diff --git a/config/fwvdp_test.go b/config/fwvdp_test.go
index fa20c4cd3..c985d3ff6 100644
--- a/config/fwvdp_test.go
+++ b/config/fwvdp_test.go
@@ -69,6 +69,12 @@ func TestFieldAsInterfaceFWV(t *testing.T) {
 	} else if !reflect.DeepEqual(expected, received) {
 		t.Errorf("Expected %+v, received %+v", expected, received)
 	}
+
+	if received, err := dp.FieldAsInterface(pth); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(expected, received) {
+		t.Errorf("Expected %+v, received %+v", expected, received)
+	}
 }
 
 func TestFieldAsInterfaceFWVEmptyPath(t *testing.T) {
@@ -93,3 +99,83 @@ func TestFieldAsInterfaceFWVInvalidPath(t *testing.T) {
 		t.Errorf("Expected %+v, received %+v", expected, err)
 	}
 }
+
+func TestFieldAsInterfaceFWVInvalidConvert1(t *testing.T) {
+	pth := []string{"1s-12"}
+	record := `"cgrates.org", "ATTR_1"`
+	dp := &FWVProvider{
+		req:   record,
+		cache: utils.MapStorage{},
+	}
+	expected := "strconv.Atoi: parsing \"1s\": invalid syntax"
+	if _, err := dp.FieldAsInterface(pth); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}
+
+func TestFieldAsInterfaceFWVInvalidConvert2(t *testing.T) {
+	pth := []string{"1-1s"}
+	record := `"cgrates.org", "ATTR_1"`
+	dp := &FWVProvider{
+		req:   record,
+		cache: utils.MapStorage{},
+	}
+	expected := "strconv.Atoi: parsing \"1s\": invalid syntax"
+	if _, err := dp.FieldAsInterface(pth); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}
+
+func TestFieldAsInterfaceFWVLowerLength(t *testing.T) {
+	pth := []string{"10-14"}
+	record := `"cgra"`
+	dp := &FWVProvider{
+		req:   record,
+		cache: utils.MapStorage{},
+	}
+	expected := "StartIndex : 10 is greater than : 6"
+	if _, err := dp.FieldAsInterface(pth); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}
+
+func TestFieldAsInterfaceFWVHigherLength(t *testing.T) {
+	pth := []string{"3-14"}
+	record := `"cgra"`
+	dp := &FWVProvider{
+		req:   record,
+		cache: utils.MapStorage{},
+	}
+	expected := "FinalIndex : 14 is greater than : 6"
+	if _, err := dp.FieldAsInterface(pth); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}
+
+func TestFieldAsStringFWV(t *testing.T) {
+	pth := []string{"1-12"}
+	record := `"cgrates.org", "ATTR_1"`
+	dp := &FWVProvider{
+		req:   record,
+		cache: utils.MapStorage{},
+	}
+	expected := "cgrates.org"
+	if received, err := dp.FieldAsString(pth); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(expected, received) {
+		t.Errorf("Expected %+v, received %+v", expected, received)
+	}
+}
+
+func TestFieldAsStringFWVError(t *testing.T) {
+	pth := []string{"112"}
+	record := `"cgrates.org", "ATTR_1"`
+	dp := &FWVProvider{
+		req:   record,
+		cache: utils.MapStorage{},
+	}
+	expected := "Invalid format for index : [112]"
+	if _, err := dp.FieldAsString(pth); err == nil || err.Error() != expected {
+		t.Errorf("Expected %+v, received %+v", expected, err)
+	}
+}