Split.CharArray.cs

using System;
using Xunit;

namespace PrimeFuncPack.Core.Tests;

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

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

    public static TestTheoryData SplitToFlatArray_WithCharSeparators_ExpectCorrectState_Cases
        =>
        [
            new(null, [','], StringSplitOptions.None, null, default),
            new(string.Empty, [','], StringSplitOptions.None, [string.Empty], 1),
            new(string.Empty, [','], StringSplitOptions.RemoveEmptyEntries, null, default),
            new("a,b;c", [',', ';'], StringSplitOptions.None, ["a", "b", "c"], 3),
            new("a,,c", [',', ';'], StringSplitOptions.None, ["a", "", "c"], 3),
            new("a,,c", [','], StringSplitOptions.RemoveEmptyEntries, ["a", "c"], 2),
            new(",;a;;b,", [',', ';'], StringSplitOptions.None, ["", "", "a", "", "b", ""], 6),
            new(",;a;;b,", [',', ';'], StringSplitOptions.RemoveEmptyEntries, ["a", "b"], 2),
            new(" a | b ; c ", ['|', ';'], StringSplitOptions.None, [" a ", " b ", " c "], 3),
            new(" a | b ; c ", ['|', ';'], StringSplitOptions.TrimEntries, ["a", "b", "c"], 3),
            new(" a |  ; c ", ['|', ';'], StringSplitOptions.TrimEntries, ["a", "", "c"], 3),
            new(" a |  ; c ", ['|', ';'], StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries, ["a", "c"], 2),
            new("a\tb c", [], StringSplitOptions.None, ["a", "b", "c"], 3),
            new("   ", [], StringSplitOptions.None, ["", "", "", ""], 4),
            new("   ", [], StringSplitOptions.RemoveEmptyEntries, null, default),
            new("  a   b  ", [], StringSplitOptions.RemoveEmptyEntries, ["a", "b"], 2),
            new("one", ['x', 'y'], StringSplitOptions.None, ["one"], 1),
            new("xone", ['x'], StringSplitOptions.None, ["", "one"], 2),
            new("onex", ['x'], StringSplitOptions.RemoveEmptyEntries, ["one"], 1),
            new("a||b;;c", ['|', ';'], StringSplitOptions.RemoveEmptyEntries, ["a", "b", "c"], 3),
            new("a| |c", ['|'], StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries, ["a", "c"], 2),
            new("α,β;γ", [',', ';'], StringSplitOptions.None, ["α", "β", "γ"], 3),
            new("a,b c", null, StringSplitOptions.None, ["a,b", "c"], 2)
        ];
}