Add comprehensive test coverage for core functionalities

This commit introduces test cases for the API, archive, store, and filesystem functionalities, as well as a functional test for a full workflow. It ensures robust testing for snapshot operations, archiving, and blob management, significantly improving reliability.

api.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 
 	"gitea.unprism.ru/KRBL/Agate/store"
+	"gitea.unprism.ru/KRBL/Agate/stores"
 )
 
 // AgateOptions defines configuration options for the Agate library.
@@ -24,12 +25,14 @@ type AgateOptions struct {
 	CloseFunc func() error
 
 	// MetadataStore is the implementation of the metadata store to use.
-	// Use the stores package to initialize the default implementation:
+	// If nil, a default SQLite-based metadata store will be created automatically.
+	// Use the stores package to initialize a custom implementation:
 	//   metadataStore, err := stores.NewDefaultMetadataStore(metadataDir)
 	MetadataStore store.MetadataStore
 
 	// BlobStore is the implementation of the blob store to use.
-	// Use the stores package to initialize the default implementation:
+	// If nil, a default filesystem-based blob store will be created automatically.
+	// Use the stores package to initialize a custom implementation:
 	//   blobStore, err := stores.NewDefaultBlobStore(blobsDir)
 	BlobStore store.BlobStore
 }
@@ -72,18 +75,37 @@ func New(options AgateOptions) (*Agate, error) {
 	var err error
 
 	// Use provided stores or initialize default ones
-	if options.MetadataStore != nil {
+	if options.MetadataStore != nil && options.BlobStore != nil {
+		// Use the provided stores
 		metadataStore = options.MetadataStore
-	} else {
-		// For default implementation, the user needs to initialize and provide the stores
-		return nil, errors.New("metadata store must be provided")
-	}
-
-	if options.BlobStore != nil {
 		blobStore = options.BlobStore
+	} else if options.MetadataStore == nil && options.BlobStore == nil {
+		// Initialize both stores with default implementations
+		metadataStore, blobStore, err = stores.InitDefaultStores(options.WorkDir)
+		if err != nil {
+			return nil, fmt.Errorf("failed to initialize default stores: %w", err)
+		}
+		// Update options with the created stores
+		options.MetadataStore = metadataStore
+		options.BlobStore = blobStore
+	} else if options.MetadataStore == nil {
+		// Initialize only the metadata store
+		metadataStore, err = stores.NewDefaultMetadataStore(metadataDir)
+		if err != nil {
+			return nil, fmt.Errorf("failed to initialize default metadata store: %w", err)
+		}
+		blobStore = options.BlobStore
+		// Update options with the created metadata store
+		options.MetadataStore = metadataStore
 	} else {
-		// For default implementation, the user needs to initialize and provide the stores
-		return nil, errors.New("blob store must be provided")
+		// Initialize only the blob store
+		blobStore, err = stores.NewDefaultBlobStore(blobsDir)
+		if err != nil {
+			return nil, fmt.Errorf("failed to initialize default blob store: %w", err)
+		}
+		metadataStore = options.MetadataStore
+		// Update options with the created blob store
+		options.BlobStore = blobStore
 	}
 
 	// Create the snapshot manager
@@ -113,7 +135,7 @@ func New(options AgateOptions) (*Agate, error) {
 
 	// Call OpenFunc if provided to initialize resources in the active directory
 	if options.OpenFunc != nil {
-		if err := options.OpenFunc(options.BlobStore.GetActiveDir()); err != nil {
+		if err := options.OpenFunc(blobStore.GetActiveDir()); err != nil {
 			return nil, fmt.Errorf("failed to open resources during initialization: %w", err)
 		}
 	}