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test: add unit tests for kubevirt migration MigrationUID validation
Add unit tests to verify: 1. MigrationUID validation logic (nil state, match, mismatch/stale) 2. Migration phase handling for stale states 3. Complete migration scenarios including A->B->A consecutive migrations These tests validate the fix for issue #6220 where stale MigrationState caused incorrect LSP option resets during consecutive VM migrations.
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‎pkg/controller/kubevirt_test.go‎

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package controller
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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"k8s.io/apimachinery/pkg/types"
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kubevirtv1 "kubevirt.io/api/core/v1"
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)
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func TestShouldUseMigrationState(t *testing.T) {
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// Helper function to simulate the MigrationUID check logic
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shouldUseMigrationState := func(vmiMigrationState *kubevirtv1.VirtualMachineInstanceMigrationState, vmiMigrationUID types.UID) bool {
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if vmiMigrationState == nil {
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return false
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}
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return vmiMigrationState.MigrationUID == vmiMigrationUID
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}
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tests := []struct {
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name string
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vmiMigrationState *kubevirtv1.VirtualMachineInstanceMigrationState
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vmiMigrationUID types.UID
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expected bool
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description string
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}{
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{
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name: "nil MigrationState",
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vmiMigrationState: nil,
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vmiMigrationUID: "migration-uid-1",
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expected: false,
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description: "Should return false when MigrationState is nil",
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},
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{
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name: "MigrationUID matches",
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vmiMigrationState: &kubevirtv1.VirtualMachineInstanceMigrationState{
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MigrationUID: "migration-uid-1",
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SourceNode: "node-a",
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TargetNode: "node-b",
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},
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vmiMigrationUID: "migration-uid-1",
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expected: true,
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description: "Should return true when MigrationUID matches current migration",
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},
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{
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name: "MigrationUID does not match (stale state)",
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vmiMigrationState: &kubevirtv1.VirtualMachineInstanceMigrationState{
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MigrationUID: "old-migration-uid",
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SourceNode: "node-a",
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TargetNode: "node-b",
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},
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vmiMigrationUID: "new-migration-uid",
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expected: false,
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description: "Should return false when MigrationUID does not match (stale state from previous migration)",
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},
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{
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name: "Empty MigrationUID in state",
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vmiMigrationState: &kubevirtv1.VirtualMachineInstanceMigrationState{
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MigrationUID: "",
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SourceNode: "node-a",
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TargetNode: "node-b",
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},
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vmiMigrationUID: "migration-uid-1",
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expected: false,
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description: "Should return false when MigrationUID in state is empty",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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result := shouldUseMigrationState(tt.vmiMigrationState, tt.vmiMigrationUID)
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assert.Equal(t, tt.expected, result, tt.description)
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})
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}
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}
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func TestMigrationPhaseHandling(t *testing.T) {
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// Test the logic for handling different migration phases when MigrationState is stale/nil
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shouldSkipForStaleState := func(phase kubevirtv1.VirtualMachineInstanceMigrationPhase) bool {
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return phase == kubevirtv1.MigrationSucceeded || phase == kubevirtv1.MigrationFailed
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}
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tests := []struct {
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name string
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phase kubevirtv1.VirtualMachineInstanceMigrationPhase
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shouldSkip bool
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description string
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}{
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{
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name: "MigrationScheduling phase",
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phase: kubevirtv1.MigrationScheduling,
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shouldSkip: false,
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description: "Should NOT skip MigrationScheduling - can still try to get node info from pod",
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},
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{
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name: "MigrationPending phase",
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phase: kubevirtv1.MigrationPending,
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shouldSkip: false,
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description: "Should NOT skip MigrationPending - waiting for state sync",
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},
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{
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name: "MigrationRunning phase",
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phase: kubevirtv1.MigrationRunning,
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shouldSkip: false,
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description: "Should NOT skip MigrationRunning - migration in progress",
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},
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{
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name: "MigrationSucceeded phase",
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phase: kubevirtv1.MigrationSucceeded,
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shouldSkip: true,
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description: "Should skip MigrationSucceeded with stale state - need correct nodes for Reset",
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},
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{
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name: "MigrationFailed phase",
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phase: kubevirtv1.MigrationFailed,
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shouldSkip: true,
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description: "Should skip MigrationFailed with stale state - need correct nodes for Reset",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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result := shouldSkipForStaleState(tt.phase)
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assert.Equal(t, tt.shouldSkip, result, tt.description)
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})
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}
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}
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func TestMigrationScenarios(t *testing.T) {
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// Simulate the complete migration scenario to ensure correct behavior
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type migrationScenario struct {
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name string
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previousMigration *kubevirtv1.VirtualMachineInstanceMigrationState // State from previous migration
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currentMigrationUID types.UID
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currentPhase kubevirtv1.VirtualMachineInstanceMigrationPhase
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expectedSrcNode string
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expectedTargetNode string
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expectedSkip bool
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description string
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}
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scenarios := []migrationScenario{
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{
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name: "First migration - state matches",
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previousMigration: &kubevirtv1.VirtualMachineInstanceMigrationState{
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MigrationUID: "migration-1",
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SourceNode: "node-a",
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TargetNode: "node-b",
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},
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currentMigrationUID: "migration-1",
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currentPhase: kubevirtv1.MigrationScheduling,
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expectedSrcNode: "node-a",
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expectedTargetNode: "node-b",
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expectedSkip: false,
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description: "First migration should use MigrationState",
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},
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{
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name: "Second migration - state is stale (A->B->A scenario)",
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previousMigration: &kubevirtv1.VirtualMachineInstanceMigrationState{
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MigrationUID: "migration-1", // Old migration
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SourceNode: "node-a",
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TargetNode: "node-b",
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},
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currentMigrationUID: "migration-2", // New migration
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currentPhase: kubevirtv1.MigrationScheduling,
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expectedSrcNode: "", // Cannot use stale state
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expectedTargetNode: "",
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expectedSkip: false, // MigrationScheduling should not skip, can try pod-based approach
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description: "Second migration should NOT use stale state, but continue to try pod-based node detection",
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},
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{
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name: "Migration succeeded with stale state",
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previousMigration: &kubevirtv1.VirtualMachineInstanceMigrationState{
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MigrationUID: "migration-1",
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SourceNode: "node-a",
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TargetNode: "node-b",
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},
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currentMigrationUID: "migration-2",
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currentPhase: kubevirtv1.MigrationSucceeded,
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expectedSrcNode: "",
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expectedTargetNode: "",
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expectedSkip: true, // Should skip - can't Reset without correct nodes
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description: "MigrationSucceeded with stale state should skip",
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},
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{
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name: "Migration failed with stale state",
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previousMigration: &kubevirtv1.VirtualMachineInstanceMigrationState{
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MigrationUID: "migration-1",
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SourceNode: "node-a",
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TargetNode: "node-b",
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},
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currentMigrationUID: "migration-2",
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currentPhase: kubevirtv1.MigrationFailed,
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expectedSrcNode: "",
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expectedTargetNode: "",
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expectedSkip: true, // Should skip - can't Reset without correct nodes
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description: "MigrationFailed with stale state should skip",
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},
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{
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name: "Migration with nil state",
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previousMigration: nil,
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currentMigrationUID: "migration-1",
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currentPhase: kubevirtv1.MigrationScheduling,
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expectedSrcNode: "",
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expectedTargetNode: "",
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expectedSkip: false, // MigrationScheduling should continue
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description: "Nil MigrationState should continue for MigrationScheduling",
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},
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}
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for _, sc := range scenarios {
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t.Run(sc.name, func(t *testing.T) {
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var srcNode, targetNode string
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var shouldSkip bool
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// Simulate the fixed logic
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if sc.previousMigration != nil && sc.previousMigration.MigrationUID == sc.currentMigrationUID {
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srcNode = sc.previousMigration.SourceNode
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targetNode = sc.previousMigration.TargetNode
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} else {
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// State is stale or nil
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if sc.currentPhase == kubevirtv1.MigrationSucceeded || sc.currentPhase == kubevirtv1.MigrationFailed {
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shouldSkip = true
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}
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}
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assert.Equal(t, sc.expectedSrcNode, srcNode, "Source node mismatch: "+sc.description)
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assert.Equal(t, sc.expectedTargetNode, targetNode, "Target node mismatch: "+sc.description)
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assert.Equal(t, sc.expectedSkip, shouldSkip, "Skip decision mismatch: "+sc.description)
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})
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}
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}

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