package atlas import ( "path/filepath" "testing" ) func TestLongestCommonPrefix(t *testing.T) { sep := string(filepath.Separator) cases := []struct { Input []string Output string }{ { []string{"foo", "bar"}, "", }, { []string{"foo", "foobar"}, "", }, { []string{"foo" + sep, "foo" + sep + "bar"}, "foo" + sep, }, { []string{sep + "foo" + sep, sep + "bar"}, sep, }, } for _, tc := range cases { actual := longestCommonPrefix(tc.Input) if actual != tc.Output { t.Fatalf("bad: %#v\n\n%#v", actual, tc.Input) } } }