Add code coverage for MultiPropertyDescriptorGridEntry

src/test/unit/System.Windows.Forms/System/Windows/Forms/MultiPropertyDescriptorGridEntryTests.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.ComponentModel;
+using System.Windows.Forms.PropertyGridInternal;
+using static System.Windows.Forms.PropertyGridInternal.GridEntry;
+
+namespace System.Windows.Forms.Tests;
+
+public class MultiPropertyDescriptorGridEntryTests
+{
+    private sealed class DummyComponent : Component { }
+    private sealed class TestGridEntry : GridEntry
+    {
+        public TestGridEntry(PropertyGrid ownerGrid)
+            : base(ownerGrid, null)
+        {
+        }
+    }
+
+    private static MultiPropertyDescriptorGridEntry CreateEntryWithObjects(object[] objects, PropertyDescriptor[] descriptors)
+    {
+        PropertyGrid ownerGrid = new();
+        TestGridEntry parent = new(ownerGrid);
+        bool hide = false;
+        return new MultiPropertyDescriptorGridEntry(ownerGrid, parent, objects, descriptors, hide);
+    }
+
+    [Fact]
+    public void Container_AllObjectsAreIComponentWithSameContainer_ReturnsContainer()
+    {
+        Container container = new();
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        container.Add(dummyComponent1);
+        container.Add(dummyComponent2);
+
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0], TypeDescriptor.GetProperties(dummyComponent2)[0]];
+        object[] objects = [dummyComponent1, dummyComponent2];
+
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        IContainer? result = multiPropertyDescriptorGridEntry.Container;
+
+        result.Should().BeSameAs(container);
+    }
+
+    [Fact]
+    public void Container_ObjectsAreIComponentWithDifferentContainers_ReturnsNull()
+    {
+        Container container1 = new();
+        Container container2 = new();
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        container1.Add(dummyComponent1);
+        container2.Add(dummyComponent2);
+
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0], TypeDescriptor.GetProperties(dummyComponent2)[0]];
+        object[] objects = [dummyComponent1, dummyComponent2];
+
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        IContainer? result = multiPropertyDescriptorGridEntry.Container;
+
+        result.Should().BeNull();
+    }
+
+    [Fact]
+    public void Container_ObjectsAreNotIComponent_ReturnsNull()
+    {
+        object[] objects = [new object(), new object()];
+        DummyComponent dummyComponent = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent)[0], TypeDescriptor.GetProperties(dummyComponent)[0]];
+
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        IContainer? result = multiPropertyDescriptorGridEntry.Container;
+
+        result.Should().BeNull();
+    }
+
+    [Fact]
+    public void Container_ObjectsAreIComponent_SomeWithoutSite_ReturnsNull()
+    {
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        Container container = new();
+        container.Add(dummyComponent1);
+
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0], TypeDescriptor.GetProperties(dummyComponent2)[0]];
+        object[] objects = [dummyComponent1, dummyComponent2];
+
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        IContainer? result = multiPropertyDescriptorGridEntry.Container;
+
+        result.Should().BeNull();
+    }
+
+    [Fact]
+    public void Container_EmptyObjects_ReturnsNull()
+    {
+        object[] objects = [];
+        DummyComponent dummyComponent = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent)[0]];
+
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        IContainer? result = multiPropertyDescriptorGridEntry.Container;
+
+        result.Should().BeNull();
+    }
+
+    [Fact]
+    public void Expandable_FlagExpandableAndHasChildren_ReturnsTrue()
+    {
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0], TypeDescriptor.GetProperties(dummyComponent2)[0]];
+        object[] objects = [dummyComponent1, dummyComponent2];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        multiPropertyDescriptorGridEntry.TestAccessor().Dynamic.SetFlag(Flags.Expandable, true);
+
+        PropertyGrid ownerGrid = new();
+        multiPropertyDescriptorGridEntry.TestAccessor().Dynamic.ChildCollection.Add(new TestGridEntry(ownerGrid));
+
+        bool result = multiPropertyDescriptorGridEntry.Expandable;
+
+        result.Should().BeTrue();
+    }
+
+    [Fact]
+    public void Expandable_ExpandableFailedFlag_ReturnsFalse()
+    {
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0], TypeDescriptor.GetProperties(dummyComponent2)[0]];
+        object[] objects = [dummyComponent1, dummyComponent2];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        multiPropertyDescriptorGridEntry.TestAccessor().Dynamic.SetFlag(Flags.ExpandableFailed, true);
+
+        bool result = multiPropertyDescriptorGridEntry.Expandable;
+
+        result.Should().BeFalse();
+    }
+
+    [Fact]
+    public void GetComponents_ReturnsCopyOfObjects()
+    {
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0], TypeDescriptor.GetProperties(dummyComponent2)[0]];
+        object[] objects = [dummyComponent1, dummyComponent2];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        IComponent[] result = multiPropertyDescriptorGridEntry.GetComponents();
+
+        result.Should().HaveCount(2);
+        result[0].Should().BeSameAs(dummyComponent1);
+        result[1].Should().BeSameAs(dummyComponent2);
+    }
+
+    [Fact]
+    public void GetPropertyTextValue_ValueIsNullAndMergedDescriptorReturnsNull_ReturnsEmptyString()
+    {
+        DummyComponent dummyComponent1 = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0]];
+        object[] objects = [dummyComponent1];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        string result = multiPropertyDescriptorGridEntry.GetPropertyTextValue(null);
+
+        result.Should().Be("(none)");
+    }
+
+    [Fact]
+    public void SendNotification_GridEntry_CreatesTransactionAndCommits()
+    {
+        DummyComponent dummyComponent1 = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0]];
+        object[] objects = [dummyComponent1];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        GridEntry entryParam = new TestGridEntry(new PropertyGrid());
+
+        bool result = multiPropertyDescriptorGridEntry.SendNotification(entryParam, Notify.Reset);
+
+        result.Should().BeFalse();
+    }
+
+    [Fact]
+    public void NotifyParentsOfChanges_NotifiesParentProperties()
+    {
+        DummyComponent dummyComponent1 = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0]];
+        object[] objects = [dummyComponent1];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        multiPropertyDescriptorGridEntry.TestAccessor().Dynamic.NotifyParentsOfChanges(multiPropertyDescriptorGridEntry);
+    }
+
+    [Fact]
+    public void SendNotification_GridEntry_HandlesResetAndDoubleClick()
+    {
+        DummyComponent dummyComponent1 = new();
+        PropertyDescriptor[] propertyDescriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0]];
+        object[] objects = [dummyComponent1];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        TestGridEntry gridEntry = new(new PropertyGrid());
+
+        bool resultReset = multiPropertyDescriptorGridEntry.SendNotification(gridEntry, Notify.Reset);
+        bool resultDoubleClick = multiPropertyDescriptorGridEntry.SendNotification(gridEntry, Notify.DoubleClick);
+
+        resultReset.Should().BeFalse();
+        resultDoubleClick.Should().BeFalse();
+    }
+
+    [Fact]
+    public void OwnersEqual_ComparesOwnersCorrectly()
+    {
+        object o1 = new();
+        object o2 = new();
+
+        var accessor = typeof(MultiPropertyDescriptorGridEntry).TestAccessor();
+        bool result1 = accessor.Dynamic.OwnersEqual(o1, o1);
+        bool result2 = accessor.Dynamic.OwnersEqual(new[] { o1, o2 }, new[] { o1, o2 });
+        bool result3 = accessor.Dynamic.OwnersEqual(new[] { o1 }, new[] { o2 });
+
+        result1.Should().BeTrue();
+        result2.Should().BeTrue();
+        result3.Should().BeFalse();
+    }
+
+    [Fact]
+    public void OnComponentChanging_CallsChangeServiceForEachObject()
+    {
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        PropertyDescriptor[] descriptors = [TypeDescriptor.GetProperties(dummyComponent1)[0], TypeDescriptor.GetProperties(dummyComponent2)[0]];
+        object[] objects = [dummyComponent1, dummyComponent2];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, descriptors);
+
+        bool result = multiPropertyDescriptorGridEntry.OnComponentChanging();
+
+        result.Should().BeTrue();
+    }
+
+    [Fact]
+    public void OnComponentChanged_DoesNothing_WhenServiceIsNull()
+    {
+        DummyComponent dummyComponent1 = new();
+        DummyComponent dummyComponent2 = new();
+        PropertyDescriptor[] propertyDescriptors =
+        [
+            TypeDescriptor.GetProperties(dummyComponent1)[0],
+            TypeDescriptor.GetProperties(dummyComponent2)[0]
+        ];
+        object[] objects = [dummyComponent1, dummyComponent2];
+        MultiPropertyDescriptorGridEntry multiPropertyDescriptorGridEntry = CreateEntryWithObjects(objects, propertyDescriptors);
+
+        multiPropertyDescriptorGridEntry.Invoking(e => e.OnComponentChanged()).Should().NotThrow();
+    }
+}