Adding another test case.

src/dotnet/TinyCompiler/TinyCompiler.Tests/LexerTests.cs

@@ -30,6 +30,7 @@ public class LexerTests
         [InlineData("WHILE", TokenType.While)]
         [InlineData("REPEAT", TokenType.Repeat)]
         [InlineData("ENDWHILE", TokenType.EndWhile)]
+        [InlineData("\n", TokenType.Newline)]
         public void SimpleSource_LexterReturnsExpectedToken(string source, TokenType expectedKind)
         {
             Lexer lexer = new Lexer(source);