// to the Go version except the Go version sets a negative Devminor
		// just to force the GNU format.
		file: "testdata/gnu-not-utf8.tar",
		headers: []*Header{{
			Name:     "hi\x80\x81\x82\x83bye",
			Mode:     0644,
			Uid:      1000,
			Gid:      1000,
			ModTime:  time.Unix(0, 0),
			Typeflag: '0',
			Uname:    "rawr",
			Gname:    "dsnet",
			Format:   FormatGNU,
		}},

			continue
		}
	}
	pred := func(c rune) bool { return c == 'X' }
	var fieldsFuncTests = []FieldsTest{
		{"", []string{}},
		{"XX", []string{}},
		{"XXhiXXX", []string{"hi"}},
		{"aXXbXXXcX", []string{"a", "b", "c"}},
	}
	for _, tt := range fieldsFuncTests {
		b := []byte(tt.s)
		a := FieldsFunc(b, pred)

		// Appending to the results should not change future results.