Update SA1519 for asynchronous streams

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp8/LayoutRules/SA1519CSharp8UnitTests.cs

@@ -3,9 +3,52 @@
 
 namespace StyleCop.Analyzers.Test.CSharp8.LayoutRules
 {
+    using System.Threading;
+    using System.Threading.Tasks;
     using StyleCop.Analyzers.Test.CSharp7.LayoutRules;
+    using Xunit;
+    using static StyleCop.Analyzers.Test.Verifiers.StyleCopCodeFixVerifier<
+        StyleCop.Analyzers.LayoutRules.SA1519BracesMustNotBeOmittedFromMultiLineChildStatement,
+        StyleCop.Analyzers.LayoutRules.SA1503CodeFixProvider>;
 
     public partial class SA1519CSharp8UnitTests : SA1519CSharp7UnitTests
     {
+        [Fact]
+        [WorkItem(3007, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3007")]
+        public async Task TestAwaitForEachMultiLineChildRequiresBracesAsync()
+        {
+            var testCode = @"
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+public class TestClass
+{
+    public async Task TestAsync(IAsyncEnumerable<int> values)
+    {
+        await foreach (var value in values)
+            {|#0:System.Console.WriteLine(
+                value);|}
+    }
+}
+";
+            var fixedCode = @"
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+public class TestClass
+{
+    public async Task TestAsync(IAsyncEnumerable<int> values)
+    {
+        await foreach (var value in values)
+        {
+            System.Console.WriteLine(
+                value);
+        }
+    }
+}
+";
+
+            await VerifyCSharpFixAsync(testCode, Diagnostic().WithLocation(0), fixedCode, CancellationToken.None).ConfigureAwait(false);
+        }
     }
 }