WIP

UnitTests/View/Navigation/SetFocusTests.cs

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+using Xunit.Abstractions;
+
+namespace Terminal.Gui.ViewTests;
+
+public class SetFocusTests (ITestOutputHelper _output) : TestsAllViews
+{
+   
+    [Fact]
+    public void SetFocus_With_Null_Superview_Does_Not_Throw_Exception ()
+    {
+        var view = new View ()
+        {
+            Id = "view",
+            CanFocus = true
+        };
+        Assert.True (view.CanFocus);
+        Assert.False (view.HasFocus);
+
+        Exception exception = Record.Exception (() => view.SetFocus ());
+        Assert.Null (exception);
+
+        Assert.True (view.CanFocus);
+        Assert.True (view.HasFocus);
+    }
+
+    [Fact]
+    public void SetFocus_SetsFocus ()
+    {
+        var view = new View ()
+        {
+            Id = "view",
+            CanFocus = true
+        };
+        Assert.True (view.CanFocus);
+        Assert.False (view.HasFocus);
+
+        view.SetFocus ();
+        Assert.True (view.HasFocus);
+    }
+
+    [Fact]
+    public void SetFocus_NoSubView_Focused_Is_Null ()
+    {
+        var view = new View ()
+        {
+            Id = "view",
+            CanFocus = true
+        };
+        Assert.True (view.CanFocus);
+        Assert.False (view.HasFocus);
+
+        view.SetFocus ();
+        Assert.True (view.HasFocus);
+        Assert.Null (view.GetFocused ());
+    }
+
+    [Fact]
+    public void SetFocus_SubView_Focused_Is_Set ()
+    {
+        var view = new View ()
+        {
+            Id = "view",
+            CanFocus = true
+        };
+
+        var subview = new View ()
+        {
+            Id = "subview",
+            CanFocus = true
+        };
+        view.Add (subview);
+        Assert.True (view.CanFocus);
+        Assert.False (view.HasFocus);
+
+        view.SetFocus ();
+        Assert.True (view.HasFocus);
+        Assert.Equal (subview, view.GetFocused ());
+    }
+
+    [Fact]
+    public void SetFocus_SetsFocus_DeepestSubView ()
+    {
+        var view = new View ()
+        {
+            Id = "view",
+            CanFocus = true
+        };
+
+        var subview = new View ()
+        {
+            Id = "subview",
+            CanFocus = true
+        };
+        view.Add (subview);
+
+        view.SetFocus ();
+        Assert.True (subview.HasFocus);
+        Assert.Equal (subview, view.GetFocused ());
+    }
+
+    [Fact]
+    public void SetFocus_SetsFocus_DeepestSubView_CompoundSubView ()
+    {
+        var view = new View ()
+        {
+            Id = "view",
+            CanFocus = true
+        };
+
+        var subView = new View ()
+        {
+            Id = "subView",
+            CanFocus = true
+        };
+
+        var subViewSubView1 = new View ()
+        {
+            Id = "subViewSubView1",
+            CanFocus = false
+        };
+
+        var subViewSubView2 = new View ()
+        {
+            Id = "subViewSubView2",
+            CanFocus = true
+        };
+        var subViewSubView3 = new View ()
+        {
+            Id = "subViewSubView3",
+            CanFocus = false
+        };
+        subView.Add (subViewSubView1, subViewSubView2, subViewSubView3);
+
+        view.Add (subView);
+
+        view.SetFocus ();
+        Assert.True (subView.HasFocus);
+        Assert.Equal (subView, view.GetFocused ());
+        Assert.Equal (subViewSubView2, subView.GetFocused ());
+    }
+
+    [Fact]
+    public void SetFocus_Peer_LeavesOther ()
+    {
+        var view = new View ()
+        {
+            Id = "view",
+            CanFocus = true
+        };
+
+        var subview1 = new View ()
+        {
+            Id = "subview1",
+            CanFocus = true
+        };
+
+        var subview2 = new View ()
+        {
+            Id = "subview2",
+            CanFocus = true
+        };
+        view.Add (subview1, subview2);
+
+        view.SetFocus ();
+        Assert.Equal (subview1, view.GetFocused ());
+        Assert.True (subview1.HasFocus);
+        Assert.False (subview2.HasFocus);
+
+        subview2.SetFocus ();
+        Assert.Equal (subview2, view.GetFocused ());
+        Assert.True (subview2.HasFocus);
+        Assert.False (subview1.HasFocus);
+    }
+
+    [Fact]
+    public void SetFocus_Peer_LeavesOthers_Subviews ()
+    {
+        var top = new View
+        {
+            Id = "top",
+            CanFocus = true
+        };
+        var view1 = new View
+        {
+            Id = "view1",
+            CanFocus = true
+        };
+
+        var subView1 = new View
+        {
+            Id = "subView1",
+            CanFocus = true
+        };
+
+        view1.Add (subView1);
+
+        var subView1SubView1 = new View
+        {
+            Id = "subView1subView1",
+            CanFocus = true
+        };
+
+        subView1.Add (subView1SubView1);
+
+        var view2 = new View
+        {
+            Id = "view2",
+            CanFocus = true
+        };
+
+        top.Add (view1, view2);
+        Assert.False (view1.HasFocus);
+        Assert.False (view2.HasFocus);
+
+        view1.SetFocus ();
+        Assert.True (view1.HasFocus);
+        Assert.True (subView1.HasFocus);
+        Assert.True (subView1SubView1.HasFocus);
+        Assert.Equal (subView1, view1.GetFocused ());
+        Assert.Equal (subView1SubView1, subView1.GetFocused ());
+
+        view2.SetFocus ();
+        Assert.False (view1.HasFocus);
+        Assert.True (view2.HasFocus);
+    }
+}