Better NewOCIPusher test, add ORAS link

Signed-off-by: Josh Dolitsky <josh@dolit.ski>

cmd/helm/registry_login.go

@@ -68,7 +68,7 @@ func newRegistryLoginCmd(cfg *action.Configuration, out io.Writer) *cobra.Comman
 	return cmd
 }
 
-// Adapted from the ORAS project
+// Adapted from https://github.com/oras-project/oras
 func getUsernamePassword(usernameOpt string, passwordOpt string, passwordFromStdinOpt bool) (string, string, error) {
 	var err error
 	username := usernameOpt
@@ -111,7 +111,7 @@ func getUsernamePassword(usernameOpt string, passwordOpt string, passwordFromStd
 	return username, password, nil
 }
 
-// Copied/adapted from the ORAS project
+// Copied/adapted from https://github.com/oras-project/oras
 func readLine(prompt string, silent bool) (string, error) {
 	fmt.Print(prompt)
 	if silent {

internal/experimental/pusher/ocipusher_test.go

@@ -26,5 +26,11 @@ func TestNewOCIPusher(t *testing.T) {
 		}
 	}
 
-	NewOCIPusher(testfn)
+	p, err := NewOCIPusher(testfn)
+	if p == nil {
+		t.Error("NewOCIPusher returned nil")
+	}
+	if err != nil {
+		t.Error(err)
+	}
 }