+
+type RelTests struct {
+ root, path, want string
+}
+
+var reltests = []RelTests{
+ {"a/b", "a/b", "."},
+ {"a/b/.", "a/b", "."},
+ {"a/b", "a/b/.", "."},
+ {"./a/b", "a/b", "."},
+ {"a/b", "./a/b", "."},
+ {"ab/cd", "ab/cde", "../cde"},
+ {"ab/cd", "ab/c", "../c"},
+ {"a/b", "a/b/c/d", "c/d"},
+ {"a/b", "a/b/../c", "../c"},
+ {"a/b/../c", "a/b", "../b"},
+ {"a/b/c", "a/c/d", "../../c/d"},
+ {"a/b", "c/d", "../../c/d"},
+ {"../../a/b", "../../a/b/c/d", "c/d"},
+ {"/a/b", "/a/b", "."},
+ {"/a/b/.", "/a/b", "."},
+ {"/a/b", "/a/b/.", "."},
+ {"/ab/cd", "/ab/cde", "../cde"},
+ {"/ab/cd", "/ab/c", "../c"},
+ {"/a/b", "/a/b/c/d", "c/d"},
+ {"/a/b", "/a/b/../c", "../c"},
+ {"/a/b/../c", "/a/b", "../b"},
+ {"/a/b/c", "/a/c/d", "../../c/d"},
+ {"/a/b", "/c/d", "../../c/d"},
+ {"/../../a/b", "/../../a/b/c/d", "c/d"},
+ {".", "a/b", "a/b"},
+ {".", "..", ".."},
+
+ // can't do purely lexically
+ {"..", ".", "err"},
+ {"..", "a", "err"},
+ {"../..", "..", "err"},
+ {"a", "/a", "err"},
+ {"/a", "a", "err"},
+}
+
+var winreltests = []RelTests{
+ {`C:a\b\c`, `C:a/b/d`, `..\d`},
+ {`C:\`, `D:\`, `err`},
+ {`C:`, `D:`, `err`},
+}
+
+func TestRel(t *testing.T) {
+ tests := append([]RelTests{}, reltests...)
+ if runtime.GOOS == "windows" {
+ for i := range tests {
+ tests[i].want = filepath.FromSlash(tests[i].want)
+ }
+ tests = append(tests, winreltests...)
+ }
+ for _, test := range tests {
+ got, err := filepath.Rel(test.root, test.path)
+ if test.want == "err" {
+ if err == nil {
+ t.Errorf("Rel(%q, %q)=%q, want error", test.root, test.path, got)
+ }
+ continue
+ }
+ if err != nil {
+ t.Errorf("Rel(%q, %q): want %q, got error: %s", test.root, test.path, test.want, err)
+ }
+ if got != test.want {
+ t.Errorf("Rel(%q, %q)=%q, want %q", test.root, test.path, got, test.want)
+ }
+ }
+}
+
+type VolumeNameTest struct {
+ path string
+ vol string
+}
+
+var volumenametests = []VolumeNameTest{
+ {`c:/foo/bar`, `c:`},
+ {`c:`, `c:`},
+ {``, ``},
+ {`\\\host`, ``},
+ {`\\\host\`, ``},
+ {`\\\host\share`, ``},
+ {`\\\host\\share`, ``},
+ {`\\host`, ``},
+ {`//host`, ``},
+ {`\\host\`, ``},
+ {`//host/`, ``},
+ {`\\host\share`, `\\host\share`},
+ {`//host/share`, `//host/share`},
+ {`\\host\share\`, `\\host\share`},
+ {`//host/share/`, `//host/share`},
+ {`\\host\share\foo`, `\\host\share`},
+ {`//host/share/foo`, `//host/share`},
+ {`\\host\share\\foo\\\bar\\\\baz`, `\\host\share`},
+ {`//host/share//foo///bar////baz`, `//host/share`},
+ {`\\host\share\foo\..\bar`, `\\host\share`},
+ {`//host/share/foo/../bar`, `//host/share`},
+}
+
+func TestVolumeName(t *testing.T) {
+ if runtime.GOOS != "windows" {
+ return
+ }
+ for _, v := range volumenametests {
+ if vol := filepath.VolumeName(v.path); vol != v.vol {
+ t.Errorf("VolumeName(%q)=%q, want %q", v.path, vol, v.vol)
+ }
+ }