diff --git a/pkg/ddc/alluxio/operations/base_test.go b/pkg/ddc/alluxio/operations/base_test.go
index dc1b3c3f69b..1f3fd4ed795 100644
--- a/pkg/ddc/alluxio/operations/base_test.go
+++ b/pkg/ddc/alluxio/operations/base_test.go
@@ -479,6 +479,14 @@ func TestAlluxioFileUtils_Ready(t *testing.T) {
 	}
 }
 
+// TestAlluxioFIleUtils_Du tests the Du method of AlluxioFileUtils.
+// It verifies that the method returns an error when command execution fails
+// and correctly parses the file size, cached size, and cached percentage
+// when the command succeeds.
+//
+// Test cases:
+// - command execution returns an error
+// - command execution succeeds and du output is parsed correctly
 func TestAlluxioFIleUtils_Du(t *testing.T) {
 	ExecCommon := func(a AlluxioFileUtils, command []string, verbose bool) (stdout string, stderr string, err error) {
 		return "File Size     In Alluxio       Path\n577575561     0 (0%)           /hbase", "", nil