// TestSyncScheduleInfoToCacheNodes tests the behavior of the SyncScheduleInfoToCacheNodes method 
// for AlluxioEngine, ensuring it correctly labels Kubernetes nodes based on pod scheduling.
//
// This test covers multiple scenarios:
// - "create": Ensures labels are added to nodes where pods are scheduled.
// - "add": Verifies label addition when new pods/nodes are involved.
// - "noController": Checks behavior when pods lack a controller reference (should not label).
// - "deprecated": Tests legacy deployment via DaemonSet and ensures no labels are added.
//
// The test sets up a fake Kubernetes client populated with a combination of StatefulSets,
// DaemonSets, Pods, and Nodes for each test case. It invokes SyncScheduleInfoToCacheNodes()
// and validates that node labels are correctly synchronized with expected node names.
// Discrepancies between expected and actual labeled nodes trigger test failures.