public void Variables()
{
var expr = "v";
var parsed = HandlebarsExpression.Parse(expr);
Assert.IsType <HandlebarsVariable>(parsed);
Assert.Equal("v", (parsed as HandlebarsVariable).Name);
expr = "var1";
parsed = HandlebarsExpression.Parse(expr);
Assert.IsType <HandlebarsVariable>(parsed);
Assert.Equal("var1", (parsed as HandlebarsVariable).Name);
expr = "var_1";
parsed = HandlebarsExpression.Parse(expr);
Assert.IsType <HandlebarsVariable>(parsed);
Assert.Equal("var_1", (parsed as HandlebarsVariable).Name);
expr = "*"; // illegal character
Assert.Throws <Sprache.ParseException>(() => HandlebarsExpression.Parse(expr));
}