Fix tests

src/Compilers/CSharp/Test/Syntax/IncrementalParsing/BinaryExpression.cs

@@ -204,8 +204,8 @@ private static ExpressionSyntax GetExpressionNode(SyntaxTree newTree)
         private static ExpressionSyntax GetGlobalExpressionNode(SyntaxTree newTree)
         {
             var statementType = newTree.GetCompilationUnitRoot().Members[0] as GlobalStatementSyntax;
-            Assert.Null(statementType.AttributeLists);
-            Assert.Null(statementType.Modifiers);
+            Assert.True(statementType.AttributeLists.Count == 0);
+            Assert.True(statementType.Modifiers.Count == 0);
             var statement = statementType.Statement as ExpressionStatementSyntax;
             return statement.Expression;
         }

src/Compilers/CSharp/Test/Syntax/IncrementalParsing/CompoundAssignment.cs

@@ -142,8 +142,8 @@ private static AssignmentExpressionSyntax GetExpressionSyntaxChange(SyntaxTree n
         private static AssignmentExpressionSyntax GetGlobalStatementSyntaxChange(SyntaxTree newTree)
         {
             var statementType = newTree.GetCompilationUnitRoot().Members[0] as GlobalStatementSyntax;
-            Assert.Null(statementType.AttributeLists);
-            Assert.Null(statementType.Modifiers);
+            Assert.True(statementType.AttributeLists.Count == 0);
+            Assert.True(statementType.Modifiers.Count == 0);
             var statement = statementType.Statement as ExpressionStatementSyntax;
             var expression = statement.Expression as AssignmentExpressionSyntax;
             return expression;

src/Compilers/CSharp/Test/Syntax/IncrementalParsing/UnaryExpression.cs

@@ -93,8 +93,8 @@ private static PrefixUnaryExpressionSyntax GetExpressionNode(SyntaxTree newTree)
         private static PrefixUnaryExpressionSyntax GetGlobalExpressionNode(SyntaxTree newTree)
         {
             var statementType = newTree.GetCompilationUnitRoot().Members[0] as GlobalStatementSyntax;
-            Assert.Null(statementType.AttributeLists);
-            Assert.Null(statementType.Modifiers);
+            Assert.True(statementType.AttributeLists.Count == 0);
+            Assert.True(statementType.Modifiers.Count == 0);
             var statement = statementType.Statement as ExpressionStatementSyntax;
             var expression = statement.Expression as PrefixUnaryExpressionSyntax;
             return expression;