add unit test

Author: Liujingfang1

cmd/flagutils/utils_test.go

@@ -0,0 +1,48 @@
+// Copyright 2021 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package flagutils
+
+import (
+	"fmt"
+	"testing"
+
+	"sigs.k8s.io/cli-utils/pkg/inventory"
+)
+
+func TestConvertInventoryPolicy(t *testing.T) {
+	testcases := []struct {
+		value  string
+		policy inventory.InventoryPolicy
+		err    error
+	}{
+		{
+			value:  "strict",
+			policy: inventory.InventoryPolicyMustMatch,
+		},
+		{
+			value:  "adopt",
+			policy: inventory.AdoptIfNoInventory,
+		},
+		{
+			value: "random",
+			err:   fmt.Errorf("inventory policy must be one of strict, adopt"),
+		},
+	}
+	for _, tc := range testcases {
+		t.Run(tc.value, func(t *testing.T) {
+			policy, err := ConvertInventoryPolicy(tc.value)
+			if tc.err == nil {
+				if err != nil {
+					t.Errorf("unexpected error %v", err)
+				}
+				if policy != tc.policy {
+					t.Errorf("expected %v but got %v", policy, tc.policy)
+				}
+			}
+			if err == nil && tc.err != nil {
+				t.Errorf("expected an error, but not happened")
+			}
+		})
+	}
+}