Checking in vendor folder for ease of using go get.

vendor/github.com/spf13/afero/copyOnWriteFs_test.go

@@ -0,0 +1,40 @@
+package afero
+
+import "testing"
+
+func TestCopyOnWrite(t *testing.T) {
+	var fs Fs
+	var err error
+	base := NewOsFs()
+	roBase := NewReadOnlyFs(base)
+	ufs := NewCopyOnWriteFs(roBase, NewMemMapFs())
+
+	fs = ufs
+	err = fs.MkdirAll("nonexistent/directory/", 0744)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	_, err = fs.Create("nonexistent/directory/newfile")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+}
+
+func TestCopyOnWriteFileInMemMapBase(t *testing.T) {
+	base := &MemMapFs{}
+	layer := &MemMapFs{}
+
+	if err := WriteFile(base, "base.txt", []byte("base"), 0755); err != nil {
+		t.Fatalf("Failed to write file: %s", err)
+	}
+
+	ufs := NewCopyOnWriteFs(base, layer)
+
+	_, err := ufs.Stat("base.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+}