NuGet.Client/test/NuGet.Core.Tests/NuGet.ProjectModel.Test/LazyStringSplitTests.cs

// Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE.md file in the project root for more information.

using System;
using System.Collections.Generic;
using Xunit;

namespace NuGet.ProjectModel.Test
{
    public sealed class LazyStringSplitTests
    {
        [Theory]
        [InlineData("a;b;c", ';', new[] { "a", "b", "c" })]
        [InlineData("a_b_c", '_', new[] { "a", "b", "c" })]
        [InlineData("aa;bb;cc", ';', new[] { "aa", "bb", "cc" })]
        [InlineData("aaa;bbb;ccc", ';', new[] { "aaa", "bbb", "ccc" })]
        [InlineData(";a;b;c", ';', new[] { "a", "b", "c" })]
        [InlineData("a;b;c;", ';', new[] { "a", "b", "c" })]
        [InlineData(";a;b;c;", ';', new[] { "a", "b", "c" })]
        [InlineData(";;a;;b;;c;;", ';', new[] { "a", "b", "c" })]
        [InlineData("", ';', new string[0])]
        [InlineData(";", ';', new string[0])]
        [InlineData(";;", ';', new string[0])]
        [InlineData(";;;", ';', new string[0])]
        [InlineData(";;;a", ';', new[] { "a" })]
        [InlineData("a;;;", ';', new[] { "a" })]
        [InlineData(";a;;", ';', new[] { "a" })]
        [InlineData(";;a;", ';', new[] { "a" })]
        [InlineData("a", ';', new[] { "a" })]
        [InlineData("aa", ';', new[] { "aa" })]
        public void ProducesCorrectEnumeration(string input, char delimiter, string[] expected)
        {
            // This boxes
            IEnumerable<string> actual = new LazyStringSplit(input, delimiter);

            Assert.Equal(expected, actual);

            // Non boxing foreach
            var list = new List<string>();

            foreach (var s in new LazyStringSplit(input, delimiter))
            {
                list.Add(s);
            }

            Assert.Equal(expected, list);

            // Equivalence with string.Split
            Assert.Equal(expected, input.Split(new[] { delimiter }, StringSplitOptions.RemoveEmptyEntries));
        }

        [Fact]
        public void Constructor_WithNullInput_Throws()
        {
            Assert.Throws<ArgumentNullException>(() => new LazyStringSplit(null!, ' '));
        }
    }
}