public void CompileProjectionAmount(ProjectionType type, string expectedProjection)
{
var projection = new Projection {
Value = "x", ProjectionType = type
};
var compiler = new AstCompiler();
projection.Accept(compiler);
var code = compiler.ToString();
output.WriteLine(code);
Assert.NotNull(code);
Assert.Equal($".Select(Vars => {expectedProjection})", code.TrimEnd());
}