chdir

import std.algorithm.comparison : equal;
import std.algorithm.sorting : sort;
import std.array : array;
import std.path : buildPath;

auto cwd = getcwd;
auto dir = deleteme ~ "dir";
dir.mkdir;
scope(exit) cwd.chdir, dir.rmdirRecurse;

dir.buildPath("a").write(".");
dir.chdir; // step into dir
"b".write(".");
assert(dirEntries(".", SpanMode.shallow).array.sort.equal(
    [".".buildPath("a"), ".".buildPath("b")]
));