69 lines
2.6 KiB
C#
69 lines
2.6 KiB
C#
using Bunit;
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using Microsoft.AspNetCore.Components;
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using ScadaLink.CentralUI.Components.Shared;
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namespace ScadaLink.CentralUI.Tests.Shared;
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/// <summary>
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/// Regression tests for CentralUI-016. <c>DataTable</c> looped
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/// <c>for i = 1..totalPages</c> and emitted one numbered <c><li></c>
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/// button per page; a few thousand records at page size 25 rendered hundreds
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/// of buttons into the diff on every state change. The fix windows the pager
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/// so only first / last / a small range around the current page render.
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/// </summary>
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public class DataTablePagerTests : BunitContext
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{
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private IRenderedComponent<DataTable<int>> RenderTable(int itemCount, int pageSize = 25)
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{
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return Render<DataTable<int>>(parameters => parameters
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.Add(p => p.Items, Enumerable.Range(1, itemCount).ToList())
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.Add(p => p.PageSize, pageSize)
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.Add(p => p.ShowSearch, false)
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.Add(p => p.HeaderContent, (RenderFragment)(b => b.AddMarkupContent(0, "<th>N</th>")))
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.Add(p => p.RowContent, (RenderFragment<int>)(item => b => b.AddMarkupContent(0, $"<tr><td>{item}</td></tr>"))));
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}
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private static int NumberedPageButtons(IRenderedComponent<DataTable<int>> cut)
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=> cut.FindAll("ul.pagination li.page-item button")
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.Count(b => int.TryParse(b.TextContent.Trim(), out _));
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[Fact]
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public void Pager_WithThousandsOfPages_RendersWindowedNotEveryPage()
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{
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// 5000 items / 25 = 200 pages. The pre-fix pager rendered 200 numbered
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// buttons; the windowed pager renders at most a dozen.
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var cut = RenderTable(itemCount: 5000);
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var numbered = NumberedPageButtons(cut);
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Assert.True(numbered <= 12,
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$"Expected a windowed pager (<= 12 numbered buttons) but rendered {numbered}.");
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}
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[Fact]
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public void Pager_SmallDataset_StillRendersEveryPage()
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{
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// 5 pages — small enough to render all numbered buttons (no windowing harm).
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var cut = RenderTable(itemCount: 125);
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var numbered = NumberedPageButtons(cut);
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Assert.Equal(5, numbered);
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}
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[Fact]
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public void Pager_WindowedAroundCurrentPage_AlwaysIncludesFirstAndLast()
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{
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var cut = RenderTable(itemCount: 5000); // 200 pages
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var numbered = cut.FindAll("ul.pagination li.page-item button")
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.Select(b => b.TextContent.Trim())
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.Where(t => int.TryParse(t, out _))
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.ToList();
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// First and last page are always reachable from the windowed pager.
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Assert.Contains("1", numbered);
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Assert.Contains("200", numbered);
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}
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}
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