GC: Reduce the amount of folders upon restore (#637)

* Issue #595: All collections with the same `fullPath` name are to be stored within the same folder.

src/internal/connector/graph_connector.go

@@ -250,16 +250,18 @@ func (gc *GraphConnector) RestoreMessages(ctx context.Context, dcs []data.Collec
 	policy := control.Copy // TODO policy to be updated from external source after completion of refactoring
 
 	for _, dc := range dcs {
+		directory := strings.Join(dc.FullPath(), "")
 		user := dc.FullPath()[1]
 		items := dc.Items()
-		pathCounter[strings.Join(dc.FullPath(), "")] = true
+		if _, ok := pathCounter[directory]; !ok {
+			pathCounter[directory] = true
 			if policy == control.Copy {
 				folderID, errs = exchange.GetCopyRestoreFolder(&gc.graphService, user)
 				if errs != nil {
 					return errs
 				}
 			}
-
+		}
 		var exit bool
 		for !exit {
 			select {

src/internal/connector/graph_connector_test.go

@@ -224,15 +224,28 @@ func (suite *GraphConnectorIntegrationSuite) TestEventsSerializationRegression()
 }
 
 // TestRestoreMessages uses mock data to ensure GraphConnector
-// is able to restore a single messageable item to a Mailbox.
+// is able to restore a several messageable item to a Mailbox.
+// The result should be all successful items restored within the same folder.
 func (suite *GraphConnectorIntegrationSuite) TestRestoreMessages() {
-	user := tester.M365UserID(suite.T())
+	t := suite.T()
+	connector := loadConnector(t)
+	user := tester.M365UserID(t)
 	if len(user) == 0 {
 		suite.T().Skip("Environment not configured: missing m365 test user")
 	}
+
+	collection := make([]data.Collection, 0)
+	for i := 0; i < 3; i++ {
 		mdc := mockconnector.NewMockExchangeCollection([]string{"tenant", user, mailCategory, "Inbox"}, 1)
-	err := suite.connector.RestoreMessages(context.Background(), []data.Collection{mdc})
+		collection = append(collection, mdc)
+	}
+
+	err := connector.RestoreMessages(context.Background(), collection)
 	assert.NoError(suite.T(), err)
+	status := connector.AwaitStatus()
+	assert.NotNil(t, status)
+	assert.Equal(t, status.ObjectCount, status.Successful)
+	assert.Equal(t, status.FolderCount, 1)
 }
 
 // TestGraphConnector_SingleMailFolderCollectionQuery verifies single folder support

src/internal/connector/support/status.go

@@ -10,7 +10,7 @@ import (
 type ConnectorOperationStatus struct {
 	lastOperation    Operation
 	ObjectCount      int
-	folderCount      int
+	FolderCount      int
 	Successful       int
 	errorCount       int
 	incomplete       bool
@@ -42,7 +42,7 @@ func CreateStatus(
 	status := ConnectorOperationStatus{
 		lastOperation:    op,
 		ObjectCount:      objects,
-		folderCount:      folders,
+		FolderCount:      folders,
 		Successful:       success,
 		errorCount:       numErr,
 		incomplete:       hasErrors,
@@ -60,7 +60,7 @@ func CreateStatus(
 
 func (cos *ConnectorOperationStatus) String() string {
 	message := fmt.Sprintf("Action: %s performed on %d of %d objects within %d directories.", cos.lastOperation.String(),
-		cos.Successful, cos.ObjectCount, cos.folderCount)
+		cos.Successful, cos.ObjectCount, cos.FolderCount)
 	if cos.incomplete {
 		message += " " + cos.incompleteReason
 	}