Fixes #721 (#282)

- Ensure minimum of 2 newlines after GO statement
- All existing unit tests are passing, indicating this is respecting scenarios where users have comment lines after GO statements (this happens in many other tests)

src/Microsoft.SqlTools.ServiceLayer/Formatter/Impl/FormatterUtilities.cs

@@ -30,7 +30,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Formatter
             return NormalizeNewLinesInWhitespace(original, context, 1);
         }
 
-        private static string NormalizeNewLinesInWhitespace(string original, FormatContext context, int minimumNewLines)
+        internal static string NormalizeNewLinesInWhitespace(string original, FormatContext context, int minimumNewLines)
         {
             return NormalizeNewLinesInWhitespace(original, context, 1, () => { return original; });
         }

src/Microsoft.SqlTools.ServiceLayer/Formatter/Impl/SqlBatchFormatter.cs

@@ -28,7 +28,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Formatter
         {
             for (int i = startTokenNumber; i < firstChildStartTokenNumber; i++)
             {
-                SimpleProcessToken(i, FormatterUtilities.NormalizeNewLinesEnsureOneNewLineMinimum);
+                SimpleProcessToken(i, (original, context) => FormatterUtilities.NormalizeNewLinesInWhitespace(original, context, 2));
             }
         }
 

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/TSqlFormatter/BaselineFiles/Go_NewlineHandling.sql

@@ -0,0 +1,11 @@
+use WideWorldImporters;
+go
+
+alter database current collate Latin1_General_100_CI_AS;
+go
+
+alter database current set RECOVERY SIMPLE;
+go
+
+alter database current set AUTO_UPDATE_STATISTICS_ASYNC on;
+go

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/TSqlFormatter/TestFiles/Go.sql

@@ -0,0 +1,11 @@
+USE WideWorldImporters;
+GO
+ 
+ALTER DATABASE CURRENT COLLATE Latin1_General_100_CI_AS;
+GO
+ 
+ALTER DATABASE CURRENT SET RECOVERY SIMPLE;
+GO
+ 
+ALTER DATABASE CURRENT SET AUTO_UPDATE_STATISTICS_ASYNC ON;
+GO

test/Microsoft.SqlTools.ServiceLayer.UnitTests/Formatter/GeneralFormatterTests.cs

@@ -10,6 +10,20 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.Formatter
 {
     public class GeneralFormatterTests : FormatterUnitTestsBase
     {
+        [Fact]
+        public void GoNewLineShouldBePreserved()
+        {
+            LoadAndFormatAndCompare("GoNewLineShouldBePreserved", 
+                GetInputFile("Go.sql"),
+                GetBaselineFile("Go_NewlineHandling.sql"), 
+                new FormatOptions() { 
+                    KeywordCasing = CasingOptions.Lowercase,
+                    DatatypeCasing = CasingOptions.Uppercase,
+                    PlaceEachReferenceOnNewLineInQueryStatements = true
+                }, 
+                verifyFormat: true);
+        }
+
         [Fact]
         public void KeywordCaseConversionUppercase()
         {