Add tests for PaginatinState and TotalItemCountChangedEventArgs

src/Core/Microsoft.FluentUI.AspNetCore.Components.csproj

@@ -117,4 +117,7 @@
       <NoWarn>CS1591</NoWarn>
     </EmbeddedResource>
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Components\DataGrid\" />
+  </ItemGroup>
 </Project>

tests/Core/Components/Paginator/FluentPaginatorTests.FluentPaginator_SetItemsPerPage.verified.razor.html

@@ -0,0 +1,29 @@
+
+<div class="fluent-paginator">
+  <div class="summary">
+    <strong>20</strong>
+    items</div>
+  <nav role="navigation" class="paginator-nav">
+    <fluent-button icon-only="" disabled="" title="Go to first page" blazor:onclick="x" aria-label="Go to first page">
+      <svg style="width: 20px;" focusable="false" viewBox="0 0 20 20" aria-hidden="true" blazor:onkeydown="x" blazor:onclick="x">
+        <path d="M11.35 15.85a.5.5 0 0 1-.7 0L5.16 10.4a.55.55 0 0 1 0-.78l5.49-5.46a.5.5 0 1 1 .7.7L6.2 10l5.16 5.15c.2.2.2.5 0 .7Zm4 0a.5.5 0 0 1-.7 0L9.16 10.4a.55.55 0 0 1 0-.78l5.49-5.46a.5.5 0 1 1 .7.7L10.2 10l5.16 5.15c.2.2.2.5 0 .7Z"></path>
+      </svg>
+    </fluent-button>
+    <fluent-button icon-only="" disabled="" title="Go to previous page" blazor:onclick="x" aria-label="Go to previous page">
+      <svg style="width: 20px;" focusable="false" viewBox="0 0 20 20" aria-hidden="true" blazor:onkeydown="x" blazor:onclick="x">
+        <path d="M12.35 15.85a.5.5 0 0 1-.7 0L6.16 10.4a.55.55 0 0 1 0-.78l5.49-5.46a.5.5 0 1 1 .7.7L7.2 10l5.16 5.15c.2.2.2.5 0 .7Z"></path>
+      </svg>
+    </fluent-button>
+    <div class="pagination-text">Page 1 of 4</div>
+    <fluent-button icon-only="" title="Go to next page" blazor:onclick="x" aria-label="Go to next page">
+      <svg style="width: 20px;" focusable="false" viewBox="0 0 20 20" aria-hidden="true" blazor:onkeydown="x" blazor:onclick="x">
+        <path d="M7.65 4.15c.2-.2.5-.2.7 0l5.49 5.46c.21.22.21.57 0 .78l-5.49 5.46a.5.5 0 0 1-.7-.7L12.8 10 7.65 4.85a.5.5 0 0 1 0-.7Z"></path>
+      </svg>
+    </fluent-button>
+    <fluent-button icon-only="" title="Go to last page" blazor:onclick="x" aria-label="Go to last page">
+      <svg style="width: 20px;" focusable="false" viewBox="0 0 20 20" aria-hidden="true" blazor:onkeydown="x" blazor:onclick="x">
+        <path d="M8.65 4.15c.2-.2.5-.2.7 0l5.49 5.46c.21.22.21.57 0 .78l-5.49 5.46a.5.5 0 0 1-.7-.7L13.8 10 8.65 4.85a.5.5 0 0 1 0-.7Zm-4 0c.2-.2.5-.2.7 0l5.49 5.46c.21.22.21.57 0 .78l-5.49 5.46a.5.5 0 0 1-.7-.7L9.8 10 4.65 4.85a.5.5 0 0 1 0-.7Z"></path>
+      </svg>
+    </fluent-button>
+  </nav>
+</div>

tests/Core/Components/Paginator/FluentPaginatorTests.razor

@@ -29,6 +29,44 @@
         Assert.Contains("100", cut.Find(".summary").InnerHtml);
     }
 
+    [Fact]
+    public async Task FluentPaginator_SetItemsPerPage()
+    {
+        // Arrange
+        var state = new PaginationState();
+        await state.SetTotalItemCountAsync(20);
+        await state.SetItemsPerPageAsync(5);
+
+        // Act
+        var cut = Render(@<FluentPaginator State="@state" />);
+
+        // Assert
+        cut.Verify();
+        Assert.NotNull(cut.Find(".fluent-paginator"));
+        Assert.NotNull(cut.Find(".summary"));
+        Assert.NotNull(cut.Find(".paginator-nav"));
+        Assert.Contains("20", cut.Find(".summary").InnerHtml);
+    }
+
+    [Fact]
+    public async Task FluentPaginator_CurrentPageBeyondLastPage()
+    {
+        // Arrange
+        var state = new PaginationState();
+        await state.SetCurrentPageIndexAsync(12);
+        await state.SetTotalItemCountAsync(100);
+
+        // Act
+        var cut = Render(@<FluentPaginator State="@state" />);
+
+        // Assert
+
+        Assert.NotNull(cut.Find(".fluent-paginator"));
+        Assert.NotNull(cut.Find(".summary"));
+        Assert.NotNull(cut.Find(".paginator-nav"));
+        Assert.Contains("100", cut.Find(".summary").InnerHtml);
+    }
+
     [Fact]
     public void FluentPaginator_DoesNotRender_WhenTotalItemCountIsNull()
     {

tests/Core/Components/Paginator/PaginationStateTest.cs

@@ -0,0 +1,46 @@
+// ------------------------------------------------------------------------
+// MIT License - Copyright (c) Microsoft Corporation. All rights reserved.
+// ------------------------------------------------------------------------
+
+using Xunit;
+
+namespace Microsoft.FluentUI.AspNetCore.Components.Tests.Components.Paginator;
+public class PaginationStateTest : Bunit.TestContext
+{
+    [Fact]
+    public async Task PaginationState_GetHashCode_ReturnsExpectedAsync()
+    {
+        // Arrange
+        var paginationState = new PaginationState();
+        paginationState.ItemsPerPage = 20;
+
+        await paginationState.SetTotalItemCountAsync(100);
+        await paginationState.SetItemsPerPageAsync(20);
+        await paginationState.SetCurrentPageIndexAsync(2);
+
+        // Act
+        var hashCode = paginationState.GetHashCode();
+
+        // Assert
+        Assert.NotEqual(0, hashCode);
+    }
+    [Fact]
+    public async Task SetTotalItemCountAsync_UpdatesTotalItemCountAndKeepsCurrentPageIndexValid()
+    {
+        // Arrange
+        var paginationState = new PaginationState();
+        paginationState.ItemsPerPage = 10;
+        await paginationState.SetItemsPerPageAsync(10);
+        await paginationState.SetCurrentPageIndexAsync(3);
+
+        // Act
+        await paginationState.SetTotalItemCountAsync(25, force: true);
+        await paginationState.SetTotalItemCountAsync(25, force: false);
+
+        // Assert
+        Assert.Equal(25, paginationState.TotalItemCount);
+        // With 10 items per page and 25 items, there are 3 pages (0,1,2)
+        // So current page index should be adjusted to 2 if it was set to 3
+        Assert.Equal(2, paginationState.CurrentPageIndex);
+    }
+}

tests/Core/Components/Paginator/TotalItemCountChangedEventArgsTest.cs

@@ -0,0 +1,33 @@
+// ------------------------------------------------------------------------
+// MIT License - Copyright (c) Microsoft Corporation. All rights reserved.
+// ------------------------------------------------------------------------
+
+using Xunit;
+
+namespace Microsoft.FluentUI.AspNetCore.Components.Tests.Components.Paginator;
+
+public class TotalItemCountChangedEventArgsTest
+{
+    [Fact]
+    public void Constructor_SetsTotalItemCount()
+    {
+        // Arrange
+        int? expectedCount = 42;
+
+        // Act
+        var args = new TotalItemCountChangedEventArgs(expectedCount);
+
+        // Assert
+        Assert.Equal(expectedCount, args.TotalItemCount);
+    }
+
+    [Fact]
+    public void Constructor_AllowsNullTotalItemCount()
+    {
+        // Act
+        var args = new TotalItemCountChangedEventArgs(null);
+
+        // Assert
+        Assert.Null(args.TotalItemCount);
+    }
+}