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.

remote/remote_test.go

@@ -0,0 +1,115 @@
+package remote
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"gitea.unprism.ru/KRBL/Agate/store"
+)
+
+// TestClientConnect tests that the client can connect to a server
+func TestClientConnect(t *testing.T) {
+	// Skip this test in short mode
+	if testing.Short() {
+		t.Skip("Skipping remote test in short mode")
+	}
+
+	// This test requires a running server
+	// For a real test, you would need to start a server
+	// Here we'll just test the client creation
+	_, err := NewClient("localhost:50051")
+	if err != nil {
+		// It's expected that this will fail if no server is running
+		t.Logf("Failed to connect to server: %v", err)
+	}
+}
+
+// TestMockClient tests the client functionality with a mock
+func TestMockClient(t *testing.T) {
+	// Create a mock client
+	client := &MockClient{}
+
+	// Test ListSnapshots
+	snapshots, err := client.ListSnapshots(context.Background())
+	if err != nil {
+		t.Fatalf("MockClient.ListSnapshots failed: %v", err)
+	}
+	if len(snapshots) != 1 {
+		t.Errorf("Expected 1 snapshot, got %d", len(snapshots))
+	}
+
+	// Test FetchSnapshotDetails
+	snapshot, err := client.FetchSnapshotDetails(context.Background(), "mock-snapshot-id")
+	if err != nil {
+		t.Fatalf("MockClient.FetchSnapshotDetails failed: %v", err)
+	}
+	if snapshot.ID != "mock-snapshot-id" {
+		t.Errorf("Expected snapshot ID 'mock-snapshot-id', got '%s'", snapshot.ID)
+	}
+
+	// Test DownloadSnapshot
+	tempDir, err := os.MkdirTemp("", "agate-mock-test-*")
+	if err != nil {
+		t.Fatalf("Failed to create temp directory: %v", err)
+	}
+	defer os.RemoveAll(tempDir)
+
+	err = client.DownloadSnapshot(context.Background(), "mock-snapshot-id", tempDir, "")
+	if err != nil {
+		t.Fatalf("MockClient.DownloadSnapshot failed: %v", err)
+	}
+
+	// Check that the mock file was created
+	mockFilePath := filepath.Join(tempDir, "mock-file.txt")
+	if _, err := os.Stat(mockFilePath); os.IsNotExist(err) {
+		t.Errorf("Mock file was not created")
+	}
+}
+
+// MockClient is a mock implementation of the Client for testing
+type MockClient struct{}
+
+// ListSnapshots returns a mock list of snapshots
+func (m *MockClient) ListSnapshots(ctx context.Context) ([]store.SnapshotInfo, error) {
+	return []store.SnapshotInfo{
+		{
+			ID:       "mock-snapshot-id",
+			Name:     "Mock Snapshot",
+			ParentID: "",
+		},
+	}, nil
+}
+
+// FetchSnapshotDetails returns mock snapshot details
+func (m *MockClient) FetchSnapshotDetails(ctx context.Context, snapshotID string) (*store.Snapshot, error) {
+	return &store.Snapshot{
+		ID:       snapshotID,
+		Name:     "Mock Snapshot",
+		ParentID: "",
+		Files: []store.FileInfo{
+			{
+				Path:   "mock-file.txt",
+				Size:   100,
+				IsDir:  false,
+				SHA256: "mock-hash",
+			},
+		},
+	}, nil
+}
+
+// DownloadSnapshot simulates downloading a snapshot
+func (m *MockClient) DownloadSnapshot(ctx context.Context, snapshotID string, targetDir string, localParentID string) error {
+	// Create a mock file
+	mockFilePath := filepath.Join(targetDir, "mock-file.txt")
+	if err := os.MkdirAll(filepath.Dir(mockFilePath), 0755); err != nil {
+		return err
+	}
+	return os.WriteFile(mockFilePath, []byte("Mock file content"), 0644)
+}
+
+// Close is a no-op for the mock client
+func (m *MockClient) Close() error {
+	return nil
+}