Split.CharArray.Count.cs

using System;
using Xunit;

namespace PrimeFuncPack.Core.Tests;

using TestTheoryData = TheoryData<string?, char[]?, int, StringSplitOptions, string[]?, int>;

partial class FlatArrayExtensionsTest
{
    [Theory]
    [MemberData(nameof(SplitToFlatArray_WithCharSeparatorsAndCount_ExpectCorrectState_Cases))]
    public void SplitToFlatArray_WithCharSeparatorsAndCount_ExpectCorrectState(
        string? source, char[]? separators, int count, StringSplitOptions options, string[]? expectedItems, int expectedLength)
    {
        var actual = source.SplitToFlatArray(separators, count, options);
        actual.VerifyInnerState(expectedItems, expectedLength);
    }

    public static TestTheoryData SplitToFlatArray_WithCharSeparatorsAndCount_ExpectCorrectState_Cases
        =>
        [
            new(null, [','], 1, StringSplitOptions.None, null, default),
            new("a,b;c", [',', ';'], -5, StringSplitOptions.None, null, default),
            new("a,b;c", [',', ';'], -1, StringSplitOptions.RemoveEmptyEntries, null, default),
            new(string.Empty, [','], 1, StringSplitOptions.None, [string.Empty], 1),
            new(string.Empty, [','], 1, StringSplitOptions.RemoveEmptyEntries, null, default),
            new("a,b;c", [',', ';'], 1, StringSplitOptions.None, ["a,b;c"], 1),
            new("a,b;c", [',', ';'], 2, StringSplitOptions.None, ["a", "b;c"], 2),
            new("a,b;c", [',', ';'], 3, StringSplitOptions.None, ["a", "b", "c"], 3),
            new("a,b;c", [',', ';'], 10, StringSplitOptions.None, ["a", "b", "c"], 3),
            new("a,,c", [','], 2, StringSplitOptions.None, ["a", ",c"], 2),
            new("a,,c", [','], 3, StringSplitOptions.None, ["a", "", "c"], 3),
            new("a,,c", [','], 3, StringSplitOptions.RemoveEmptyEntries, ["a", "c"], 2),
            new(",;a;;b,", [',', ';'], 2, StringSplitOptions.None, ["", ";a;;b,"], 2),
            new(",;a;;b,", [',', ';'], 6, StringSplitOptions.None, ["", "", "a", "", "b", ""], 6),
            new(",;a;;b,", [',', ';'], 6, StringSplitOptions.RemoveEmptyEntries, ["a", "b"], 2),
            new(" a | b ; c ", ['|', ';'], 3, StringSplitOptions.TrimEntries, ["a", "b", "c"], 3),
            new(" a |  ; c ", ['|', ';'], 3, StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries, ["a", "c"], 2),
            new("a b c", null, 2, StringSplitOptions.None, ["a", "b c"], 2),
            new("a\tb c", [], 2, StringSplitOptions.None, ["a", "b c"], 2),
            new("a\tb c", [], 3, StringSplitOptions.None, ["a", "b", "c"], 3),
            new("   ", [], 1, StringSplitOptions.None, ["   "], 1),
            new("   ", [], 4, StringSplitOptions.RemoveEmptyEntries, null, default),
            new("  a   b  ", [], 2, StringSplitOptions.RemoveEmptyEntries, ["a", "b  "], 2),
            new("a b c", [], 2, StringSplitOptions.RemoveEmptyEntries, ["a", "b c"], 2),
            new("a,b", [','], 0, StringSplitOptions.None, null, default),
            new("one", ['x'], 3, StringSplitOptions.None, ["one"], 1),
            new("xone", ['x'], 2, StringSplitOptions.RemoveEmptyEntries, ["one"], 1)
        ];
}