<commit_before>﻿
#region Using Directives

using Antlr4.Runtime;
using Antlr4.Runtime.Tree;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Collections.Generic;
using System.CommandLine.Parser.Antlr;
using System.IO;
using System.Linq;

#endregion

namespace System.CommandLine.Parser.UnitTests
{
    /// <summary>
    /// Represents a unit testing class, which contains all of the unit tests for the command line parser.
    /// </summary>
    [TestClass]
    public class AntlrParserUnitTests
    {
        #region Private Methods

        /// <summary>
        /// Lexes the specified input.
        /// </summary>
        /// <param name="input">The input that is to be lexed.</param>
        /// <returns>Returns the lexed tokens from the specified input.</returns>
        private CommandLineLexer LexInput(string input)
        {
            // Creates a new stream input for the input string
            AntlrInputStream stream = new AntlrInputStream(new StringReader(input));

            // Lexes the input and returns the lexer
            CommandLineLexer lexer = new CommandLineLexer(stream);
            return lexer;
        }

        /// <summary>
        /// Parses the specified token stream.
        /// </summary>
        /// <param name="lexer">The lexer, which lexes the token consumed by the parser.</param>
        /// <returns>Returns the parse tree generated by parsing the specified token stream.</returns>
        private IParseTree ParseTokens(ITokenSource lexer)
        {
            // Parses the token stream
            CommandLineParser parser = new CommandLineParser(new CommonTokenStream(lexer));
            parser.BuildParseTree = true;
            IParseTree parseTree = parser.commandLine();

            // Returns the generated parse tree
            return parseTree;
        }
        
        #endregion

        #region General Test Methods

        /// <summary>
        /// Test if the ANTLR4 lexer and parser can handle empty command line parameters.
        /// </summary>
        [TestMethod]
        public void EmptyCommandLineParamentersTest()
        {
            // Lexes the input and checks whether there are no tokens
            CommandLineLexer lexer = this.LexInput(string.Empty);
            Assert.AreEqual(lexer.NextToken().Type, TokenConstants.Eof);

            // Parses the tokens and checks whether the resulting tree is empty
            IParseTree tree = this.ParseTokens(lexer);
            Assert.AreEqual(tree.ChildCount, 0);
        }

        #endregion
    }
}<commit_msg>Started to work on the test suit for the parser unit tests.<commit_after>﻿
#region Using Directives

using Antlr4.Runtime;
using Antlr4.Runtime.Tree;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Collections.Generic;
using System.CommandLine.Parser.Antlr;
using System.IO;
using System.Linq;

#endregion

namespace System.CommandLine.Parser.UnitTests
{
    /// <summary>
    /// Represents a unit testing class, which contains all of the unit tests for the command line parser.
    /// </summary>
    [TestClass]
    public class AntlrParserUnitTests
    {
        #region Private Methods

        /// <summary>
        /// Lexes the specified input.
        /// </summary>
        /// <param name="input">The input that is to be lexed.</param>
        /// <returns>Returns the lexed tokens from the specified input.</returns>
        private CommandLineLexer LexInput(string input)
        {
            // Creates a new stream input for the input string
            AntlrInputStream stream = new AntlrInputStream(new StringReader(input));

            // Lexes the input and returns the lexer
            CommandLineLexer lexer = new CommandLineLexer(stream);
            return lexer;
        }

        /// <summary>
        /// Parses the specified token stream.
        /// </summary>
        /// <param name="lexer">The lexer, which lexes the token consumed by the parser.</param>
        /// <returns>Returns the parse tree generated by parsing the specified token stream.</returns>
        private IParseTree ParseTokens(ITokenSource lexer)
        {
            // Parses the token stream
            CommandLineParser parser = new CommandLineParser(new CommonTokenStream(lexer));
            parser.BuildParseTree = true;
            IParseTree parseTree = parser.commandLine();

            // Returns the generated parse tree
            return parseTree;
        }
        
        #endregion

        #region General Test Methods

        /// <summary>
        /// Tests how the ANTLR4 parser handles empty command line parameters.
        /// </summary>
        [TestMethod]
        public void EmptyCommandLineParamentersTest()
        {
            // Lexes the input and checks whether there are no tokens
            CommandLineLexer lexer = this.LexInput(string.Empty);
            Assert.AreEqual(lexer.NextToken().Type, TokenConstants.Eof);

            // Parses the tokens and checks whether the resulting tree is empty
            IParseTree tree = this.ParseTokens(lexer);
            Assert.AreEqual(tree.ChildCount, 0);
        }

        #endregion

        #region Default Parameter Test Methods

        /// <summary>
        /// Tests how the ANTLR4 parser handles a single default parameter.
        /// </summary>
        [TestMethod]
        public void SingleDefaultParameterTest()
        {

        }

        /// <summary>
        /// Tests how the ANTLR4 parser handles multiple default parameters.
        /// </summary>
        [TestMethod]
        public void MutlipleDefaultParameterTest()
        {

        }

        #endregion

        #region Parameter Test Methods

        /// <summary>
        /// Tests how the ANTLR4 parser handles Windows style switches.
        /// </summary>
        [TestMethod]
        public void WindowsStyleSwitchTest()
        {

        }

        /// <summary>
        /// Tests how the ANTLR4 parser handles Windows style parameters.
        /// </summary>
        [TestMethod]
        public void WindowsStyleParameterTest()
        {

        }

        /// <summary>
        /// Tests how the ANTLR4 parser handles UNIX style switches.
        /// </summary>
        [TestMethod]
        public void UnixStyleSwitchTest()
        {

        }

        /// <summary>
        /// Tests how the ANTLR4 parser handles UNIX style parameters.
        /// </summary>
        [TestMethod]
        public void UnixStyleParameterTest()
        {

        }

        /// <summary>
        /// Tests how the ANTLR4 parser handles UNIX style flagged switches.
        /// </summary>
        [TestMethod]
        public void UnixStyleFlaggedSwitchesTest()
        {

        }

        /// <summary>
        /// Tests how the ANTLR4 parser handles multiple parameters.
        /// </summary>
        [TestMethod]
        public void MultipleParameterTest()
        {

        }

        #endregion

        #region Mixed Default Parameter & Parameter Test Methods

        /// <summary>
        /// Tests how the ANTLR4 parser handles mixing of default parameters and parameters.
        /// </summary>
        [TestMethod]
        public void MixedDefaultParameterAndParameterTest()
        {

        }

        #endregion
    }
}
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