import std.exception : assertThrown;

auto source = deleteme ~ "source";
auto target = deleteme ~ "target";

assert(!source.exists);
assertThrown!FileException(source.isSymlink);

// symlinking isn't available on Windows
version (Posix)
{
    scope(exit) source.remove, target.remove;

    target.write("target");
    target.symlink(source);
    assert(source.readText == "target");
    assert(source.isSymlink);
    assert(source.getLinkAttributes.attrIsSymlink);
}