public static void CompareTrees(string expected, AstRoot actualTree)
{
AstWriter astWriter = new AstWriter();
string actual = astWriter.WriteTree(actualTree);
string expectedLine, actualLine;
int index;
int result = BaselineCompare.CompareLines(expected, actual, out expectedLine, out actualLine, out index);
result.Should().Be(0, "Line at {0} should be {1}, but found {2}, different at position {3}", result, expectedLine, actualLine, index);
}