diff --git a/cores/server_test.go b/cores/server_test.go
index 660efff30..9e49ee14c 100644
--- a/cores/server_test.go
+++ b/cores/server_test.go
@@ -128,3 +128,19 @@ func TestHandleRequestCORSHeaders(t *testing.T) {
 		t.Errorf("Expected <%v>; got <%v>", expectedHeaders, got)
 	}
 }
+
+func TestRpcRequestWrite(t *testing.T) {
+	var buf bytes.Buffer
+	req := &rpcRequest{rw: &buf}
+	data := []byte("data, write!")
+	n, err := req.Write(data)
+	if err != nil {
+		t.Fatalf("Unexpected error during write: %v", err)
+	}
+	if n != len(data) {
+		t.Errorf("Expected %d bytes to be written, but got %d", len(data), n)
+	}
+	if buf.String() != string(data) {
+		t.Errorf("Expected buffer to contain %q, but got %q", data, buf.String())
+	}
+}
diff --git a/engine/storage_csv_test.go b/engine/storage_csv_test.go
new file mode 100644
index 000000000..db0628e95
--- /dev/null
+++ b/engine/storage_csv_test.go
@@ -0,0 +1,211 @@
+/*
+Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
+Copyright (C) ITsysCOM GmbH
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+package engine
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/cgrates/cgrates/utils"
+)
+
+func TestAppendName(t *testing.T) {
+	paths := []string{"/path/to/dir1", "/path/to/dir2"}
+	fileName := "file.csv"
+	expected := []string{"/path/to/dir1/file.csv", "/path/to/dir2/file.csv"}
+	result := appendName(paths, fileName)
+	if len(result) != len(expected) {
+		t.Errorf("TestAppendName (Multiple paths): Length mismatch. Expected %d, got %d", len(expected), len(result))
+	}
+	for i := range result {
+		if result[i] != expected[i] {
+			t.Errorf("TestAppendName (Multiple paths): Element %d mismatch. Expected %s, got %s", i, expected[i], result[i])
+		}
+	}
+	paths = []string{"/single/path"}
+	fileName = "single.csv"
+	expected = []string{"/single/path/single.csv"}
+	result = appendName(paths, fileName)
+	if len(result) != len(expected) {
+		t.Errorf("TestAppendName (Single path): Length mismatch. Expected %d, got %d", len(expected), len(result))
+	}
+	for i := range result {
+		if result[i] != expected[i] {
+			t.Errorf("TestAppendName (Single path): Element %d mismatch. Expected %s, got %s", i, expected[i], result[i])
+		}
+	}
+	paths = []string{}
+	fileName = "cdr.csv"
+	expected = []string{}
+	result = appendName(paths, fileName)
+	if len(result) != len(expected) {
+		t.Errorf("TestAppendName (Empty paths list): Length mismatch. Expected %d, got %d", len(expected), len(result))
+	}
+	for i := range result {
+		if result[i] != expected[i] {
+			t.Errorf("TestAppendName (Empty paths list): Element %d mismatch. Expected %s, got %s", i, expected[i], result[i])
+		}
+	}
+	paths = []string{"/path/to/dir1", "/path/to/dir2"}
+	fileName = "cdr.txt"
+	expected = []string{"/path/to/dir1/cdr.txt", "/path/to/dir2/cdr.txt"}
+	result = appendName(paths, fileName)
+	if len(result) != len(expected) {
+		t.Errorf("TestAppendName (Different file name): Length mismatch. Expected %d, got %d", len(expected), len(result))
+	}
+	for i := range result {
+		if result[i] != expected[i] {
+			t.Errorf("TestAppendName (Different file name): Element %d mismatch. Expected %s, got %s", i, expected[i], result[i])
+		}
+	}
+}
+
+func TestJoinURL(t *testing.T) {
+	baseURL := "http://cgrates.org/path"
+	fn := "file.txt"
+	expected := "http://cgrates.org/path/file.txt"
+	result := joinURL(baseURL, fn)
+	if result != expected {
+		t.Errorf("TestJoinURL (Valid URL): Expected %s, got %s", expected, result)
+	}
+	baseURL = "http://cgrates.org/path/"
+	fn = "file.txt"
+	expected = "http://cgrates.org/path/file.txt"
+	result = joinURL(baseURL, fn)
+	if result != expected {
+		t.Errorf("TestJoinURL (Trailing Slash): Expected %s, got %s", expected, result)
+	}
+	baseURL = "http://cgrates.org/path"
+	fn = "/file.txt"
+	expected = "http://cgrates.org/path/file.txt"
+	result = joinURL(baseURL, fn)
+	if result != expected {
+		t.Errorf("TestJoinURL (Leading Slash): Expected %s, got %s", expected, result)
+	}
+	baseURL = "http://cgrates.org"
+	fn = "file.txt"
+	expected = "http://cgrates.org/file.txt"
+	result = joinURL(baseURL, fn)
+	if result != expected {
+		t.Errorf("TestJoinURL (No Path): Expected %s, got %s", expected, result)
+	}
+	baseURL = "http://cgrates.org/path"
+	fn = "dir1/dir2/file.txt"
+	expected = "http://cgrates.org/path/dir1/dir2/file.txt"
+	result = joinURL(baseURL, fn)
+	if result != expected {
+		t.Errorf("TestJoinURL (Multiple Segments): Expected %s, got %s", expected, result)
+	}
+}
+
+func TestGetAllFolders(t *testing.T) {
+	baseDir := t.TempDir()
+	subDir1 := filepath.Join(baseDir, "subdir1")
+	subDir2 := filepath.Join(baseDir, "subdir2")
+	subSubDir := filepath.Join(subDir1, "subsubdir")
+	err := os.MkdirAll(subSubDir, 0755)
+	if err != nil {
+		t.Fatalf("Failed to create subdirectories: %v", err)
+	}
+	file, err := os.Create(filepath.Join(baseDir, "file.txt"))
+	if err != nil {
+		t.Fatalf("Failed to create test file: %v", err)
+	}
+	file.Close()
+	dirs, err := getAllFolders(baseDir)
+	if err != nil {
+		t.Fatalf("getAllFolders returned an error: %v", err)
+	}
+	for _, dir := range dirs {
+		if dir != baseDir && dir != subDir1 && dir != subDir2 && dir != subSubDir {
+			t.Errorf("Unexpected directory found in result: %s", dir)
+		}
+	}
+}
+
+func TestGetTpIds(t *testing.T) {
+	csvStorage := &CSVStorage{}
+	colName := "colName"
+	tpIds, err := csvStorage.GetTpIds(colName)
+	if err != utils.ErrNotImplemented {
+		t.Errorf("GetTpIds() returned error = %v, want %v", err, utils.ErrNotImplemented)
+	}
+	if tpIds != nil {
+		t.Errorf("GetTpIds() returned slice = %v, want nil", tpIds)
+	}
+}
+
+func TestStorageGetTpTableIds(t *testing.T) {
+	csvStorage := &CSVStorage{}
+	tpid := "Tpid"
+	table := "Table"
+	distinct := utils.TPDistinctIds{}
+	filters := map[string]string{"filterKey": "filterValue"}
+	paginator := &utils.PaginatorWithSearch{}
+	result, err := csvStorage.GetTpTableIds(tpid, table, distinct, filters, paginator)
+	if err != utils.ErrNotImplemented {
+		t.Errorf("GetTpTableIds() returned error = %v, want %v", err, utils.ErrNotImplemented)
+	}
+	if result != nil {
+		t.Errorf("GetTpTableIds() returned slice = %v, want nil", result)
+	}
+}
+
+func TestNewCsvFile(t *testing.T) {
+	csvReader := NewCsvFile()
+	_, ok := csvReader.(csvReaderCloser)
+	if !ok {
+		t.Errorf("NewCsvFile() did not return a type that implements csvReaderCloser interface")
+	}
+}
+
+func TestOpen(t *testing.T) {
+	tmpFile, err := os.CreateTemp("", "testfile-*.csv")
+	if err != nil {
+		t.Fatalf("Failed to create temporary file: %v", err)
+	}
+	defer os.Remove(tmpFile.Name())
+	testData := "col1,col2\nval1,val2"
+	if _, err := tmpFile.WriteString(testData); err != nil {
+		t.Fatalf("Failed to write to temporary file: %v", err)
+	}
+	if err := tmpFile.Close(); err != nil {
+		t.Fatalf("Failed to close temporary file: %v", err)
+	}
+	csvFile := &csvFile{}
+	if err := csvFile.Open(tmpFile.Name(), ',', 2); err != nil {
+		t.Fatalf("Open() failed: %v", err)
+	}
+	if csvFile.fp == nil {
+		t.Errorf("Expected non-nil file pointer, got nil")
+	}
+	if csvFile.csvReader == nil {
+		t.Errorf("Expected non-nil csvReader, got nil")
+	}
+	if csvFile.csvReader.Comma != ',' {
+		t.Errorf("Expected comma delimiter to be ',', got '%c'", csvFile.csvReader.Comma)
+	}
+	if csvFile.csvReader.FieldsPerRecord != 2 {
+		t.Errorf("Expected FieldsPerRecord to be 2, got %d", csvFile.csvReader.FieldsPerRecord)
+	}
+	if err := csvFile.fp.Close(); err != nil {
+		t.Errorf("Failed to close file: %v", err)
+	}
+}