test(entities): adds test cases to test errors with reserved keys mod…

…ified in entity tags (#1188)

pkg/entities/tags_integration_test.go

@@ -4,9 +4,9 @@
 package entities
 
 import (
-	"testing"
-
 	"github.com/stretchr/testify/require"
+	"regexp"
+	"testing"
 
 	"github.com/newrelic/newrelic-client-go/v2/pkg/common"
 	"github.com/newrelic/newrelic-client-go/v2/pkg/testhelpers"
@@ -61,6 +61,7 @@ func TestIntegrationTaggingAddTagsToEntityAndGetTags(t *testing.T) {
 
 	require.NoError(t, err)
 	require.Greater(t, len(actual), 0)
+
 }
 
 func TestIntegrationTaggingReplaceTagsOnEntity(t *testing.T) {
@@ -83,6 +84,7 @@ func TestIntegrationTaggingReplaceTagsOnEntity(t *testing.T) {
 	require.NoError(t, err)
 	require.NotNil(t, result)
 	require.Equal(t, 0, len(result.Errors))
+
 }
 
 func TestIntegrationDeleteTags(t *testing.T) {
@@ -123,3 +125,39 @@ func TestIntegrationDeleteTagValues(t *testing.T) {
 	require.NotNil(t, result)
 	require.Equal(t, 0, len(result.Errors))
 }
+
+func TestIntegrationEntityTagsReservedKeysMutation(t *testing.T) {
+	t.Parallel()
+
+	var (
+		testGUID = common.EntityGUID(testhelpers.IntegrationTestApplicationEntityGUID)
+	)
+
+	client := newIntegrationTestClient(t)
+
+	// Test: To add a reserved key(immutable key)
+	tags := []TaggingTagInput{
+		{
+			Key:    "account",
+			Values: []string{"Random-name"},
+		},
+	}
+	result, err := client.TaggingAddTagsToEntity(testGUID, tags)
+	require.NoError(t, err)
+	require.NotNil(t, result)
+	require.Greater(t, len(result.Errors), 0)
+	message := result.Errors[0].Message
+	match, er := regexp.MatchString("reserved", message)
+	require.NoError(t, er)
+	require.True(t, match)
+
+	// Test: To update a reserved key(immutable key)
+	result, err = client.TaggingReplaceTagsOnEntity(testGUID, tags)
+	require.NoError(t, err)
+	require.NotNil(t, result)
+	require.Greater(t, len(result.Errors), 0)
+	message = result.Errors[0].Message
+	match, er = regexp.MatchString("reserved", message)
+	require.NoError(t, er)
+	require.True(t, match)
+}