Add test for IAsyncEnumerable<string>

src/EditorFeatures/CSharpTest/Diagnostics/GenerateMethod/GenerateMethodTests.cs

@@ -2621,6 +2621,42 @@ interface ISomeInterface
 " + IAsyncEnumerable);
         }
 
+        [WorkItem(48064, "https://github.com/dotnet/roslyn/issues/48064")]
+        [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsGenerateMethod)]
+        public async Task TestInvocationWithinAsynchronousForEach_IAsyncEnumerableExists_UseIAsyncEnumerableOfString()
+        {
+            await TestInRegularAndScriptAsync(
+@"class C
+{
+    async void M(ISomeInterface _someInterface)
+    {
+         await foreach (string item in _someInterface.[|GetItems|]())
+         {
+         }
+    }
+}
+
+interface ISomeInterface
+{
+}
+" + IAsyncEnumerable,
+@"class C
+{
+    async void M(ISomeInterface _someInterface)
+    {
+         await foreach (string item in _someInterface.GetItems())
+         {
+         }
+    }
+}
+
+interface ISomeInterface
+{
+    System.Collections.Generic.IAsyncEnumerable<string> GetItems();
+}
+" + IAsyncEnumerable);
+        }
+
         [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsGenerateMethod)]
         public async Task TestInvocationOffOfAnotherMethodCall()
         {