies that the name of a command line argument without a value can
      ///   be extracted
      /// </summary>
      [Test]
      public void TestNameExtraction() {
        CommandLine.Argument argument = CommandLine.Argument.OptionOnly(
          new StringSegment("--test"), 2, 4
        );

        Assert.AreEqual("--test", argument.Raw);
        Assert.AreEqual("--", argument.Initiator);
        Assert.AreEqual("test", argument.Name);
        Assert.IsNull(argument.Associator);
        Assert.IsNull(argument.Value);
      }

      /// <summary>
      ///   Verifies that the name of a command line argument without a value can be
      ///   extracted when the argument is contained in a substring of a larger string
      /// </summary>
      [Test]
      public void TestNameExtractionFromSubstring() {
        CommandLine.Argument argument = CommandLine.Argument.OptionOnly(
          new StringSegment("||--test||", 2, 6), 4, 4
        );

        Assert.AreEqual("--test", argument.Raw);
        Assert.AreEqual("--", argument.Initiator);
        Assert.AreEqual("test", argument.Name);
        Assert.IsNull(argument.Associator);
        Assert.IsNull(argument.Value);
      }

      /// <summary>
      ///   Varifies that the name and value of a command line argument can be extracted
      /// </summary>
      [Test]
      public void TestValueExtraction() {
        CommandLine.Argument argument = new CommandLine.Argument(
          new StringSegment("--test=123"), 2, 4, 7, 3
        );

        Assert.AreEqual("--test=123", argument.Raw);
        Assert.AreEqual("--", argument.Initiator);
        Assert.AreEqual("test", argument.Name);
        Assert.AreEqual("=", argument.Associator);
        Assert.AreEqual("123", argument.Value);
      }

      /// <summary>
      ///   Varifies that the name and value of a command line argument can be extracted
      ///   when the argument is contained in a substring of a larger string
      /// </summary>
      [Test]
      public void TestValueExtractionFromSubstring() {
        CommandLine.Argument argument = new CommandLine.Argument(
          new StringSegment("||--test=123||", 2, 10), 4, 4, 9, 3
        );

        Assert.AreEqual("--test=123", argument.Raw);
        Assert.AreEqual("--", argument.Initiator);
        Assert.AreEqual("test", argument.Name);
        Assert.AreEqual("=", argument.Associator);
        Assert.AreEqual("123", argument.Value);
      }

      /// <summary>
      ///   Varifies that the name and value of a command line argument can be extracted
      ///   when the option is assigned a quoted value
      /// </summary>
      [Test]
      public void TestQuotedValueExtraction() {
        CommandLine.Argument argument = new CommandLine.Argument(
          new StringSegment("--test=\"123\"", 0, 12), 2, 4, 8, 3
        );

        Assert.AreEqual("--test=\"123\"", argument.Raw);
        Assert.AreEqual("--", argument.Initiator);
        Assert.AreEqual("test", argument.Name);
        Assert.AreEqual("=", argument.Associator);
        Assert.AreEqual("123", argument.Value);
      }

      /// <summary>
      ///   Varifies that the associator of a command line argument with an open ended
      ///   value assignment can be retrieved
      /// </summary>
      [Test]
      public void TestValuelessAssociatorRetrieval() {
        CommandLine.Argument argument = CommandLine.Argument.OptionOnly(
          new StringSegment("--test="), 2, 4
        );

        Assert.AreEqual("--test=", argument.Raw);
        Assert.AreEqual("--", argument.Initiator);
        Assert.AreEqual("test", argument.Name);
        Assert.AreEqual("=", argument.Associator);
        Assert.IsNull(argument.Value);
      }

      /// <summary>
      ///   Varifies that the associator of a command line option with an open ended value
      ///   assignment can be retrieved when the option is contained in a substring of
      ///   a larger string
      /// </summary>
      [Test]
      public void TestValuelessAssociatorRetrievalFromSubstring() {
        CommandLine.Argument option = CommandLine.Argument.OptionOnly(
          new StringSegment("||--test=||", 2, 7), 4, 4
        );

        Assert.AreEqual("--test=", option.Raw);
        Assert.AreEqual("--", option.Initiator);
        Assert.AreEqual("test", option.Name);
        Assert.AreEqual("=", option.Associator);
        Assert.IsNull(option.Value);
      }

      /// <summary>
      ///   Varifies that a command line argument without an option name can be retrieved
      /// </summary>
      [Test]
      public void TestNamelessValueRetrieval() {
        CommandLine.Argument argument = CommandLine.Argument.ValueOnly(
          new StringSegment("\"hello world\""), 1, 11
        );

        Assert.AreEqual("\"hello world\"", argument.Raw);
        Assert.IsNull(argument.Initiator);
        Assert.IsNull(argument.Name);
        Assert.IsNull(argument.Associator);
        Assert.AreEqual("hello world", argument.Value);
      }

      /// <summary>
      ///   Varifies that a command line argument without an option name can be retrieved
      ///   that is contained in a substring of larger string
      /// </summary>
      [Test]
      public void TestNamelessValueRetrievalFromSubstring() {
        CommandLine.Argument argument = CommandLine.Argument.ValueOnly(
          new StringSegment("||\"hello world\"||", 2, 13), 3, 11
        );

        Assert.AreEqual("\"hello world\"", argument.Raw);
        Assert.IsNull(argument.Initiator);
        Assert.IsNull(argument.Name);
        Assert.IsNull(argument.Associator);
        Assert.AreEqual("hello world", argument.Value);
      }

    }

    #endregion // class ArgumentTest

    /// <summary>Verifies that the default constructor is working</summary>
    [Test]
    public void TestDefaultConstructor() {
      CommandLine commandLine = new CommandLine();

      Assert.AreEqual(0, commandLine.Arguments.Count);
    }

    /// <summary>
    ///   Validates that the parser can handle an argument initiator with an
    ///   assignment that is missing a name
    /// </summary>
    [Test]
    public void TestParseAmbiguousNameResolution() {
      CommandLine commandLine = CommandLine.Parse("--:test");

      // Without a name, this is not a valid command line option, so it will
      // be parsed as a loose value instead.
      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("--:test", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("--:test", commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Verifies that a lone short argument initiator without anything behind
    ///   can be parsed
    /// </summary>
    [Test]
    public void TestParseShortArgumentInitiatorOnly() {
      CommandLine commandLine = CommandLine.Parse("-");

      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("-", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("-", commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Verifies that a lone long argument initiator without anything behind
    ///   can be parsed
    /// </summary>
    [Test]
    public void TestParseLongArgumentInitiatorOnly() {
      CommandLine commandLine = CommandLine.Parse("--");

      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("--", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("--", commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Validates that the parser can handle multiple lone argument initators without
    ///   a following argument
    /// </summary>
    [Test]
    public void TestParseArgumentInitiatorAtEnd() {
      CommandLine commandLine = CommandLine.Parse("-hello:-world -");

      Assert.AreEqual(2, commandLine.Arguments.Count);

      Assert.AreEqual("-hello:-world", commandLine.Arguments[0].Raw);
      Assert.AreEqual("-", commandLine.Arguments[0].Initiator);
      Assert.AreEqual("hello", commandLine.Arguments[0].Name);
      Assert.AreEqual(":", commandLine.Arguments[0].Associator);
      Assert.AreEqual("-world", commandLine.Arguments[0].Value);

      Assert.AreEqual("-", commandLine.Arguments[1].Raw);
      Assert.IsNull(commandLine.Arguments[1].Initiator);
      Assert.IsNull(commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.AreEqual("-", commandLine.Arguments[1].Value);
    }

    /// <summary>Validates that quoted arguments can be parsed</summary>
    [Test]
    public void TestParseQuotedValue() {
      CommandLine commandLine = CommandLine.Parse("hello -world --this -is=\"a test\"");

      Assert.AreEqual(4, commandLine.Arguments.Count);

      Assert.AreEqual("hello", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("hello", commandLine.Arguments[0].Value);

      Assert.AreEqual("-world", commandLine.Arguments[1].Raw);
      Assert.AreEqual("-", commandLine.Arguments[1].Initiator);
      Assert.AreEqual("world", commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.IsNull(commandLine.Arguments[1].Value);

      Assert.AreEqual("--this", commandLine.Arguments[2].Raw);
      Assert.AreEqual("--", commandLine.Arguments[2].Initiator);
      Assert.AreEqual("this", commandLine.Arguments[2].Name);
      Assert.IsNull(commandLine.Arguments[2].Associator);
      Assert.IsNull(commandLine.Arguments[2].Value);

      Assert.AreEqual("-is=\"a test\"", commandLine.Arguments[3].Raw);
      Assert.AreEqual("-", commandLine.Arguments[3].Initiator);
      Assert.AreEqual("is", commandLine.Arguments[3].Name);
      Assert.AreEqual("=", commandLine.Arguments[3].Associator);
      Assert.AreEqual("a test", commandLine.Arguments[3].Value);
    }

    /// <summary>Validates that null can be parsed</summary>
    [Test]
    public void TestParseNull() {
      CommandLine commandLine = CommandLine.Parse((string)null);

      Assert.AreEqual(0, commandLine.Arguments.Count);
    }

    /// <summary>Validates that a single argument without quotes can be parsed</summary>
    [Test]
    public void TestParseSingleNakedValue() {
      CommandLine commandLine = CommandLine.Parse("hello");

      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("hello", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("hello", commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Validates that the parser can handle a quoted argument that's missing
    ///   the closing quote
    /// </summary>
    [Test]
    public void TestParseQuotedArgumentWithoutClosingQuote() {
      CommandLine commandLine = CommandLine.Parse("\"Quoted argument");

      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("\"Quoted argument", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("Quoted argument", commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Validates that the parser correctly handles a quoted value assignment that's
    ///   missing the closing quote
    /// </summary>
    [Test]
    public void TestParseQuotedValueWithoutClosingQuote() {
      CommandLine commandLine = CommandLine.Parse("--test=\"Quoted argument");

      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("--test=\"Quoted argument", commandLine.Arguments[0].Raw);
      Assert.AreEqual("--", commandLine.Arguments[0].Initiator);
      Assert.AreEqual("test", commandLine.Arguments[0].Name);
      Assert.AreEqual("=", commandLine.Arguments[0].Associator);
      Assert.AreEqual("Quoted argument", commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Validates that the parser can handle an command line consisting of only spaces
    /// </summary>
    [Test]
    public void TestParseSpacesOnly() {
      CommandLine commandLine = CommandLine.Parse(" \t ");

      Assert.AreEqual(0, commandLine.Arguments.Count);
    }

    /// <summary>
    ///   Validates that the parser can handle a quoted option
    /// </summary>
    [Test]
    public void TestParseQuotedOption() {
      CommandLine commandLine = CommandLine.Parse("--\"hello\"");

      // Quoted options are not supported, so this becomes a loose value
      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("--\"hello\"", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("--\"hello\"", commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Validates that the parser can handle multiple lone argument initators without
    ///   a following argument
    /// </summary>
    [Test]
    public void TestParseMultipleLoneArgumentInitiators() {
      CommandLine commandLine = CommandLine.Parse("--- --");

      Assert.AreEqual(2, commandLine.Arguments.Count);

      Assert.AreEqual("---", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("---", commandLine.Arguments[0].Value);

      Assert.AreEqual("--", commandLine.Arguments[1].Raw);
      Assert.IsNull(commandLine.Arguments[1].Initiator);
      Assert.IsNull(commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.AreEqual("--", commandLine.Arguments[1].Value);
    }

    /// <summary>
    ///   Verifies that the parser correctly handles options with embedded option initiators
    /// </summary>
    [Test]
    public void TestParseOptionWithEmbeddedInitiator() {
      CommandLine commandLine = CommandLine.Parse("-hello/world=123 -test-case");

      Assert.AreEqual(2, commandLine.Arguments.Count);

      Assert.AreEqual("-hello/world=123", commandLine.Arguments[0].Raw);
      Assert.AreEqual("-", commandLine.Arguments[0].Initiator);
      Assert.AreEqual("hello/world", commandLine.Arguments[0].Name);
      Assert.AreEqual("=", commandLine.Arguments[0].Associator);
      Assert.AreEqual("123", commandLine.Arguments[0].Value);

      Assert.AreEqual("-test-case", commandLine.Arguments[1].Raw);
      Assert.AreEqual("-", commandLine.Arguments[1].Initiator);
      Assert.AreEqual("test-case", commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.IsNull(commandLine.Arguments[1].Value);
    }

    /// <summary>
    ///   Validates that arguments and values without spaces inbetween can be parsed
    /// </summary>
    [Test]
    public void TestParseOptionAndValueWithoutSpaces() {
      CommandLine commandLine = CommandLine.Parse("\"value\"-option\"value\"");

      Assert.AreEqual(3, commandLine.Arguments.Count);

      Assert.AreEqual("\"value\"", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("value", commandLine.Arguments[0].Value);

      Assert.AreEqual("-option", commandLine.Arguments[1].Raw);
      Assert.AreEqual("-", commandLine.Arguments[1].Initiator);
      Assert.AreEqual("option", commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.IsNull(commandLine.Arguments[1].Value);

      Assert.AreEqual("\"value\"", commandLine.Arguments[2].Raw);
      Assert.IsNull(commandLine.Arguments[2].Initiator);
      Assert.IsNull(commandLine.Arguments[2].Name);
      Assert.IsNull(commandLine.Arguments[2].Associator);
      Assert.AreEqual("value", commandLine.Arguments[2].Value);
    }

    /// <summary>
    ///   Validates that options with modifiers at the end of the command line
    ///   are parsed successfully
    /// </summary>
    [Test]
    public void TestParseOptionWithModifierAtEnd() {
      CommandLine commandLine = CommandLine.Parse("--test-value- -test+");

      Assert.AreEqual(2, commandLine.Arguments.Count);

      Assert.AreEqual("--test-value-", commandLine.Arguments[0].Raw);
      Assert.AreEqual("--", commandLine.Arguments[0].Initiator);
      Assert.AreEqual("test-value", commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("-", commandLine.Arguments[0].Value);

      Assert.AreEqual("-test+", commandLine.Arguments[1].Raw);
      Assert.AreEqual("-", commandLine.Arguments[1].Initiator);
      Assert.AreEqual("test", commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.AreEqual("+", commandLine.Arguments[1].Value);
    }

    /// <summary>
    ///   Validates that options with values assigned to them are parsed successfully
    /// </summary>
    [Test]
    public void TestParseOptionWithAssignment() {
      CommandLine commandLine = CommandLine.Parse("-hello: -world=321");

      Assert.AreEqual(2, commandLine.Arguments.Count);

      Assert.AreEqual("-hello:", commandLine.Arguments[0].Raw);
      Assert.AreEqual("-", commandLine.Arguments[0].Initiator);
      Assert.AreEqual("hello", commandLine.Arguments[0].Name);
      Assert.AreEqual(":", commandLine.Arguments[0].Associator);
      Assert.IsNull(commandLine.Arguments[0].Value);

      Assert.AreEqual("-world=321", commandLine.Arguments[1].Raw);
      Assert.AreEqual("-", commandLine.Arguments[1].Initiator);
      Assert.AreEqual("world", commandLine.Arguments[1].Name);
      Assert.AreEqual("=", commandLine.Arguments[1].Associator);
      Assert.AreEqual("321", commandLine.Arguments[1].Value);
    }

    /// <summary>
    ///   Validates that options with an empty value at the end of the command line
    ///   string are parsed successfully
    /// </summary>
    [Test]
    public void TestParseOptionAtEndOfString() {
      CommandLine commandLine = CommandLine.Parse("--test:");

      Assert.AreEqual(1, commandLine.Arguments.Count);
      Assert.AreEqual("--test:", commandLine.Arguments[0].Raw);
      Assert.AreEqual("--", commandLine.Arguments[0].Initiator);
      Assert.AreEqual("test", commandLine.Arguments[0].Name);
      Assert.AreEqual(":", commandLine.Arguments[0].Associator);
      Assert.IsNull(commandLine.Arguments[0].Value);
    }

    /// <summary>
    ///   Verifies that the parser can recognize windows command line options if
    ///   configured to windows mode
    /// </summary>
    [Test]
    public void TestWindowsOptionInitiator() {
      CommandLine commandLine = CommandLine.Parse("/hello //world", true);

      Assert.AreEqual(2, commandLine.Arguments.Count);

      Assert.AreEqual("/hello", commandLine.Arguments[0].Raw);
      Assert.AreEqual("/", commandLine.Arguments[0].Initiator);
      Assert.AreEqual("hello", commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.IsNull(commandLine.Arguments[0].Value);

      Assert.AreEqual("//world", commandLine.Arguments[1].Raw);
      Assert.IsNull(commandLine.Arguments[1].Initiator);
      Assert.IsNull(commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.AreEqual("//world", commandLine.Arguments[1].Value);
    }

    /// <summary>
    ///   Verifies that the parser ignores windows command line options if
    ///   configured to non-windows mode
    /// </summary>
    [Test]
    public void TestNonWindowsOptionValues() {
      CommandLine commandLine = CommandLine.Parse("/hello //world", false);

      Assert.AreEqual(2, commandLine.Arguments.Count);

      Assert.AreEqual("/hello", commandLine.Arguments[0].Raw);
      Assert.IsNull(commandLine.Arguments[0].Initiator);
      Assert.IsNull(commandLine.Arguments[0].Name);
      Assert.IsNull(commandLine.Arguments[0].Associator);
      Assert.AreEqual("/hello", commandLine.Arguments[0].Value);

      Assert.AreEqual("//world", commandLine.Arguments[1].Raw);
      Assert.IsNull(commandLine.Arguments[1].Initiator);
      Assert.IsNull(commandLine.Arguments[1].Name);
      Assert.IsNull(commandLine.Arguments[1].Associator);
      Assert.AreEqual("//world", commandLine.Arguments[1].Value);
    }

    /// <summary>
    ///   Tests whether the existence of named arguments can be checked
    /// </summary>
    [Test]
    public void HasArgumentWorksForWindowsStyleArguments() {
      CommandLine test = CommandLine.Parse("/first:x /second:y /second:z third", true);

      Assert.IsTrue(test.HasArgument("first"));
      Assert.IsTrue(test.HasArgument("second"));
      Assert.IsFalse(test.HasArgument("third"));
      Assert.IsFalse(test.HasArgument("fourth"));
    }

    /// <summary>
    ///   Tests whether the existence of named arguments can be checked
    /// </summary>
    [Test]
    public void HasArgumentWorksForUnixStyleArguments() {
      CommandLine test = CommandLine.Parse("--first=x --second=y --second=z third", false);

      Assert.IsTrue(test.HasArgument("first"));
      Assert.IsTrue(test.HasArgument("second"));
      Assert.IsFalse(test.HasArgument("third"));
      Assert.IsFalse(test.HasArgument("fourth"));
    }

    /// <summary>
    ///   Tests whether a command line can be built with the command line class
    /// </summary>
    [Test]
    public void TestCommandLineFormatting() {
      CommandLine commandLine = new CommandLine(true);

      commandLine.AddValue("single");
      commandLine.AddValue("with space");
      commandLine.AddOption("option");
      commandLine.AddOption("@@", "extravagant-option");
      commandLine.AddAssignment("name", "value");
      commandLine.AddAssignment("name", "value with spaces");
      commandLine.AddAssignment("@@", "name", "value");
      commandLine.AddAssignment("@@", "name", "value with spaces");

      Assert.AreEqual(8, commandLine.Arguments.Count);
      Assert.AreEqual("single", commandLine.Arguments[0].Value);
      Assert.AreEqual("with space", commandLine.Arguments[1].Value);
      Assert.AreEqual("option", commandLine.Arguments[2].Name);
      Assert.AreEqual("@@", commandLine.Arguments[3].Initiator);
      Assert.AreEqual("extravagant-option", commandLine.Arguments[3].Name);
      Assert.AreEqual("name", commandLine.Arguments[4].Name);
      Assert.AreEqual("value", commandLine.Arguments[4].Value);
      Assert.AreEqual("name", commandLine.Arguments[5].Name);
      Assert.AreEqual("value with spaces", commandLine.Arguments[5].Value);
      Assert.AreEqual("@@", commandLine.Arguments[6].Initiator);
      Assert.AreEqual("name", commandLine.Arguments[6].Name);
      Assert.AreEqual("value", commandLine.Arguments[6].Value);
      Assert.AreEqual("name", commandLine.Arguments[7].Name);
      Assert.AreEqual("@@", commandLine.Arguments[7].Initiator);
      Assert.AreEqual("value with spaces", commandLine.Arguments[7].Value);

      string commandLineString = commandLine.ToString();
      Assert.AreEqual(
        "single \"with space\" " +
        "-option @@extravagant-option " +
        "-name=value -name=\"value with spaces\" " +
        "@@name=value @@name=\"value with spaces\"",
        commandLineString
      );

    }

    /// <summary>
    ///   Tests whether a command line can be built that contains empty arguments
    /// </summary>
    [Test]
    public void TestNullArgumentFormatting() {
      CommandLine commandLine = new CommandLine(false);

      commandLine.AddValue(string.Empty);
      commandLine.AddValue("hello");
      commandLine.AddValue(null);
      commandLine.AddValue("-test");

      Assert.AreEqual(4, commandLine.Arguments.Count);
      string commandLineString = commandLine.ToString();
      Assert.AreEqual("\"\" hello \"\" \"-test\"", commandLineString);
    }

  }

} // namespace Nuclex.Support.Parsing

#endif // UNITTEST