swarm/pss: negihbourhood addressing simulation tests (#19278)

* swarm/pss: fixed bug in pss.process, test added

* swarm/pss: test case updated

* swarm/pss: WaitTillSnapshotRecreated() func added

* swarm/pss: snapshot test updated

* swarm/pss: WaitTillSnapshotLoaded() fixed

* swarm/pss: gofmt applied

* swarm/pss: refactoring, file renamed

* swarm/pss: input data fixed

* swarm/pss: race condition fixed

* swarm/pss: test timeout increased

* swarm/pss: eliminated the global variables

* swarm/pss: tests added

* swarm/pss: comments added

* swarm/pss: comment fixed

* swarm/pss: refactored according to review

* swarm/pss: style fix

* swarm/pss: increased timeout

swarm/network/simulation/kademlia_test.go

@@ -144,3 +144,166 @@ func createSimServiceMap(discovery bool) map[string]ServiceFunc {
 		},
 	}
 }
+
+// TestWaitTillSnapshotRecreated tests that we indeed have a network
+// configuration specified in the snapshot file, after we wait for it.
+//
+// First we create a first simulation
+// Run it as nodes connected in a ring
+// Wait until the network is healthy
+// Then we create a snapshot
+// With this snapshot we create a new simulation
+// Call WaitTillSnapshotRecreated() function and wait until it returns
+// Iterate the nodes and check if all the connections are successfully recreated
+func TestWaitTillSnapshotRecreated(t *testing.T) {
+	var err error
+	sim := New(createSimServiceMap(true))
+	_, err = sim.AddNodesAndConnectRing(16)
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+	defer cancel()
+	_, err = sim.WaitTillHealthy(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	originalConnections := sim.getActualConnections()
+	snap, err := sim.Net.Snapshot()
+	sim.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	controlSim := New(createSimServiceMap(false))
+	defer controlSim.Close()
+	err = controlSim.Net.Load(snap)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = controlSim.WaitTillSnapshotRecreated(ctx, *snap)
+	if err != nil {
+		t.Fatal(err)
+	}
+	controlConnections := controlSim.getActualConnections()
+
+	for _, c := range originalConnections {
+		if !exist(controlConnections, c) {
+			t.Fatal("connection was not recreated")
+		}
+	}
+}
+
+// exist returns true if val is found in arr
+func exist(arr []uint64, val uint64) bool {
+	for _, c := range arr {
+		if c == val {
+			return true
+		}
+	}
+	return false
+}
+
+func TestRemoveDuplicatesAndSingletons(t *testing.T) {
+	singletons := []uint64{
+		0x3c127c6f6cb026b0,
+		0x0f45190d72e71fc5,
+		0xb0184c02449e0bb6,
+		0xa85c7b84239c54d3,
+		0xe3b0c44298fc1c14,
+		0x9afbf4c8996fb924,
+		0x27ae41e4649b934c,
+		0xa495991b7852b855,
+	}
+
+	doubles := []uint64{
+		0x1b879f878de7fc7a,
+		0xc6791470521bdab4,
+		0xdd34b0ee39bbccc6,
+		0x4d904fbf0f31da10,
+		0x6403c2560432c8f8,
+		0x18954e33cf3ad847,
+		0x90db00e98dc7a8a6,
+		0x92886b0dfcc1809b,
+	}
+
+	var arr []uint64
+	arr = append(arr, doubles...)
+	arr = append(arr, singletons...)
+	arr = append(arr, doubles...)
+	arr = removeDuplicatesAndSingletons(arr)
+
+	for _, i := range singletons {
+		if exist(arr, i) {
+			t.Fatalf("singleton not removed: %d", i)
+		}
+	}
+
+	for _, i := range doubles {
+		if !exist(arr, i) {
+			t.Fatalf("wrong value removed: %d", i)
+		}
+	}
+
+	for j := 0; j < len(doubles); j++ {
+		v := doubles[j] + singletons[j]
+		if exist(arr, v) {
+			t.Fatalf("non-existing value found, index: %d", j)
+		}
+	}
+}
+
+func TestIsAllDeployed(t *testing.T) {
+	a := []uint64{
+		0x3c127c6f6cb026b0,
+		0x0f45190d72e71fc5,
+		0xb0184c02449e0bb6,
+		0xa85c7b84239c54d3,
+		0xe3b0c44298fc1c14,
+		0x9afbf4c8996fb924,
+		0x27ae41e4649b934c,
+		0xa495991b7852b855,
+	}
+
+	b := []uint64{
+		0x1b879f878de7fc7a,
+		0xc6791470521bdab4,
+		0xdd34b0ee39bbccc6,
+		0x4d904fbf0f31da10,
+		0x6403c2560432c8f8,
+		0x18954e33cf3ad847,
+		0x90db00e98dc7a8a6,
+		0x92886b0dfcc1809b,
+	}
+
+	var c []uint64
+	c = append(c, a...)
+	c = append(c, b...)
+
+	if !isAllDeployed(a, c) {
+		t.Fatal("isAllDeployed failed")
+	}
+
+	if !isAllDeployed(b, c) {
+		t.Fatal("isAllDeployed failed")
+	}
+
+	if isAllDeployed(c, a) {
+		t.Fatal("isAllDeployed failed: false positive")
+	}
+
+	if isAllDeployed(c, b) {
+		t.Fatal("isAllDeployed failed: false positive")
+	}
+
+	c = c[2:]
+
+	if isAllDeployed(a, c) {
+		t.Fatal("isAllDeployed failed: false positive")
+	}
+
+	if !isAllDeployed(b, c) {
+		t.Fatal("isAllDeployed failed")
+	}
+}