his suntan lotion and his castanets

pkging/costello/costello.go

@@ -14,8 +14,9 @@ func All(t *testing.T, fn AllFn) {
 	type tf func(*testing.T, pkging.Pkger)
 
 	tests := map[string]tf{
-		"OpenTest": OpenTest,
-		"StatTest": StatTest,
+		"OpenTest":   OpenTest,
+		"StatTest":   StatTest,
+		"CreateTest": CreateTest,
 	}
 
 	ref, err := NewRef()

pkging/costello/create.go

@@ -1,11 +1,48 @@
 package costello
 
 import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/markbates/pkger/pkging"
+	"github.com/stretchr/testify/require"
 )
 
-func Create_Test(t *testing.T, pkg pkging.Pkger) error {
-	return nil
+func CreateTest(t *testing.T, pkg pkging.Pkger) {
+	r := require.New(t)
+
+	ref, err := NewRef()
+	r.NoError(err)
+
+	const name = "create.test"
+
+	fp := filepath.Join(ref.Dir, name)
+	os.RemoveAll(fp)
+	defer os.RemoveAll(fp)
+
+	_, err = os.Stat(fp)
+	r.Error(err)
+
+	_, err = pkg.Stat(name)
+	r.Error(err)
+
+	data := []byte(strings.ToUpper(name))
+
+	osf, err := os.Create(fp)
+	r.NoError(err)
+
+	_, err = osf.Write(data)
+	r.NoError(err)
+	r.NoError(osf.Close())
+
+	psf, err := pkg.Create(fmt.Sprintf("/%s", name))
+	r.NoError(err)
+
+	_, err = psf.Write(data)
+	r.NoError(err)
+	r.NoError(psf.Close())
+	openTest(name, t, pkg)
 }

pkging/costello/open.go

@@ -1,6 +1,7 @@
 package costello
 
 import (
+	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -12,12 +13,16 @@ import (
 )
 
 func OpenTest(t *testing.T, pkg pkging.Pkger) {
+	openTest("go.mod", t, pkg)
+}
+
+func openTest(name string, t *testing.T, pkg pkging.Pkger) {
 	r := require.New(t)
 
 	ref, err := NewRef()
 	r.NoError(err)
 
-	osf, err := os.Open(filepath.Join(ref.Dir, "go.mod"))
+	osf, err := os.Open(filepath.Join(ref.Dir, name))
 	r.NoError(err)
 
 	osi, err := osf.Stat()
@@ -29,7 +34,7 @@ func OpenTest(t *testing.T, pkg pkging.Pkger) {
 
 	r.NoError(LoadRef(ref, pkg))
 
-	pf, err := pkg.Open("/go.mod")
+	pf, err := pkg.Open(fmt.Sprintf("/%s", name))
 	r.NoError(err)
 
 	psi, err := pf.Stat()

pkging/mem/create_test.go

@@ -0,0 +1,20 @@
+package mem
+
+import (
+	"testing"
+
+	"github.com/markbates/pkger/pkging/costello"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_Pkger_Create(t *testing.T) {
+	r := require.New(t)
+
+	ref, err := costello.NewRef()
+	r.NoError(err)
+
+	pkg, err := New(ref.Info)
+	r.NoError(err)
+
+	costello.CreateTest(t, pkg)
+}