Add missing tests of BitButtonGroup component (#11646)

src/BlazorUI/Bit.BlazorUI.Tests/Components/Buttons/BitButtonGroupTests.cs

@@ -0,0 +1,91 @@
+using System.Collections.Generic;
+using Bunit;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Bit.BlazorUI.Tests.Components.Buttons.ButtonGroup;
+
+[TestClass]
+public class BitButtonGroupTests : BunitTestContext
+{
+    [TestMethod]
+    public void BitButtonGroupShouldRenderItemsFromItemsParameter()
+    {
+        var items = new List<BitButtonGroupItem>
+        {
+            new() { Text = "One" },
+            new() { Text = "Two" }
+        };
+
+        var comp = RenderComponent<BitButtonGroup<BitButtonGroupItem>>(parameters =>
+        {
+            parameters.Add(p => p.Items, items);
+        });
+
+        var buttons = comp.FindAll("button");
+        Assert.AreEqual(2, buttons.Count);
+        Assert.IsTrue(buttons[0].TextContent.Contains("One"));
+        Assert.IsTrue(buttons[1].TextContent.Contains("Two"));
+    }
+
+    [TestMethod]
+    public void BitButtonGroupShouldInvokeOnItemClickAndItemOnClickAction()
+    {
+        var actionInvokedText = string.Empty;
+        var onItemClickCalled = false;
+
+        var items = new List<BitButtonGroupItem>
+        {
+            new() { Text = "ClickMe", OnClick = i => actionInvokedText = i.Text },
+            new() { Text = "Other" }
+        };
+
+        var component = RenderComponent<BitButtonGroup<BitButtonGroupItem>>(parameters =>
+        {
+            parameters.Add(p => p.Items, items);
+            parameters.Add(p => p.OnItemClick, (BitButtonGroupItem it) => onItemClickCalled = true);
+        });
+
+        var btn = component.Find(".bit-btg-itm");
+        Assert.IsNotNull(btn);
+
+        btn.Click();
+
+        Assert.IsTrue(onItemClickCalled);
+        Assert.AreEqual("ClickMe", actionInvokedText);
+    }
+
+    [TestMethod]
+    public void BitButtonGroupToggleDefaultKeyShouldSetToggledItemAndRaiseOnToggleChange()
+    {
+        string? toggledKey = null;
+
+        var items = new List<BitButtonGroupItem>
+        {
+            new() { Text = "A", Key = "a" },
+            new() { Text = "B", Key = "b" }
+        };
+
+        var comp = RenderComponent<BitButtonGroup<BitButtonGroupItem>>(parameters =>
+        {
+            parameters.Add(p => p.Items, items);
+            parameters.Add(p => p.Toggle, true);
+            parameters.Add(p => p.DefaultToggleKey, "b");
+            parameters.Add(p => p.OnToggleChange, (BitButtonGroupItem it) => toggledKey = it?.Key);
+        });
+
+        // After initialization the default toggled item should be applied
+        Assert.AreEqual("b", toggledKey);
+
+        // The rendered button with toggled class
+        var toggled = comp.FindAll(".bit-btg-chk");
+        Assert.IsTrue(toggled.Count >= 1);
+        Assert.IsTrue(toggled[0].TextContent.Contains("B"));
+
+        // Click the first button to toggle
+        var firstBtn = comp.FindAll("button")[0];
+        firstBtn.Click();
+
+        // Now toggledKey should change to 'a'
+        Assert.AreEqual("a", toggledKey);
+    }
+}