457     assert(baseName("file", "file"w.dup) == "file");
458     assert(baseName("dir/file.ext"d.dup) == "file.ext");
463     assert(baseName("dir/subdir/".dup, "subdir") == "subdir");
464     assert(baseName("/"w.dup) == "/");
465     assert(baseName("//"d.dup) == "/");
580     assert(dirName("dir/file"w.dup) == "dir");
581     assert(dirName("dir///file"d.dup) == "dir");
1014     assert(extSeparatorPos(".foo".dup) == -1);
1015     assert(extSeparatorPos(".foo.ext"w.dup) == 4);
1020     assert(extSeparatorPos("dir/file"d.dup) == -1);
1024     assert(extSeparatorPos("dir/.foo.ext".dup) == 8);
1075     assert(extension(".foo".dup).empty);
1076     assert(extension(".foo.ext"w.dup) == ".ext");
1227     assert(setExtension("file"w.dup, "ext"w) == "file.ext");
1228     assert(setExtension("file"w.dup, ".ext"w) == "file.ext");
1229     assert(setExtension("file."w, "ext"w.dup) == "file.ext");
1230     assert(setExtension("file."w, ".ext"w.dup) == "file.ext");
1231     assert(setExtension("file.old"d.dup, "new"d) == "file.new");
1232     assert(setExtension("file.old"d.dup, ".new"d) == "file.new");
1237     static assert(setExtension("file"w.dup, "ext"w) == "file.ext");
1238     static assert(setExtension("file.old"d.dup, "new"d) == "file.new");
1341     assert(defaultExtension("file"w.dup, "ext"w) == "file.ext");
1342     assert(defaultExtension("file.old"d.dup, "new"d) == "file.old");
1347     static assert(defaultExtension("file"w.dup, "ext"w) == "file.ext");
1348     static assert(defaultExtension("file.old"d.dup, "new"d) == "file.old");
1522     InputRange!(C[]) ir(C)(C[][] p...) { return inputRangeObject(p.dup); }
1529         assert(buildPath("foo/".dup, "bar") == "foo/bar");  in version()
1530         assert(buildPath("foo///", "bar".dup) == "foo///bar");  in version()
1532         assert(buildPath("foo"w.dup, "/bar"w) == "/bar");  in version()
1533         assert(buildPath("foo"w, "bar/"w.dup) == "foo/bar/");  in version()
1535         assert(buildPath(""d.dup, "foo"d) == "foo");  in version()
1536         assert(buildPath("foo"d, ""d.dup) == "foo");  in version()
1537         assert(buildPath("foo", "bar".dup, "baz") == "foo/bar/baz");  in version()
1538         assert(buildPath("foo"w, "/bar"w, "baz"w.dup) == "/bar/baz");  in version()
1549         assert(buildPath(ir("foo/".dup, "bar".dup)) == "foo/bar");  in version()
1550         assert(buildPath(ir("foo///".dup, "bar".dup)) == "foo///bar");  in version()
1552         assert(buildPath(ir("foo"w.dup, "/bar"w.dup)) == "/bar");  in version()
1553         assert(buildPath(ir("foo"w.dup, "bar/"w.dup)) == "foo/bar/");  in version()
1555         assert(buildPath(ir(""d.dup, "foo"d.dup)) == "foo");  in version()
1558         assert(buildPath(ir("foo"w.dup, "/bar"w.dup, "baz"w.dup)) == "/bar/baz");  in version()
1567         assert(buildPath("foo"w, `d:\bar`w.dup) ==  `d:\bar`);  in version()
1579         assert(buildPath(ir("foo"w.dup, `d:\bar`w.dup)) ==  `d:\bar`);  in version()
2514     assert(equal2(pathSplitter("/foo/bar".dup), ["/", "foo", "bar"]));
2517     assert(equal2(pathSplitter("foo/bar"d.dup), ["foo"d, "bar"d]));
2532         assert(equal2(pathSplitter("//foo/bar"w.dup), ["/"w, "foo"w, "bar"w]));  in version()
2549         assert(equal(pathSplitter("/foo/bar".dup), ["/", "foo", "bar"]));
2695     assert(isAbsolute("/foo".dup));  in version()
2704     assert(!isAbsolute("\\"w.dup));  in version()
2705     assert(!isAbsolute("\\foo"d.dup));  in version()