}
		// This section overwrites an existing plugins list entry for istio-cni
		existingCNIConfig, err := os.ReadFile(cniConfigFilepath)
		if err != nil {
			return "", err
		}
		cniConfig, err = insertCNIConfig(cniConfig, existingCNIConfig)
		if err != nil {
			return "", err
		}
	}

	if err = file.AtomicWrite(cniConfigFilepath, cniConfig, os.FileMode(0o644)); err != nil {

			existingConfFilepath := filepath.Join("testdata", c.existingConfFilename)
			existingConf := testutils.ReadFile(t, existingConfFilepath)

			output, err := insertCNIConfig(istioConf, existingConf)
			if err != nil {
				if !c.expectedFailure {
					t.Fatal(err)
				}
				return
			}

			goldenFilepath := existingConfFilepath + ".golden"