shoc-backend/SeaHaven.Services.Tests/PagedResultTests.cs

using FluentAssertions;
using SeaHaven.Services.DTOs;
using Xunit;

namespace SeaHaven.Services.Tests;

public class PagedResultTests
{
    [Theory]
    [InlineData(0, 10, 0)]
    [InlineData(1, 10, 1)]
    [InlineData(10, 10, 1)]
    [InlineData(11, 10, 2)]
    [InlineData(100, 25, 4)]
    public void TotalPages_IsCeilingOfCountOverPageSize(int totalCount, int pageSize, int expectedPages)
    {
        var result = new PagedResult<string> { TotalCount = totalCount, PageSize = pageSize, Page = 1 };

        result.TotalPages.Should().Be(expectedPages);
    }

    [Fact]
    public void HasPrevious_IsFalseOnFirstPage_TrueAfterward_OneBased()
    {
        new PagedResult<string> { Page = 1, PageSize = 10, TotalCount = 30 }.HasPrevious.Should().BeFalse();
        new PagedResult<string> { Page = 2, PageSize = 10, TotalCount = 30 }.HasPrevious.Should().BeTrue();
    }

    [Fact]
    public void HasNext_IsTrueBeforeLastPage_FalseOnLastPage_OneBased()
    {
        new PagedResult<string> { Page = 2, PageSize = 10, TotalCount = 30 }.HasNext.Should().BeTrue();
        new PagedResult<string> { Page = 3, PageSize = 10, TotalCount = 30 }.HasNext.Should().BeFalse();
    }

    [Fact]
    public void HasPrevious_And_HasNext_ZeroBased_WhenPageBaseIsZero()
    {
        var first = new PagedResult<string> { Page = 0, PageSize = 10, TotalCount = 30, PageBase = 0 };
        first.HasPrevious.Should().BeFalse();
        first.HasNext.Should().BeTrue();

        var middle = new PagedResult<string> { Page = 1, PageSize = 10, TotalCount = 30, PageBase = 0 };
        middle.HasPrevious.Should().BeTrue();
        middle.HasNext.Should().BeTrue();

        var last = new PagedResult<string> { Page = 2, PageSize = 10, TotalCount = 30, PageBase = 0 };
        last.HasPrevious.Should().BeTrue();
        last.HasNext.Should().BeFalse();
    }
}