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|
package memfs
import (
"errors"
"fmt"
"io"
"io/fs"
"testing"
"testing/fstest"
"github.com/google/go-cmp/cmp"
)
func TestFS(t *testing.T) {
rootFS := New()
err := rootFS.MkdirAll("foo/bar", 0o777)
if err != nil {
t.Fatal(err)
}
err = rootFS.WriteFile("foo/bar/buz.txt", []byte("buz"), 0o777)
if err != nil {
t.Fatal(err)
}
err = fstest.TestFS(rootFS, "foo/bar/buz.txt")
if err != nil {
t.Fatal(err)
}
}
func TestMemFS(t *testing.T) {
rootFS := New()
err := rootFS.MkdirAll("foo/bar", 0o777)
if err != nil {
t.Fatal(err)
}
var gotPaths []string
err = fs.WalkDir(rootFS, ".", func(path string, d fs.DirEntry, err error) error {
gotPaths = append(gotPaths, path)
if !d.IsDir() {
return fmt.Errorf("%s is not a directory", path)
}
return nil
})
if err != nil {
t.Fatal(err)
}
expectPaths := []string{
".",
"foo",
"foo/bar",
}
if diff := cmp.Diff(expectPaths, gotPaths); diff != "" {
t.Fatalf("WalkDir mismatch %s", diff)
}
err = rootFS.WriteFile("foo/baz/buz.txt", []byte("buz"), 0o777)
if err == nil && errors.Is(err, fs.ErrNotExist) {
t.Fatalf("Expected missing directory error but got none")
}
_, err = fs.ReadFile(rootFS, "foo/baz/buz.txt")
if err == nil && errors.Is(err, fs.ErrNotExist) {
t.Fatal("Expected no such file but got no error")
}
body := []byte("baz")
err = rootFS.WriteFile("foo/bar/baz.txt", body, 0o777)
if err != nil {
t.Fatal(err)
}
gotBody, err := fs.ReadFile(rootFS, "foo/bar/baz.txt")
if err != nil {
t.Fatal(err)
}
if diff := cmp.Diff(body, gotBody); diff != "" {
t.Fatalf("write/read baz.txt mismatch %s", diff)
}
subFS, err := rootFS.Sub("foo/bar")
if err != nil {
t.Fatal(err)
}
gotSubBody, err := fs.ReadFile(subFS, "baz.txt")
if err != nil {
t.Fatal(err)
}
if diff := cmp.Diff(body, gotSubBody); diff != "" {
t.Fatalf("write/read baz.txt mismatch %s", diff)
}
body = []byte("top_level_file")
err = rootFS.WriteFile("top_level_file.txt", body, 0o777)
if err != nil {
t.Fatalf("Write top_level_file error: %s", err)
}
gotBody, err = fs.ReadFile(rootFS, "top_level_file.txt")
if err != nil {
t.Fatalf("Read top_level_file error: %s", err)
}
if diff := cmp.Diff(body, gotBody); diff != "" {
t.Fatalf("write/read top_level_file.txt mismatch %s", diff)
}
}
func TestOpenHook(t *testing.T) {
openHook := func(path string, content []byte, origError error) ([]byte, error) {
if path == "foo/bar/override" {
return []byte("overriden content"), nil
}
return content, origError
}
rootFS := New(WithOpenHook(openHook))
err := rootFS.MkdirAll("foo/bar", 0o777)
if err != nil {
t.Fatal(err)
}
rootFS.WriteFile("foo/bar/f1", []byte("f1"), 0o777)
rootFS.WriteFile("foo/bar/override", []byte("orig content"), 0o777)
content, err := fs.ReadFile(rootFS, "foo/bar/f1")
if err != nil {
t.Fatal(err)
}
if diff := cmp.Diff(string(content), "f1"); diff != "" {
t.Fatalf("write/read roo/bar/f1 mismatch %s", diff)
}
content, err = fs.ReadFile(rootFS, "foo/bar/override")
if err != nil {
t.Fatal(err)
}
if diff := cmp.Diff(string(content), "overriden content"); diff != "" {
t.Fatalf("hook read mismatch %s", diff)
}
_, err = fs.ReadFile(rootFS, "foo/bar/non_existing_file")
if !errors.Is(err, fs.ErrNotExist) {
t.Fatalf("Expected ErrNotExist for non-existing file, got: %v", err)
}
}
func TestSeek(t *testing.T) {
rootFS := New()
err := rootFS.WriteFile("foo", []byte("0123456789"), 0o777)
if err != nil {
t.Fatal(err)
}
f, err := rootFS.Open("foo")
if err != nil {
t.Fatal(err)
}
seeker, ok := f.(io.Seeker)
if !ok {
t.Fatalf("File does not implement io.Seeker")
}
// Read first bytes.
bs := make([]byte, 3)
n, err := f.Read(bs)
if err != nil {
t.Fatal(err)
}
if n != 3 {
t.Fatalf("Expected 3 bytes read, got %d", n)
}
if diff := cmp.Diff(bs, []byte("012")); diff != "" {
t.Fatalf("read mismatch %s", diff)
}
// Read more bytes, make sure reader tracks.
n, err = f.Read(bs)
if err != nil {
t.Fatal(err)
}
if n != 3 {
t.Fatalf("Expected 3 bytes read, got %d", n)
}
if diff := cmp.Diff(bs, []byte("345")); diff != "" {
t.Fatalf("read mismatch %s", diff)
}
// Seek to beginning.
ofs, err := seeker.Seek(0, io.SeekStart)
if err != nil {
t.Fatal(err)
}
if ofs != 0 {
t.Fatalf("Expected offset 0, got %d", ofs)
}
// Read first bytes again.
n, err = f.Read(bs)
if err != nil {
t.Fatal(err)
}
if n != 3 {
t.Fatalf("Expected 3 bytes read, got %d", n)
}
if diff := cmp.Diff(bs, []byte("012")); diff != "" {
t.Fatalf("read mismatch %s", diff)
}
}
|
