Overlay file system
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2.3 KiB

package overlay
import (
"embed"
"io/fs"
"os"
"strings"
"testing"
)
//go:embed _test/embed
var embedded embed.FS
func TestMain(m *testing.M) {
os.Exit(m.Run())
}
func TestOverlay(t *testing.T) {
tt := []struct {
Name string
File string
Expected string
}{
{
Name: "Embed",
File: "test1.txt",
Expected: "test1",
},
{
Name: "Disk",
File: "test2.txt",
Expected: "test3",
},
}
x, err := New("_test/disk", embedded, WithSub("_test/embed"), WithCaching(false))
if err != nil {
t.Log(err)
t.FailNow()
}
for _, tc := range tt {
t.Run(tc.Name, func(t *testing.T) {
fi, err := x.Open(tc.File)
if err != nil {
t.Log(err)
t.FailNow()
}
defer fi.Close()
contents, err := x.ReadFile(tc.File)
if err != nil {
t.Log(err)
t.FailNow()
}
if !strings.EqualFold(string(contents), tc.Expected) {
t.Logf("fs did not match:\n\tgot: %s\n\texpected: %s\n", string(contents), tc.Expected)
t.FailNow()
}
})
}
}
func TestWalk(t *testing.T) {
expected := []string{"test1.txt", "test2.txt"}
x, err := New("_test/disk", embedded, WithSub("_test/embed"), WithCaching(false))
if err != nil {
t.Log(err)
t.FailNow()
}
found := make([]string, 0)
if err := fs.WalkDir(x, ".", func(walkPath string, walkEntry fs.DirEntry, walkErr error) error {
if walkErr != nil {
return walkErr
}
if walkEntry.IsDir() {
return nil
}
found = append(found, walkEntry.Name())
return nil
}); err != nil {
t.Log(err)
t.FailNow()
}
for _, e := range expected {
exists := false
for _, f := range found {
if e == f {
exists = true
break
}
}
if !exists {
t.Logf("could not find %s in %s\n", e, found)
t.Fail()
}
}
}
var emptyFS embed.FS
func TestInvalid(t *testing.T) {
_, err := New("/var/lib/myapp/assets/custom", emptyFS)
if err != nil {
t.Log("invalid FS should not error explicitly")
t.FailNow()
}
}
func BenchmarkCache(b *testing.B) {
x, err := New("_test/disk", embedded)
if err != nil {
b.Log(err)
b.FailNow()
}
for idx := 0; idx < b.N; idx++ {
x.exists("test2.txt")
}
}
func BenchmarkNoCache(b *testing.B) {
x, err := New("_test/disk", embedded, WithCaching(false))
if err != nil {
b.Log(err)
b.FailNow()
}
for idx := 0; idx < b.N; idx++ {
x.exists("test2.txt")
}
}