Adding test for issue icsharpcode#1157 for assignment operators of parameterized properties

Author: gaschd

Tests/CSharp/MemberTests/PropertyMemberTests.cs

@@ -479,6 +479,92 @@ public int this[double index]
 }");
     }
 
+    [Fact]
+    public async Task TestParameterizedPropertyAssignmentOperatorsAsync()
+    {
+        await TestConversionVisualBasicToCSharpAsync(@"
+Public Class TestClass
+    Private _items As Integer() = New Integer() {1}
+    Public Property Item(index As Integer) As Integer
+        Get
+            Return _items(index)
+        End Get
+        Set(value As Integer)
+            _items(index) = value
+        End Set
+    End Property
+
+    Private _strItems As String() = New String() {""Hello""}
+    Public Property StrItem(index As Integer) As String
+        Get
+            Return _strItems(index)
+        End Get
+        Set(value As String)
+            _strItems(index) = value
+        End Set
+    End Property
+
+    Public Sub AllAssignmentOperators()
+        Item(0) += 2        
+        Item(0) *= 2         
+        Item(0) ^= 2     
+        Item(0) /= 2        
+        Item(0) -= 2        
+        Item(0) \= 2        
+        Item(0) <<= 2
+        Item(0) >>= 2
+        StrItem(0) &= "" World""
+
+        Item(0) = Item(0) + 2        
+        Item(0) = Item(0) * 2         
+        Item(0) = Item(0) ^ 2     
+        Item(0) = Item(0) / 2        
+        Item(0) = Item(0) - 2        
+        Item(0) = Item(0) \ 2        
+        Item(0) = Item(0) << 2
+        Item(0) = Item(0) >> 2
+        StrItem(0) = StrItem(0) & "" World""
+    End Sub
+End Class", @"
+using System;
+              
+public partial class TestClass
+{
+    private int[] _items = new int[] { 1 };
+    public int get_Item(int index)
+    {
+        return _items[index];
+    }
+    public void set_Item(int index, int value)
+    {
+        _items[index] = value;
+    }
+              
+    private string[] _strItems = new string[] { ""Hello"" };
+    public string get_StrItem(int index)
+    {
+        return _strItems[index];
+    }
+    public void set_StrItem(int index, string value)
+    {
+        _strItems[index] = value;
+    }
+              
+    public void AllAssignmentOperators()
+    {   
+        set_Item(0, get_Item(0) + 2);
+        set_Item(0, get_Item(0) * 2);
+        set_Item(0, (int)Math.Round(Math.Pow(get_Item(0), 2d)));
+        set_Item(0, (int)Math.Round(get_Item(0) / 2d));
+        set_Item(0, get_Item(0) - 2);
+        set_Item(0, get_Item(0) / 2);
+        set_Item(0, get_Item(0) << 2);
+        set_Item(0, get_Item(0) >> 2);
+        set_StrItem(0, get_StrItem(0) + "" World"");
+    }
+}");
+    }
+
     [Fact]
     public async Task TestWriteOnlyPropertiesAsync()
     {