kubernetes/pkg/controller/volume/persistentvolume/binder_test.go

// Test single call to syncClaim and syncVolume methods.
//  1. Fill in the controller with initial data
//  2. Call the tested function (syncClaim/syncVolume) via
//     controllerTest.testCall *once*.
//  3. Compare resulting volumes and claims with expected volumes and claims.
func TestSync(t *testing.T) { … }

func TestSyncBlockVolume(t *testing.T) { … }

// Test multiple calls to syncClaim/syncVolume and periodic sync of all
// volume/claims. The test follows this pattern:
//  0. Load the controller with initial data.
//  1. Call controllerTest.testCall() once as in TestSync()
//  2. For all volumes/claims changed by previous syncVolume/syncClaim calls,
//     call appropriate syncVolume/syncClaim (simulating "volume/claim changed"
//     events). Go to 2. if these calls change anything.
//  3. When all changes are processed and no new changes were made, call
//     syncVolume/syncClaim on all volumes/claims (simulating "periodic sync").
//  4. If some changes were done by step 3., go to 2. (simulation of
//     "volume/claim updated" events, eventually performing step 3. again)
//  5. When 3. does not do any changes, finish the tests and compare final set
//     of volumes/claims with expected claims/volumes and report differences.
//
// Some limit of calls in enforced to prevent endless loops.
func TestMultiSync(t *testing.T) { … }