change Readdir test to work, update Fs and File interface in README

Readdir test worked on OS X but not on CI, because the assumption that the os.File Readdir returns files sorted by name is not true on all operating systems

README.md

@@ -100,8 +100,10 @@ the ability to drop in other filesystems as desired.
 Then throughout your functions and methods use the methods familiar
 already from the OS package.
 
-Methods Available:
+File System Methods Available:
 
+       Chmod(name string, mode os.FileMode) : error
+       Chtimes(name string, atime time.Time, mtime time.Time) : error
        Create(name string) : File, error
        Mkdir(name string, perm os.FileMode) : error
        MkdirAll(path string, perm os.FileMode) : error
@@ -113,6 +115,22 @@ Methods Available:
        Rename(oldname, newname string) : error
        Stat(name string) : os.FileInfo, error
 
+File Interfaces and Methods Available:
+
+       io.Closer
+       io.Reader
+       io.ReaderAt
+       io.Seeker
+       io.Writer
+       io.WriterAt
+
+       Stat() : os.FileInfo, error
+       Readdir(count int) : []os.FileInfo, error
+       Readdirnames(n int) : []string, error
+       WriteString(s string) : ret int, err error
+       Truncate(size int64) : error
+       Name() : string
+
 In our case we would call `AppFs.Open()` as an example because that is how we’ve defined to
 access our filesystem.
 

fs_test.go

@@ -362,6 +362,7 @@ func TestReaddirSimple(t *testing.T) {
 func TestReaddir(t *testing.T) {
 	for num := 0; num < 6; num++ {
 		outputs := make([]string, len(Fss))
+		infos := make([]string, len(Fss))
 		for i, fs := range Fss {
 			root, err := fs.Open(testSubDir)
 			if err != nil {
@@ -370,15 +371,16 @@ func TestReaddir(t *testing.T) {
 			for j := 0; j < 6; j++ {
 				info, err := root.Readdir(num)
 				outputs[i] += fmt.Sprintf("%v  Error: %v\n", myFileInfo(info), err)
+				infos[i] += fmt.Sprintln(len(info), err)
 			}
 		}
 
 		fail := false
-		for i, o := range outputs {
+		for i, o := range infos {
 			if i == 0 {
 				continue
 			}
-			if o != outputs[i-1] {
+			if o != infos[i-1] {
 				fail = true
 				break
 			}