Add test TestBeforeAssemblyAttribute

src/EditorFeatures/CSharpTest2/Recommendations/AssemblyKeywordRecommenderTests.cs

@@ -119,13 +119,24 @@ public async Task TestInOuterAttribute()
 
         [Fact, Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
         [WorkItem(362, "https://github.com/dotnet/roslyn/issues/362")]
-        public async Task TestOutOuterAttributeInNamespace()
+        public async Task TestBeforeAttributeNamespace()
         {
             await VerifyKeywordAsync(
 @"[$$
 namespace Goo {}");
         }
 
+        [Fact, Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
+        [WorkItem(362, "https://github.com/dotnet/roslyn/issues/362")]
+        public async Task TestBeforeAssemblyAttribute()
+        {
+            await VerifyKeywordAsync(
+@"
+[$$
+[assembly: Whatever]
+namespace Goo {}");
+        }
+
         [Fact, Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
         public async Task TestNotInOuterAttributeInNamespace()
         {

src/Features/CSharp/Portable/Completion/KeywordRecommenders/AssemblyKeywordRecommender.cs

@@ -17,7 +17,7 @@ public AssemblyKeywordRecommender()
 
         protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
         {
-            if (context.TargetToken.GetNextToken().Kind() == SyntaxKind.NamespaceKeyword || context.IsTypeAttributeContext(cancellationToken) )
+            if (context.TargetToken.IsBeforeNamespace()|| context.IsTypeAttributeContext(cancellationToken) )
             {
                 var token = context.LeftToken;
                 var type = token.GetAncestor<MemberDeclarationSyntax>();

src/Workspaces/CSharp/Portable/Extensions/ContextQuery/SyntaxTokenExtensions.cs

@@ -5,7 +5,6 @@
 using Microsoft.CodeAnalysis.CSharp.Symbols;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Shared.Extensions;
-using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery
 {
@@ -671,5 +670,13 @@ public static bool IsMandatoryNamedParameterPosition(this SyntaxToken token)
 
             return false;
         }
+
+        public static bool IsBeforeNamespace(this SyntaxToken token)
+        {
+            // cases:
+            // | namespace Goo
+            // | [N] namespace Goo
+            return token.GetNextToken().Kind() == SyntaxKind.NamespaceKeyword;
+        }
     }
 }