test: add unit tests for the expiration date function

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

docs/usage/customization-guide.md

@@ -313,11 +313,13 @@ The label value defaults to `true`, if not specified.
 
 Label namespace may be specified with `<namespace>/<name>[=<value>]`.
 
-You can include the following block if you want to define the expiration date 
+You can include the following block if you want to define the expiration date
 of features that are described in the feature files:
+
 ```plaintext
 # +expiry-time: 2023-07-29T11:22:33Z
 ```
+
 **Note: The time format that we are supporting is RFC3339.**
 
 ### Mounts

source/local/local.go

@@ -282,6 +282,7 @@ func getFeaturesFromFiles() (map[string]string, error) {
 		}
 
 		if expiryDate.Before(time.Now()) {
+			klog.InfoS("feature file is expired", "fileName", fileName)
 			continue
 		}
 
@@ -304,9 +305,9 @@ func getExpirationDate(lines [][]byte) (time.Time, error) {
 			lineSplit := strings.SplitN(string(line), ":", 2)
 
 			key := lineSplit[0]
-
 			if key == ExpiryDateKey {
-				expiryDate, err := time.Parse(time.RFC3339, lineSplit[1])
+				expiryDate, err := time.Parse(time.RFC3339, strings.TrimSpace(lineSplit[1]))
+				fmt.Println(err)
 				if err != nil {
 					return time.Now(), err
 				}

source/local/local_test.go

@@ -17,7 +17,9 @@ limitations under the License.
 package local
 
 import (
+	"fmt"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -33,3 +35,22 @@ func TestLocalSource(t *testing.T) {
 	assert.Empty(t, l)
 
 }
+
+func TestGetExpirationDate(t *testing.T) {
+
+	expectedDate := "2023-07-28T11:22:33Z"
+	fileContent := []string{
+		fmt.Sprintf("# +expiry-time: %v", expectedDate),
+		"featureKey=featureValue",
+	}
+
+	fileContentByte := [][]byte{}
+
+	for _, content := range fileContent {
+		fileContentByte = append(fileContentByte, []byte(content))
+	}
+
+	expirationDate, err := getExpirationDate(fileContentByte)
+	assert.Nil(t, err)
+	assert.Equal(t, expirationDate.Format(time.RFC3339), expectedDate)
+}