Update SA1000 for asynchronous streams

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp8/SpacingRules/SA1000CSharp8UnitTests.cs

@@ -3,9 +3,42 @@
 
 namespace StyleCop.Analyzers.Test.CSharp8.SpacingRules
 {
+    using System.Threading.Tasks;
+    using Microsoft.CodeAnalysis.Testing;
     using StyleCop.Analyzers.Test.CSharp7.SpacingRules;
+    using Xunit;
+    using static StyleCop.Analyzers.Test.Verifiers.StyleCopCodeFixVerifier<
+        StyleCop.Analyzers.SpacingRules.SA1000KeywordsMustBeSpacedCorrectly,
+        StyleCop.Analyzers.SpacingRules.TokenSpacingCodeFixProvider>;
 
     public partial class SA1000CSharp8UnitTests : SA1000CSharp7UnitTests
     {
+        [Fact]
+        [WorkItem(3007, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3007")]
+        public async Task TestAwaitForEachMissingSpaceAsync()
+        {
+            string statementWithoutSpace = @"await {|#0:foreach|}(var value in GetValues())
+{
+    _ = value;
+}
+
+async IAsyncEnumerable<int> GetValues()
+{
+    yield return 1;
+}";
+            string statementWithSpace = @"await foreach (var value in GetValues())
+{
+    _ = value;
+}
+
+async IAsyncEnumerable<int> GetValues()
+{
+    yield return 1;
+}";
+
+            DiagnosticResult expected = Diagnostic().WithArguments("foreach", string.Empty, "followed").WithLocation(0);
+
+            await this.TestKeywordStatementAsync(statementWithoutSpace, expected, statementWithSpace, returnType: "Task", asyncMethod: true).ConfigureAwait(false);
+        }
     }
 }