test: improve test infrastructure and fix integration tests

- Add folder to library before scanning in fsnotify integration test
- Update API endpoint paths from /items to /media-items
- Refactor test server setup to support WebSocket hijacking
- Add JobsHandler to test server configuration
- Implement proper job status polling instead of fixed delays
- Consolidate addFolderToLibrary helper into test_helpers.go
- Remove duplicate helper function from media_item_isbn_test.go
- Add error logging for search test failures
- Improve test robustness with better nil handling and type assertions
- Update worker test to use EnqueueJob and poll for completion
- Add global worker instance reset in test cleanup
- Fix media_scanner_test to initialize folders before testing

cmd/server/tests/search_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"encoding/json"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -373,6 +374,10 @@ func TestCollectionSearchLibraryFilter(t *testing.T) {
 	lib1Resp := createLibrary(t, client, setup, "Library 1 - Search Test")
 	lib2Resp := createLibrary(t, client, setup, "Library 2 - Search Test")
 
+	// Add folders to libraries (required before adding media items)
+	addFolderToLibrary(t, setup, lib1Resp["id"].(string), "/app/uploads")
+	addFolderToLibrary(t, setup, lib2Resp["id"].(string), "/app/uploads")
+
 	// Add books to each library
 	book1ID := createTestMediaItemIDInLibrary(t, client, setup, lib1Resp["id"].(string), "Harry Potter 1")
 	book2ID := createTestMediaItemIDInLibrary(t, client, setup, lib2Resp["id"].(string), "Harry Potter 2")
@@ -427,6 +432,12 @@ func TestCollectionSearchLibraryFilter(t *testing.T) {
 			require.NoError(t, err)
 			defer resp.Body.Close()
 
+			// Log response for debugging
+			if resp.StatusCode != http.StatusOK {
+				bodyBytes, _ := io.ReadAll(resp.Body)
+				t.Logf("ERROR %d: %s", resp.StatusCode, string(bodyBytes))
+			}
+
 			var result []map[string]interface{}
 			json.NewDecoder(resp.Body).Decode(&result)