diff --git a/test/tcsyshelpers.pp b/test/tcsyshelpers.pp
new file mode 100644
index 0000000..106b559
--- /dev/null
+++ b/test/tcsyshelpers.pp
@@ -0,0 +1,1248 @@
+unit tcsyshelpers;
+
+{$mode objfpc}{$h+}
+
+interface
+
+uses
+  SysUtils, fpcunit, testregistry;
+
+Type
+
+  { TTestHelpers }
+
+  TTestHelpers = class(TTestCase)
+  private
+    procedure EqualGUID(Msg: String; Expected, Actual: TGUID);
+    procedure EqualGUIDSwap(Msg: String; Expected, Actual: TGUID);
+    procedure GetGUID(out G: TGUID);
+  Published
+//  Public
+    procedure TestGUIDHelperCreateUntypedData;
+    procedure TestGUIDHelperCreateUntypedDataEndian;
+    procedure TestGUIDHelperCreateInteger;
+    procedure TestGUIDHelperCreateIntegerBytes;
+    procedure TestGUIDHelperCreateNew;
+    procedure TestGUIDHelperCreateString;
+    procedure TestGUIDHelperCreateTBytes;
+    procedure TestGUIDHelperCreateTBytesAtIndex;
+    procedure TestGUIDHelperCreateWords;
+    procedure TestGUIDHelperToByteArray;
+    procedure TestGUIDHelperToString;
+    procedure TestByteHelper;
+    procedure TestCardinalHelper;
+    procedure TestLongintHelper;
+    procedure TestNegLongintHelper;
+    procedure TestNegShortIntHelper;
+    procedure TestNegSmallintHelper;
+    procedure TestShortIntHelper;
+    procedure TestSmallintHelper;
+    procedure TestWordHelper;
+    procedure TestIsNanDouble;
+    procedure TestByteClearBit;
+    procedure TestByteSetBit;
+    procedure TestByteTestBit;
+    procedure TestByteToggleBit;
+    procedure TestShortIntSetBit;
+    procedure TestShortIntToggleBit;
+    procedure TestCardinalClearBit;
+    procedure TestCardinalSetBit;
+    procedure TestCardinalTestBit;
+    procedure TestCardinalToggleBit;
+    procedure TestLongintClearBit;
+    procedure TestLongintSetBit;
+    procedure TestLongintTestBit;
+    procedure TestLongintToggleBit;
+    procedure TestShortIntClearBit;
+    procedure TestShortIntTestBit;
+    procedure TestSmallIntClearBit;
+    procedure TestSmallIntSetBit;
+    procedure TestSmallIntTestBit;
+    procedure TestSmallIntToggleBit;
+    procedure TestWordClearBit;
+    procedure TestWordSetBit;
+    procedure TestWordTestBit;
+    procedure TestWordToggleBit;
+    procedure TestNativeUintSetBit;
+    procedure TestNativeUIntToggleBit;
+    procedure TestNativeIntHelper;
+    procedure TestNativeUintHelper;
+    procedure TestNativeUIntTestBit;
+    procedure TestNativeIntClearBit;
+    procedure TestNativeIntSetBit;
+    procedure TestNativeIntToggleBit;
+    procedure TestNativeIntTestBit;
+  end;
+
+Implementation
+
+Procedure TTestHelpers.TestByteHelper;
+
+Const
+  Value               = 123;
+  ValueAsString       = '123';
+  ValueAsHex          = '7B';
+  ValueAsHexDig       = 4;
+  ValueAsHexDigString = '007B';
+
+Var
+  V : Byte;
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestShortIntHelper;
+
+Const
+  Value               = 123;
+  ValueAsString       = '123';
+  ValueAsHex          = '7B';
+  ValueAsHexDig       = 4;
+  ValueAsHexDigString = '007B';
+
+Var
+  V : ShortInt;
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestNegShortIntHelper;
+
+Const
+  Value               = -123;
+  ValueAsString       = '-123';
+  ValueAsHex          = '85';
+  ValueAsHexDig       = 4;
+  ValueAsHexDigString = 'FF85';
+
+Var
+  V : ShortInt;
+
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestWordHelper;
+
+Const
+  Value               = 1024;
+  ValueAsString       = '1024';
+  ValueAsHex          = '0400';
+  ValueAsHexDig       = 6;
+  ValueAsHexDigString = '000400';
+
+Var
+  V : Word;
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestSmallintHelper;
+
+Const
+  Value               = 1024;
+  ValueAsString       = '1024';
+  ValueAsHex          = '0400';
+  ValueAsHexDig       = 6;
+  ValueAsHexDigString = '000400';
+
+Var
+  V : Smallint;
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestNegSmallintHelper;
+
+Const
+  Value               = -1024;
+  ValueAsString       = '-1024';
+  ValueAsHex          = 'FC00';
+  ValueAsHexDig       = 6;
+  ValueAsHexDigString = 'FFFC00';
+
+Var
+  V : Smallint;
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestCardinalHelper;
+
+Const
+  Value               = 131072;
+  ValueAsString       = '131072';
+  ValueAsHex          = '00020000';
+  ValueAsHexDig       = 10;
+  ValueAsHexDigString = '0000020000';
+
+Var
+  V : Cardinal;
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestLongintHelper;
+
+Const
+  Value               = 131072;
+  ValueAsString       = '131072';
+  ValueAsHex          = '00020000';
+  ValueAsHexDig       = 10;
+  ValueAsHexDigString = '0000020000';
+
+Var
+  V : Longint;
+
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestNegLongintHelper;
+
+Const
+  Value               = -131072;
+  ValueAsString       = '-131072';
+  ValueAsHex          = 'FFFE0000';
+  ValueAsHexDig       = 10;
+  ValueAsHexDigString = '00FFFE0000';
+
+Var
+  V : Longint;
+begin
+  {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestNativeUintHelper;
+
+Const
+  Value               = 17179869184; // 2^34
+  ValueAsString       = '17179869184';
+  ValueAsHex          = '0000000400000000';
+  ValueAsHexDig       = 18;
+  ValueAsHexDigString = '000000000400000000';
+
+Var
+  V : NativeUInt;
+begin
+  Fail('Not implemented yet');
+ // {$i tohelper.inc}
+end;
+
+Procedure TTestHelpers.TestNativeIntHelper;
+
+Const
+  Value               = 17179869184; // 2^34
+  ValueAsString       = '17179869184';
+  ValueAsHex          = '0000000400000000';
+  ValueAsHexDig       = 18;
+  ValueAsHexDigString = '000000000400000000';
+
+Var
+  V : NativeInt;
+begin
+  Fail('Notimplemented');
+//  {$i tohelper.inc}
+end;
+
+
+Procedure TTestHelpers.GetGUID(out G : TGUID);
+
+Var
+  I : Integer;
+
+begin
+  G.D1:=$DDCCBBAA;
+  G.D2:=$EEFF;
+  G.D3:=$CAAC;
+  For I:=0 to 7 do
+   G.D4[i]:=(1 shl i) and $FF;
+end;
+
+Procedure TTestHelpers.EqualGUID(Msg : String;Expected,Actual : TGUID);
+
+Var
+  I : Integer;
+
+begin
+  AssertEquals(Msg+' D1 equal',Expected.D1,Actual.D1);
+  AssertEquals(Msg+' D2 equal',Expected.D2,Actual.D2);
+  AssertEquals(Msg+' D2 equal',Expected.D3,Actual.D3);
+  For I:=0 to 7 do
+   AssertEquals(Msg+' D4['+IntToStr(I)+'] equal',Expected.D4[i],Actual.D4[i]);
+end;
+
+Procedure TTestHelpers.EqualGUIDSwap(Msg : String;Expected,Actual : TGUID);
+
+Var
+  I : Integer;
+
+begin
+  AssertEquals(Msg+' D1 equal',SwapEndian(Expected.D1),Actual.D1);
+  AssertEquals(Msg+' D2 equal',SwapEndian(Expected.D2),Actual.D2);
+  AssertEquals(Msg+' D2 equal',SwapEndian(Expected.D3),Actual.D3);
+  For I:=0 to 7 do
+   AssertEquals(Msg+' D4['+IntToStr(I)+'] equal',Expected.D4[i],Actual.D4[i]);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateUntypedData;
+
+Var
+  Src,Dest : TGUID;
+
+begin
+  GetGUID(Src);
+  Dest:=TGUID.Create(Src, True);
+  if CPUEndian = TEndian.Big then
+    EqualGUID('BE CPU: Create(Data,True)',Src,Dest)
+  else
+    EqualGUIDSwap('LE CPU: Create(Data,True)',Src,Dest);
+  Dest:=TGUID.Create(Src, False);
+  if CPUEndian = TEndian.Big then
+    EqualGUIDSwap('BE CPU: Create(Data,False)',Src,Dest)
+  else
+    EqualGUID('LE CPU : Create(Data,False)',Src,Dest);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateUntypedDataEndian;
+
+Var
+  Src,Dest : TGUID;
+
+begin
+  GetGUID(Src);
+  Dest:=TGUID.Create(Src, True);
+  if CPUEndian = TEndian.Big then
+    EqualGUID('BE CPU: Create(Data,True)',Src,Dest)
+  else
+    EqualGUIDSwap('LE CPU: Create(Data,True)',Src,Dest);
+  Dest:=TGUID.Create(Src, False);
+  if CPUEndian = TEndian.Big then
+    EqualGUIDSwap('BE CPU: Create(Data,False)',Src,Dest)
+  else
+    EqualGUID('LE CPU : Create(Data,False)',Src,Dest);
+end;
+
+
+Procedure TTestHelpers.TestGUIDHelperCreateTBytes;
+
+Var
+  Src,Dest : TGUID;
+  SrcBytes : TBytes;
+  D,I : Cardinal;
+
+begin
+  GetGUID(Src);
+  SrcBytes:=[];
+  SetLength(SrcBytes,16);
+  D:=Src.D1;
+  SrcBytes[0]:=D shr 24;
+  SrcBytes[1]:=(D shr 16) and $FF;
+  SrcBytes[2]:=(D shr 8) and $FF;
+  SrcBytes[3]:=(D and $FF);
+  D:=Src.D2;
+  SrcBytes[4]:=(D shr 8) and $FF;
+  SrcBytes[5]:=(D and $FF);
+  D:=Src.D3;
+  SrcBytes[6]:=(D shr 8) and $FF;
+  SrcBytes[7]:=(D and $FF);
+  For I:=0 to 7 do
+   SrcBytes[8+i]:=Src.D4[i];
+  Dest:=TGUID.Create(SrcBytes, TEndian.Big);
+  if CPUEndian = TEndian.Big then
+    EqualGUID('BE CPU: Create(Data,True)',Src,Dest)
+  else
+    EqualGUIDSwap('LE CPU: Create(Data,True)',Src,Dest);
+  Dest:=TGUID.Create(SrcBytes, TEndian.Little);
+  if CPUEndian = TEndian.Big then
+    EqualGUIDSwap('BE CPU: Create(Data,False)',Src,Dest)
+  else
+    EqualGUID('LE CPU : Create(Data,False)',Src,Dest);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateTBytesAtIndex;
+
+Var
+  Src,Dest : TGUID;
+  SrcBytes : TBytes;
+  I,D : Cardinal;
+
+begin
+  GetGUID(Src);
+  SrcBytes:=[];
+  SetLength(SrcBytes,32);
+  D:=Src.D1;
+  SrcBytes[4]:=D shr 24;
+  SrcBytes[5]:=(D shr 16) and $FF;
+  SrcBytes[6]:=(D shr 8) and $FF;
+  SrcBytes[7]:=(D and $FF);
+  D:=Src.D2;
+  SrcBytes[8]:=(D shr 8) and $FF;
+  SrcBytes[9]:=(D and $FF);
+  D:=Src.D3;
+  SrcBytes[10]:=(D shr 8) and $FF;
+  SrcBytes[11]:=(D and $FF);
+  For I:=0 to 7 do
+   SrcBytes[12+i]:=Src.D4[i];
+  Dest:=TGUID.Create(SrcBytes, 4, TEndian.Big);
+  if CPUEndian = TEndian.Big then
+    EqualGUID('BE CPU: Create(Data,True)',Src,Dest)
+  else
+    EqualGUIDSwap('LE CPU: Create(Data,True)',Src,Dest);
+  Dest:=TGUID.Create(SrcBytes, 4, TEndian.Little);
+  if CPUEndian = TEndian.Big then
+    EqualGUIDSwap('BE CPU: Create(Data,False)',Src,Dest)
+  else
+    EqualGUID('LE CPU : Create(Data,False)',Src,Dest);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateString;
+
+Var
+  Src,Dest : TGUID;
+
+begin
+  GetGUID(Src);
+  Dest:=TGUID.Create(GUIDToString(Src));
+  EqualGUID('Check equals',Src,Dest);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateIntegerBytes;
+
+// Class Function Create(A: Integer; B: SmallInt; C: SmallInt; const D: TBytes): TGUID; overload; static;
+
+Var
+  A,I : Integer;
+  B,C : Smallint;
+  D : TBytes;
+  Dest : TGUID;
+
+begin
+  A:=1;
+  B:=2;
+  C:=3;
+  D:=Nil;
+  SetLength(D,8);
+  For I:=0 to 7 do
+    D[i]:=4+I;
+  Dest:=TGuid.Create(A,B,C,D);
+  AssertEquals('D1',1,Dest.D1);
+  AssertEquals('D2',2,Dest.D2);
+  AssertEquals('D3',3,Dest.D3);
+  For I:=0 to 7 do
+    AssertEquals('D4['+IntToStr(i)+']',I+4,Dest.D4[i]);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateWords;
+// Class Function Create(A: Cardinal; B: Word; C: Word; D, E, F, G, H, I, J, K: Byte): TGUID; overload; static;
+
+Var
+  A,I : Cardinal;
+  B,C : Word;
+  Dest : TGUID;
+
+begin
+  A:=1;
+  B:=Word($FFFE);
+  C:=Word($FFFF);
+  Dest:=TGuid.Create(A,B,C,4,5,6,7,8,9,10,11);
+  AssertEquals('D1',1,Dest.D1);
+  AssertEquals('D2',$FFFE,Dest.D2);
+  AssertEquals('D3',$FFFF,Dest.D3);
+  For I:=0 to 7 do
+    AssertEquals('D4['+IntToStr(i)+']',I+4,Dest.D4[i]);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateInteger;
+// Class Function Create(A: Integer; B: SmallInt; C: SmallInt; D, E, F, G, H, I, J, K: Byte): TGUID; overload; static;
+
+Var
+  A,I : Integer;
+  B,C : Smallint;
+  Dest : TGUID;
+
+begin
+  A:=1;
+  B:=Smallint($FFFE);
+  C:=Smallint($FFFF);
+  Dest:=TGuid.Create(A,B,C,4,5,6,7,8,9,10,11);
+  AssertEquals('D1',1,Dest.D1);
+  AssertEquals('D2',$FFFE,Dest.D2);
+  AssertEquals('D3',$FFFF,Dest.D3);
+  For I:=0 to 7 do
+    AssertEquals('D4['+IntToStr(i)+']',I+4,Dest.D4[i]);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperCreateNew;
+// Class Function NewGuid: TGUID; static;
+
+Var
+  Src,Dest : TGuid;
+  I,J : integer;
+
+begin
+  // All we can do is check that you don't get the same GUID twice.
+  Src:=TGuid.NewGuid;
+  Dest:=TGuid.NewGuid;
+  I:=0;
+  Inc(I,Ord(Src.D1<>Dest.D1));
+  Inc(I,Ord(Src.D2<>Dest.D2));
+  Inc(I,Ord(Src.D3<>Dest.D3));
+  For J:=0 to 7 do
+    Inc(I,Ord(Src.D4[i]<>Dest.D4[i]));
+  AssertTrue('D1<>D2',I>0);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperToByteArray;
+
+Var
+  Src,Dest : TGuid;
+  D : TBytes;
+
+begin
+  // All we can do is check that you don't get the same GUID twice.
+  Src:=TGuid.NewGuid;
+  D:=Src.ToByteArray(CPUEndian);
+  Dest:=TGUID.Create(D,CPUEndian);
+  EqualGUID('Check equals',Src,Dest);
+  if CPUEndian=TEndian.Big then
+    Dest:=TGUID.Create(D,TEndian.Little)
+  else
+    Dest:=TGUID.Create(D,TEndian.Big);
+  EqualGUIDSwap('Swapped, Check equals',Src,Dest);
+end;
+
+Procedure TTestHelpers.TestGUIDHelperToString;
+// Function ToString: string;
+
+Var
+  Src : TGuid;
+  S : String;
+begin
+  CreateGUID(Src);
+  S:=GuidToString(Src);
+  AssertEquals('Equal',S,Src.ToString);
+  Delete(S,1,1);
+  Delete(S,Length(S),1);
+  AssertEquals('Equal',S,Src.ToString(True));
+end;
+
+
+Procedure TTestHelpers.TestIsNanDouble;
+
+
+var
+  Value: Double;
+
+begin
+  asm
+  Value = Number.NaN; // Double.NaN;
+  end;
+  AssertEquals('Is Nan',True,Value.IsNan);
+end;
+
+
+
+
+Procedure TTestHelpers.TestByteSetBit;
+var
+  Index: TByteBitIndex;
+  B: Byte;
+const
+  Expected: array[TByteBitIndex] of byte = ($01,$03,$07,$0F,$1F,$3F,$7F,$FF);
+begin
+  // writeln('TestByteSetBit Start');
+  B := 0;
+  for Index in TByteBitIndex do
+  begin
+    B.SetBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],B);
+  end;
+  // writeln('TestByteSetBit: OK');
+end;
+
+Procedure TTestHelpers.TestByteToggleBit;
+var
+  Index: TByteBitIndex;
+  B: Byte;
+const
+  Expected: array[TByteBitIndex] of byte = ($01,$03,$07,$0F,$1F,$3F,$7F,$FF);
+begin
+  // writeln('TestByteToggleBit Start');
+  B := 0;
+  for Index in TByteBitIndex do
+  begin
+    B.ToggleBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],B);
+  end;
+  // writeln('TestByteToggleBit: OK');
+end;
+
+Procedure TTestHelpers.TestByteClearBit;
+var
+  Index: TByteBitIndex;
+  B: Byte;
+const
+  Expected: array[TByteBitIndex] of byte = ($FE,$FD,$FB,$F7,$EF,$DF,$BF,$7F);
+begin
+  // writeln('TestByteClearBit Start');
+  for Index in TByteBitIndex do
+  begin
+    B := High(Byte);
+    B.ClearBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],B);
+  end;
+  // writeln('TestByteClearBit: OK');
+end;
+
+Procedure TTestHelpers.TestByteTestBit;
+var
+  Index: TByteBitIndex;
+  B: Byte;
+const
+  Expected: array[TByteBitIndex] of Boolean = (True,False,True,False,True,False,True,False);
+begin
+  // writeln('TestByteTestBit Start');
+  B := $55;
+  for Index in TByteBitIndex do
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],B.TestBit(Index));
+  // writeln('TestByteTestBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestShortIntSetBit;
+var
+  Index: TShortIntBitIndex;
+  S: ShortInt;
+const
+  Expected: array[TByteBitIndex] of ShortInt = (
+    ShortInt($01),ShortInt($03),ShortInt($07),ShortInt($0F),
+    ShortInt($1F),ShortInt($3F),ShortInt($7F),ShortInt($FF));
+begin
+  // writeln('TestShortIntSetBit Start');
+  S := 0;
+  for Index in TShortIntBitIndex do
+  begin
+    S.SetBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S);
+  end;
+  // writeln('TestShortIntSetBit: OK');
+end;
+
+Procedure TTestHelpers.TestShortIntToggleBit;
+var
+  Index: TShortIntBitIndex;
+  S: ShortInt;
+const
+  Expected: array[TByteBitIndex] of ShortInt = (
+    ShortInt($01),ShortInt($03),ShortInt($07),ShortInt($0F),
+    ShortInt($1F),ShortInt($3F),ShortInt($7F),ShortInt($FF));
+begin
+  // writeln('TestShortIntToggleBit Start');
+  S := 0;
+  for Index in TShortIntBitIndex do
+  begin
+    S.ToggleBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S);
+  end;
+  // writeln('TestShortIntToggleBit: OK');
+end;
+
+Procedure TTestHelpers.TestShortIntClearBit;
+
+var
+  Index: TShortIntBitIndex;
+  S: ShortInt;
+const
+  Expected: array[TByteBitIndex] of ShortInt = (
+    ShortInt($FE),ShortInt($FD),ShortInt($FB),ShortInt($F7),
+    ShortInt($EF),ShortInt($DF),ShortInt($BF),ShortInt($7F));
+begin
+  // writeln('TestShortIntClearBit Start');
+  for Index in TShortIntBitIndex do
+  begin
+    S := ShortInt($FF);
+    S.ClearBit(Index);// was Togglebit ?
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S);
+  end;
+  // writeln('TestShortIntClearBit: OK');
+end;
+
+Procedure TTestHelpers.TestShortIntTestBit;
+
+var
+  Index: TShortIntBitIndex;
+  S: ShortInt;
+const
+  Expected: array[TByteBitIndex] of Boolean = (True,False,True,False,True,False,True,False);
+begin
+  // writeln('TestShortIntTestBit Start');
+  S := ShortInt($55);
+  for Index in TShortIntBitIndex do
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S.TestBit(Index));
+  // writeln('TestShortIntTestBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestWordSetBit;
+
+var
+  Index: TWordBitIndex;
+  W: Word;
+const
+  Expected: array[TWordBitIndex] of Word = (
+    $0001,$0003,$0007,$000F,$001F,$003F,$007F,$00FF,
+    $01FF,$03FF,$07FF,$0FFF,$1FFF,$3FFF,$7FFF,$FFFF);
+begin
+  // writeln('TestWordSetBit Start');
+  W := 0;
+  for Index in TWordBitIndex do
+  begin
+    W.SetBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],W);
+  end;
+  // writeln('TestWordSetBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestWordToggleBit;
+var
+  Index: TWordBitIndex;
+  W: Word;
+const
+  Expected: array[TWordBitIndex] of Word = (
+    $0001,$0003,$0007,$000F,$001F,$003F,$007F,$00FF,
+    $01FF,$03FF,$07FF,$0FFF,$1FFF,$3FFF,$7FFF,$FFFF);
+begin
+  // writeln('TestWordToggleBit Start');
+  W := 0;
+  for Index in TWordBitIndex do
+  begin
+    W.ToggleBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],W);
+  end;
+  // writeln('TestWordToggleBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestWordClearBit;
+var
+  Index: TWordBitIndex;
+  W: Word;
+const
+  Expected: array[TWordBitIndex] of Word = (
+    $FFFE,$FFFD,$FFFB,$FFF7,$FFEF,$FFDF,$FFBF,$FF7F,
+    $FEFF,$FDFF,$FBFF,$F7FF,$EFFF,$DFFF,$BFFF,$7FFF);
+begin
+  // writeln('TestWordClearBit Start');
+  for Index in TWordBitIndex do
+  begin
+    W := High(Word);
+    W.ClearBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],W);
+  end;
+  // writeln('TestWordClearBit: OK');
+end;
+
+Procedure TTestHelpers.TestWordTestBit;
+var
+  Index: TWordBitIndex;
+  W: Word;
+const
+  Expected: array[TWordBitIndex] of Boolean = (True,False,True,False,True,False,True,False,
+                                               True,False,True,False,True,False,True,False);
+begin
+  // writeln('TestWordTestBit Start');
+  W := $5555;
+  for Index in TWordBitIndex do
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],W.TestBit(Index));
+  // writeln('TestWordTestBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestSmallIntSetBit;
+var
+  Index: TSmallIntBitIndex;
+  S: SmallInt;
+
+const
+  Expected: array[TSmallIntBitIndex] of SmallInt = (
+    SmallInt($0001),SmallInt($0003),SmallInt($0007),SmallInt($000F),
+    SmallInt($001F),SmallInt($003F),SmallInt($007F),SmallInt($00FF),
+    SmallInt($01FF),SmallInt($03FF),SmallInt($07FF),SmallInt($0FFF),
+    SmallInt($1FFF),SmallInt($3FFF),SmallInt($7FFF),SmallInt($FFFF));
+begin
+  // writeln('TestSmallIntSetBit Start');
+  S := 0;
+  for Index in TSmallIntBitIndex do
+  begin
+    S.SetBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S);
+  end;
+  // writeln('TestSmallIntSetBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestSmallIntToggleBit;
+var
+  Index: TSmallIntBitIndex;
+  S: SmallInt;
+const
+  Expected: array[TSmallIntBitIndex] of SmallInt = (
+    SmallInt($0001),SmallInt($0003),SmallInt($0007),SmallInt($000F),
+    SmallInt($001F),SmallInt($003F),SmallInt($007F),SmallInt($00FF),
+    SmallInt($01FF),SmallInt($03FF),SmallInt($07FF),SmallInt($0FFF),
+    SmallInt($1FFF),SmallInt($3FFF),SmallInt($7FFF),SmallInt($FFFF));
+begin
+  // writeln('TestSmallIntToggleBit Start');
+  S := 0;
+  for Index in TSmallIntBitIndex do
+  begin
+    S.ToggleBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S);
+  end;
+  // writeln('TestSmallIntToggleBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestSmallIntClearBit;
+var
+  Index: TSmallIntBitIndex;
+  S: SmallInt;
+const
+  Expected: array[TSmallIntBitIndex] of SmallInt = (
+    SmallInt($FFFE),SmallInt($FFFD),SmallInt($FFFB),SmallInt($FFF7),
+    SmallInt($FFEF),SmallInt($FFDF),SmallInt($FFBF),SmallInt($FF7F),
+    SmallInt($FEFF),SmallInt($FDFF),SmallInt($FBFF),SmallInt($F7FF),
+    SmallInt($EFFF),SmallInt($DFFF),SmallInt($BFFF),SmallInt($7FFF));
+begin
+  // writeln('TestSmallIntClearBit Start');
+  for Index in TSmallIntBitIndex do
+  begin
+    S := SmallInt($FFFF);
+    S.ClearBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S);
+  end;
+  // writeln('TestSmallIntClearBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestSmallIntTestBit;
+var
+  Index: TSmallIntBitIndex;
+  S: SmallInt;
+const
+  Expected: array[TSmallIntBitIndex] of Boolean = (True,False,True,False,True,False,True,False,
+                                                   True,False,True,False,True,False,True,False);
+begin
+  // writeln('TestSmallIntTestBit Start');
+  S := SMallInt($5555);
+  for Index in TSmallIntBitIndex do
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S.TestBit(Index));
+  // writeln('TestSmallIntTestBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestCardinalSetBit;
+var
+  Index: TCardinalBitIndex;
+  C: Cardinal;
+const
+  Expected: array[TCardinalBitIndex] of Cardinal = (
+    $00000001,$00000003,$00000007,$0000000F,
+    $0000001F,$0000003F,$0000007F,$000000FF,
+    $000001FF,$000003FF,$000007FF,$00000FFF,
+    $00001FFF,$00003FFF,$00007FFF,$0000FFFF,
+    $0001FFFF,$0003FFFF,$0007FFFF,$000FFFFF,
+    $001FFFFF,$003FFFFF,$007FFFFF,$00FFFFFF,
+    $01FFFFFF,$03FFFFFF,$07FFFFFF,$0FFFFFFF,
+    $1FFFFFFF,$3FFFFFFF,$7FFFFFFF,$FFFFFFFF);
+begin
+  // writeln('TestCardinalSetBit Start');
+  C := 0;
+  for Index in TCardinalBitIndex do
+  begin
+    C.SetBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],C);
+  end;
+  // writeln('TestCardinalSetBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestCardinalToggleBit;
+var
+  Index: TCardinalBitIndex;
+  C: Cardinal;
+const
+  Expected: array[TCardinalBitIndex] of Cardinal = (
+    $00000001,$00000003,$00000007,$0000000F,
+    $0000001F,$0000003F,$0000007F,$000000FF,
+    $000001FF,$000003FF,$000007FF,$00000FFF,
+    $00001FFF,$00003FFF,$00007FFF,$0000FFFF,
+    $0001FFFF,$0003FFFF,$0007FFFF,$000FFFFF,
+    $001FFFFF,$003FFFFF,$007FFFFF,$00FFFFFF,
+    $01FFFFFF,$03FFFFFF,$07FFFFFF,$0FFFFFFF,
+    $1FFFFFFF,$3FFFFFFF,$7FFFFFFF,$FFFFFFFF);
+begin
+  // writeln('TestCardinalToggleBit Start');
+  C := 0;
+  for Index in TCardinalBitIndex do
+  begin
+    C.ToggleBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],C);
+  end;
+  // writeln('TestCardinalToggleBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestCardinalClearBit;
+var
+  Index: TCardinalBitIndex;
+  C: Cardinal;
+const
+  Expected: array[TCardinalBitIndex] of Cardinal = (
+    $FFFFFFFE,$FFFFFFFD,$FFFFFFFB,$FFFFFFF7,
+    $FFFFFFEF,$FFFFFFDF,$FFFFFFBF,$FFFFFF7F,
+    $FFFFFEFF,$FFFFFDFF,$FFFFFBFF,$FFFFF7FF,
+    $FFFFEFFF,$FFFFDFFF,$FFFFBFFF,$FFFF7FFF,
+    $FFFEFFFF,$FFFDFFFF,$FFFBFFFF,$FFF7FFFF,
+    $FFEFFFFF,$FFDFFFFF,$FFBFFFFF,$FF7FFFFF,
+    $FEFFFFFF,$FDFFFFFF,$FBFFFFFF,$F7FFFFFF,
+    $EFFFFFFF,$DFFFFFFF,$BFFFFFFF,$7FFFFFFF);
+begin
+  // writeln('TestCardinalClearBit Start');
+  for Index in TCardinalBitIndex do
+  begin
+    C := High(Cardinal);
+    C.ClearBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],C);
+  end;
+  // writeln('TestCardinalClearBit: OK');
+end;
+
+Procedure TTestHelpers.TestCardinalTestBit;
+var
+  Index: TCardinalBitIndex;
+  C: Cardinal;
+const
+  Expected: array[TCardinalBitIndex] of Boolean = (
+                                               True,False,True,False,True,False,True,False,
+                                               True,False,True,False,True,False,True,False,
+                                               True,False,True,False,True,False,True,False,
+                                               True,False,True,False,True,False,True,False);
+begin
+  // writeln('TestCardinalTestBit Start');
+  C := $55555555;
+  for Index in TCardinalBitIndex do
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],C.TestBit(Index));
+  // writeln('TestCardinalTestBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestLongintSetBit;
+
+var
+  Index: TLongintBitIndex;
+  L: Longint;
+
+const
+  Expected: array[TLongintBitIndex] of Longint = (
+    Longint($00000001),Longint($00000003),Longint($00000007),Longint($0000000F),
+    Longint($0000001F),Longint($0000003F),Longint($0000007F),Longint($000000FF),
+    Longint($000001FF),Longint($000003FF),Longint($000007FF),Longint($00000FFF),
+    Longint($00001FFF),Longint($00003FFF),Longint($00007FFF),Longint($0000FFFF),
+    Longint($0001FFFF),Longint($0003FFFF),Longint($0007FFFF),Longint($000FFFFF),
+    Longint($001FFFFF),Longint($003FFFFF),Longint($007FFFFF),Longint($00FFFFFF),
+    Longint($01FFFFFF),Longint($03FFFFFF),Longint($07FFFFFF),Longint($0FFFFFFF),
+    Longint($1FFFFFFF),Longint($3FFFFFFF),Longint($7FFFFFFF),Longint($FFFFFFFF));
+
+begin
+  // writeln('TestLongintSetBit Start');
+  L := 0;
+  for Index in TLongintBitIndex do
+  begin
+    L.SetBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],L);
+  end;
+  // writeln('TestLongintSetBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestLongintToggleBit;
+var
+  Index: TLongintBitIndex;
+  L: Longint;
+const
+  Expected: array[TLongintBitIndex] of Longint = (
+    Longint($00000001),Longint($00000003),Longint($00000007),Longint($0000000F),
+    Longint($0000001F),Longint($0000003F),Longint($0000007F),Longint($000000FF),
+    Longint($000001FF),Longint($000003FF),Longint($000007FF),Longint($00000FFF),
+    Longint($00001FFF),Longint($00003FFF),Longint($00007FFF),Longint($0000FFFF),
+    Longint($0001FFFF),Longint($0003FFFF),Longint($0007FFFF),Longint($000FFFFF),
+    Longint($001FFFFF),Longint($003FFFFF),Longint($007FFFFF),Longint($00FFFFFF),
+    Longint($01FFFFFF),Longint($03FFFFFF),Longint($07FFFFFF),Longint($0FFFFFFF),
+    Longint($1FFFFFFF),Longint($3FFFFFFF),Longint($7FFFFFFF),Longint($FFFFFFFF));
+
+begin
+  // writeln('TestLongintToggleBit Start');
+  L := 0;
+  for Index in TLongintBitIndex do
+  begin
+    L.ToggleBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],L);
+  end;
+  // writeln('TestLongintToggleBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestLongintClearBit;
+var
+  Index: TLongintBitIndex;
+  L: Longint;
+const
+  Expected: array[TLongintBitIndex] of Longint = (
+    Longint($FFFFFFFE),Longint($FFFFFFFD),Longint($FFFFFFFB),Longint($FFFFFFF7),
+    Longint($FFFFFFEF),Longint($FFFFFFDF),Longint($FFFFFFBF),Longint($FFFFFF7F),
+    Longint($FFFFFEFF),Longint($FFFFFDFF),Longint($FFFFFBFF),Longint($FFFFF7FF),
+    Longint($FFFFEFFF),Longint($FFFFDFFF),Longint($FFFFBFFF),Longint($FFFF7FFF),
+    Longint($FFFEFFFF),Longint($FFFDFFFF),Longint($FFFBFFFF),Longint($FFF7FFFF),
+    Longint($FFEFFFFF),Longint($FFDFFFFF),Longint($FFBFFFFF),Longint($FF7FFFFF),
+    Longint($FEFFFFFF),Longint($FDFFFFFF),Longint($FBFFFFFF),Longint($F7FFFFFF),
+    Longint($EFFFFFFF),Longint($DFFFFFFF),Longint($BFFFFFFF),Longint($7FFFFFFF));
+
+begin
+  // writeln('TestLongintClearBit Start');
+  for Index in TLongintBitIndex do
+  begin
+    L := Longint($FFFFFFFF);
+    L.ClearBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],L);
+  end;
+  // writeln('TestLongintClearBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestLongintTestBit;
+
+var
+  Index: TLongintBitIndex;
+  L: Longint;
+const
+  Expected: array[TLongintBitIndex] of Boolean = (
+                                               True,False,True,False,True,False,True,False,
+                                               True,False,True,False,True,False,True,False,
+                                               True,False,True,False,True,False,True,False,
+                                               True,False,True,False,True,False,True,False);
+begin
+  // writeln('TestLongintTestBit Start');
+  L := Longint($55555555);
+  for Index in TLongintBitIndex do
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],L.TestBit(Index));
+  // writeln('TestLongintTestBit: OK');
+end;
+
+
+
+Procedure TTestHelpers.TestNativeUintSetBit;
+var
+  Index: TQWordBitIndex;
+  Q: NativeUInt;
+const
+  Expected: array[TQWordBitIndex] of NativeUInt = (
+    $0000000000000001,$0000000000000003,$0000000000000007,$000000000000000F,
+    $000000000000001F,$000000000000003F,$000000000000007F,$00000000000000FF,
+    $00000000000001FF,$00000000000003FF,$00000000000007FF,$0000000000000FFF,
+    $0000000000001FFF,$0000000000003FFF,$0000000000007FFF,$000000000000FFFF,
+    $000000000001FFFF,$000000000003FFFF,$000000000007FFFF,$00000000000FFFFF,
+    $00000000001FFFFF,$00000000003FFFFF,$00000000007FFFFF,$0000000000FFFFFF,
+    $0000000001FFFFFF,$0000000003FFFFFF,$0000000007FFFFFF,$000000000FFFFFFF,
+    $000000001FFFFFFF,$000000003FFFFFFF,$000000007FFFFFFF,$00000000FFFFFFFF,
+    $00000001FFFFFFFF,$00000003FFFFFFFF,$00000007FFFFFFFF,$0000000FFFFFFFFF,
+    $0000001FFFFFFFFF,$0000003FFFFFFFFF,$0000007FFFFFFFFF,$000000FFFFFFFFFF,
+    $000001FFFFFFFFFF,$000003FFFFFFFFFF,$000007FFFFFFFFFF,$00000FFFFFFFFFFF,
+    $00001FFFFFFFFFFF,$00003FFFFFFFFFFF,$00007FFFFFFFFFFF,$0000FFFFFFFFFFFF,
+    $0001FFFFFFFFFFFF,$0003FFFFFFFFFFFF,$0007FFFFFFFFFFFF,$000FFFFFFFFFFFFF,
+    $001FFFFFFFFFFFFF{,$003FFFFFFFFFFFFF,$007FFFFFFFFFFFFF,$00FFFFFFFFFFFFFF,
+    $01FFFFFFFFFFFFFF,$03FFFFFFFFFFFFFF,$07FFFFFFFFFFFFFF,$0FFFFFFFFFFFFFFF,
+    $1FFFFFFFFFFFFFFF,$3FFFFFFFFFFFFFFF,$7FFFFFFFFFFFFFFF,QWORD($FFFFFFFFFFFFFFFF)});
+begin
+  Fail('Not implemented');
+  // writeln('TestQWordSetBit Start');
+  Q := 0;
+  for Index in TQWordBitIndex do
+  begin
+// TODO    Q.SetBit(Index);
+//    AssertEquals('Bit '+IntToStr(Index),Expected[Index],S);
+  end;
+  // writeln('TestQWordSetBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestNativeUIntToggleBit;
+
+var
+  Index: TQWordBitIndex;
+  Q: NativeUint;
+const
+  Expected: array[TQWordBitIndex] of NativeUInt = (
+    $0000000000000001,$0000000000000003,$0000000000000007,$000000000000000F,
+    $000000000000001F,$000000000000003F,$000000000000007F,$00000000000000FF,
+    $00000000000001FF,$00000000000003FF,$00000000000007FF,$0000000000000FFF,
+    $0000000000001FFF,$0000000000003FFF,$0000000000007FFF,$000000000000FFFF,
+    $000000000001FFFF,$000000000003FFFF,$000000000007FFFF,$00000000000FFFFF,
+    $00000000001FFFFF,$00000000003FFFFF,$00000000007FFFFF,$0000000000FFFFFF,
+    $0000000001FFFFFF,$0000000003FFFFFF,$0000000007FFFFFF,$000000000FFFFFFF,
+    $000000001FFFFFFF,$000000003FFFFFFF,$000000007FFFFFFF,$00000000FFFFFFFF,
+    $00000001FFFFFFFF,$00000003FFFFFFFF,$00000007FFFFFFFF,$0000000FFFFFFFFF,
+    $0000001FFFFFFFFF,$0000003FFFFFFFFF,$0000007FFFFFFFFF,$000000FFFFFFFFFF,
+    $000001FFFFFFFFFF,$000003FFFFFFFFFF,$000007FFFFFFFFFF,$00000FFFFFFFFFFF,
+    $00001FFFFFFFFFFF,$00003FFFFFFFFFFF,$00007FFFFFFFFFFF,$0000FFFFFFFFFFFF,
+    $0001FFFFFFFFFFFF,$0003FFFFFFFFFFFF,$0007FFFFFFFFFFFF,$000FFFFFFFFFFFFF,
+    $001FFFFFFFFFFFFF{,$003FFFFFFFFFFFFF,$007FFFFFFFFFFFFF,$00FFFFFFFFFFFFFF,
+    $01FFFFFFFFFFFFFF,$03FFFFFFFFFFFFFF,$07FFFFFFFFFFFFFF,$0FFFFFFFFFFFFFFF,
+    $1FFFFFFFFFFFFFFF,$3FFFFFFFFFFFFFFF,$7FFFFFFFFFFFFFFF,QWORD($FFFFFFFFFFFFFFFF)});
+begin
+  Fail('Not implemented');
+  // writeln('TestQWordToggleBit Start');
+  Q := 0;
+  for Index in TQWordBitIndex do
+  begin
+// TODO    Q.ToggleBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],Q);
+  end;
+  // writeln('TestQWordToggleBit: OK');
+end;
+
+
+
+Procedure TTestHelpers.TestNativeUIntTestBit;
+var
+  Index: TQWordBitIndex;
+  Q: NativeUint;
+const
+  Expected: array[TQWordBitIndex] of Boolean = (True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True);
+begin
+  Fail('NotImplemented');
+  // writeln('TestQWordTestBit Start');
+  Q := $5555555555;
+  for Index in TQWordBitIndex do
+//    AssertEquals('Bit '+IntToStr(Index),Expected[Index],Q.TestBit(Index));
+  // writeln('TestQWordTestBit: OK');
+end;
+
+
+
+Procedure TTestHelpers.TestNativeIntSetBit;
+var
+  Index: TInt64BitIndex;
+  I64: NativeInt;
+const
+  Expected: array[TNativeIntBitIndex] of NativeInt = (
+    NativeInt($0000000000000001),NativeInt($0000000000000003),NativeInt($0000000000000007),NativeInt($000000000000000F),
+    NativeInt($000000000000001F),NativeInt($000000000000003F),NativeInt($000000000000007F),NativeInt($00000000000000FF),
+    NativeInt($00000000000001FF),NativeInt($00000000000003FF),NativeInt($00000000000007FF),NativeInt($0000000000000FFF),
+    NativeInt($0000000000001FFF),NativeInt($0000000000003FFF),NativeInt($0000000000007FFF),NativeInt($000000000000FFFF),
+    NativeInt($000000000001FFFF),NativeInt($000000000003FFFF),NativeInt($000000000007FFFF),NativeInt($00000000000FFFFF),
+    NativeInt($00000000001FFFFF),NativeInt($00000000003FFFFF),NativeInt($00000000007FFFFF),NativeInt($0000000000FFFFFF),
+    NativeInt($0000000001FFFFFF),NativeInt($0000000003FFFFFF),NativeInt($0000000007FFFFFF),NativeInt($000000000FFFFFFF),
+    NativeInt($000000001FFFFFFF),NativeInt($000000003FFFFFFF),NativeInt($000000007FFFFFFF),NativeInt($00000000FFFFFFFF),
+    NativeInt($00000001FFFFFFFF),NativeInt($00000003FFFFFFFF),NativeInt($00000007FFFFFFFF),NativeInt($0000000FFFFFFFFF),
+    NativeInt($0000001FFFFFFFFF),NativeInt($0000003FFFFFFFFF),NativeInt($0000007FFFFFFFFF),NativeInt($000000FFFFFFFFFF),
+    NativeInt($000001FFFFFFFFFF),NativeInt($000003FFFFFFFFFF),NativeInt($000007FFFFFFFFFF),NativeInt($00000FFFFFFFFFFF),
+    NativeInt($00001FFFFFFFFFFF),NativeInt($00003FFFFFFFFFFF),NativeInt($00007FFFFFFFFFFF),NativeInt($0000FFFFFFFFFFFF),
+    NativeInt($0001FFFFFFFFFFFF),NativeInt($0003FFFFFFFFFFFF),NativeInt($0007FFFFFFFFFFFF),NativeInt($000FFFFFFFFFFFFF),
+    NativeInt($001FFFFFFFFFFFFF));
+begin
+  Fail('Not implemented');
+  // writeln('TestNativeIntSetBit Start');
+  I64 := 0;
+  for Index in TNativeIntBitIndex do
+  begin
+// TODO    I64.SetBit(Index);
+    AssertEquals('Bit '+IntToStr(Index),Expected[Index],I64);
+  end;
+  // writeln('TestNativeIntSetBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestNativeIntToggleBit;
+var
+  Index: TNativeIntBitIndex;
+  I64: NativeInt;
+const
+  Expected: array[TNativeIntBitIndex] of NativeInt = (
+  NativeInt($0000000000000001),NativeInt($0000000000000003),NativeInt($0000000000000007),NativeInt($000000000000000F),
+  NativeInt($000000000000001F),NativeInt($000000000000003F),NativeInt($000000000000007F),NativeInt($00000000000000FF),
+  NativeInt($00000000000001FF),NativeInt($00000000000003FF),NativeInt($00000000000007FF),NativeInt($0000000000000FFF),
+  NativeInt($0000000000001FFF),NativeInt($0000000000003FFF),NativeInt($0000000000007FFF),NativeInt($000000000000FFFF),
+  NativeInt($000000000001FFFF),NativeInt($000000000003FFFF),NativeInt($000000000007FFFF),NativeInt($00000000000FFFFF),
+  NativeInt($00000000001FFFFF),NativeInt($00000000003FFFFF),NativeInt($00000000007FFFFF),NativeInt($0000000000FFFFFF),
+  NativeInt($0000000001FFFFFF),NativeInt($0000000003FFFFFF),NativeInt($0000000007FFFFFF),NativeInt($000000000FFFFFFF),
+  NativeInt($000000001FFFFFFF),NativeInt($000000003FFFFFFF),NativeInt($000000007FFFFFFF),NativeInt($00000000FFFFFFFF),
+  NativeInt($00000001FFFFFFFF),NativeInt($00000003FFFFFFFF),NativeInt($00000007FFFFFFFF),NativeInt($0000000FFFFFFFFF),
+  NativeInt($0000001FFFFFFFFF),NativeInt($0000003FFFFFFFFF),NativeInt($0000007FFFFFFFFF),NativeInt($000000FFFFFFFFFF),
+  NativeInt($000001FFFFFFFFFF),NativeInt($000003FFFFFFFFFF),NativeInt($000007FFFFFFFFFF),NativeInt($00000FFFFFFFFFFF),
+  NativeInt($00001FFFFFFFFFFF),NativeInt($00003FFFFFFFFFFF),NativeInt($00007FFFFFFFFFFF),NativeInt($0000FFFFFFFFFFFF),
+  NativeInt($0001FFFFFFFFFFFF),NativeInt($0003FFFFFFFFFFFF),NativeInt($0007FFFFFFFFFFFF),NativeInt($000FFFFFFFFFFFFF),
+  NativeInt($001FFFFFFFFFFFFF));
+begin
+  Fail('Not implemented');
+  // writeln('TestNativeIntToggleBit Start');
+  I64 := 0;
+  for Index in TNativeIntBitIndex do
+  begin
+    //I64.ToggleBit(Index);
+      AssertEquals('Bit '+IntToStr(Index),Expected[Index],I64);
+  end;
+  // writeln('TestNativeIntToggleBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestNativeIntClearBit;
+var
+  Index: TNativeIntBitIndex;
+  I64: NativeInt;
+begin
+  Fail('NotImplemented');
+//  for Index in TNativeIntBitIndex do
+  begin
+//    I64 := NativeInt($FFFFFFFFFFFFFFFF);
+//    I64.ClearBit(Index);
+//    AssertEquals('Bit '+IntToStr(Index),Expected[Index],I64);
+  end;
+  // writeln('TestNativeIntClearBit: OK');
+end;
+
+
+Procedure TTestHelpers.TestNativeIntTestBit;
+var
+  Index: TNativeIntBitIndex;
+  I64: NativeInt;
+const
+  Expected: array[TNativeIntBitIndex] of Boolean = (True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True,False,True,False,
+                                                True,False,True,False,True);
+begin
+  // writeln('TestNativeIntTestBit Start');
+  I64 := NativeInt($5555555555555);
+  for Index in TNativeIntBitIndex do
+//    AssertEquals('Bit '+IntToStr(Index),Expected[Index],I64.TestBit(Index));
+  // writeln('TestNativeIntTestBit: OK');
+end;
+
+
+
+initialization
+  RegisterTest(TTestHelpers);
+end.
+
diff --git a/test/testrtl.lpi b/test/testrtl.lpi
index 8d4ae44..80f7421 100644
--- a/test/testrtl.lpi
+++ b/test/testrtl.lpi
@@ -28,7 +28,6 @@
     </PublishOptions>
     <RunParams>
       <FormatVersion Value="2"/>
-      <Modes Count="0"/>
     </RunParams>
     <Units>
       <Unit>
@@ -66,6 +65,10 @@
         <Filename Value="../packages/rtl/simplelinkedlist.pas"/>
         <IsPartOfProject Value="True"/>
       </Unit>
+      <Unit>
+        <Filename Value="tcsyshelpers.pp"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
     </Units>
   </ProjectOptions>
   <CompilerOptions>
@@ -98,16 +101,16 @@
     </Other>
   </CompilerOptions>
   <Debugging>
-    <Exceptions Count="3">
-      <Item1>
+    <Exceptions>
+      <Item>
         <Name Value="EAbort"/>
-      </Item1>
-      <Item2>
+      </Item>
+      <Item>
         <Name Value="ECodetoolError"/>
-      </Item2>
-      <Item3>
+      </Item>
+      <Item>
         <Name Value="EFOpenError"/>
-      </Item3>
+      </Item>
     </Exceptions>
   </Debugging>
 </CONFIG>
diff --git a/test/testrtl.lpr b/test/testrtl.lpr
index f9abb19..18f3850 100644
--- a/test/testrtl.lpr
+++ b/test/testrtl.lpr
@@ -1,9 +1,32 @@
+{ Test program for basic RTL functionality
+
+  Copyright (C) 2020- Michael Van Canneyt michael@freepascal.org
+
+  This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public
+  License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version
+  with the following modification:
+
+  As a special exception, the copyright holders of this library give you permission to link this library with independent modules
+  to produce an executable, regardless of the license terms of these independent modules,and to copy and distribute the resulting
+  executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions
+  of the license of that module. An independent module is a module which is not derived from or based on this library. If you
+  modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do
+  not wish to do so, delete this exception statement from your version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details.
+
+  You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free
+  Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA.
+}
+
 program testrtl;
 
 {$mode objfpc}
 
 uses
-  browserconsole, {browsertestrunner} consoletestrunner, JS, Classes, SysUtils, Web, frmrtlrun, tcstream, tccompstreaming, simplelinkedlist;
+  browserconsole, consoletestrunner, frmrtlrun,
+  tcstream, tccompstreaming, simplelinkedlist, tcsyshelpers;
 
 var
   Application : TTestRunner;