diff --git a/ers/filecsv_it_test.go b/ers/filecsv_it_test.go
index 7f8d17955..be1acced2 100644
--- a/ers/filecsv_it_test.go
+++ b/ers/filecsv_it_test.go
@@ -458,7 +458,7 @@ func TestFileCSVProcessEventError(t *testing.T) {
 	}
 }
 
-func TestFileCSV(t *testing.T) {
+func TestFileCSVDirErr(t *testing.T) {
 	cfg := config.NewDefaultCGRConfig()
 	fltrs := &engine.FilterS{}
 	eR := &CSVFileER{
@@ -477,6 +477,21 @@ func TestFileCSV(t *testing.T) {
 	if err := eR.Serve(); err == nil || err.Error() != errExpect {
 		t.Errorf("Expected %v but received %v", errExpect, err)
 	}
+}
+func TestFileCSV(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	fltrs := &engine.FilterS{}
+	eR := &CSVFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/ers/out/",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
+	}
+	eR.conReqs <- struct{}{}
 	filePath := "/tmp/ers/out/"
 	err := os.MkdirAll(filePath, 0777)
 	if err != nil {
@@ -491,6 +506,11 @@ func TestFileCSV(t *testing.T) {
 	if err := eR.Serve(); err != nil {
 		t.Error(err)
 	}
+	os.Create(path.Join(filePath, "file1.txt"))
+	eR.Config().RunDelay = 1 * time.Millisecond
+	if err := eR.Serve(); err != nil {
+		t.Error(err)
+	}
 }
 
 func TestFileCSVExit(t *testing.T) {
diff --git a/ers/filefwv_it_test.go b/ers/filefwv_it_test.go
index b68dfd6fd..166a67780 100644
--- a/ers/filefwv_it_test.go
+++ b/ers/filefwv_it_test.go
@@ -21,6 +21,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 package ers
 
 import (
+	"fmt"
 	"net/rpc"
 	"os"
 	"path"
@@ -268,3 +269,135 @@ func TestFWVFileConfig(t *testing.T) {
 		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", expected, result)
 	}
 }
+
+func TestFileFWVProcessEvent(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	cfg.ERsCfg().Readers[0].ProcessedPath = ""
+	fltrs := &engine.FilterS{}
+	filePath := "/tmp/TestFileFWVProcessEvent/"
+	if err := os.MkdirAll(filePath, 0777); err != nil {
+		t.Error(err)
+	}
+	file, err := os.Create(path.Join(filePath, "file1.fwv"))
+	if err != nil {
+		t.Error(err)
+	}
+	file.Write([]byte("test,test2"))
+	file.Close()
+	eR := &FWVFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/fwvErs/out",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
+	}
+	eR.conReqs <- struct{}{}
+	fname := "file1.fwv"
+	errExpect := "unsupported field prefix: <> when set fields"
+	eR.Config().Fields = []*config.FCTemplate{
+		{
+			Value: config.RSRParsers{
+				{
+					Rules: "~*hdr",
+				},
+			},
+			Type: utils.MetaRemove,
+			// Path: utils.MetaVars,
+		},
+	}
+	eR.Config().Fields[0].ComputePath()
+	if err := eR.processFile(filePath, fname); err == nil || err.Error() != errExpect {
+		t.Errorf("Expected %v but received %v", errExpect, err)
+	}
+	if err := os.RemoveAll(filePath); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestFileFWVServeErrTimeDuration0(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	cfgIdx := 0
+	rdr, err := NewFWVFileER(cfg, cfgIdx, nil, nil, nil, nil)
+	if err != nil {
+		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+	}
+	rdr.Config().RunDelay = time.Duration(0)
+	result := rdr.Serve()
+	if !reflect.DeepEqual(result, nil) {
+		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, result)
+	}
+}
+
+func TestFileFWVServeErrTimeDurationNeg1(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	cfgIdx := 0
+	rdr, err := NewFWVFileER(cfg, cfgIdx, nil, nil, nil, nil)
+	if err != nil {
+		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+	}
+	rdr.Config().RunDelay = time.Duration(-1)
+	expected := "no such file or directory"
+	err = rdr.Serve()
+	if err == nil || err.Error() != expected {
+		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", expected, err)
+	}
+}
+
+func TestFileFWV(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	fltrs := &engine.FilterS{}
+	eR := &FWVFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/fwvErs/out",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
+	}
+	eR.conReqs <- struct{}{}
+	filePath := "/tmp/fwvErs/out"
+	err := os.MkdirAll(filePath, 0777)
+	if err != nil {
+		t.Error(err)
+	}
+	for i := 1; i < 4; i++ {
+		if _, err := os.Create(path.Join(filePath, fmt.Sprintf("file%d.fwv", i))); err != nil {
+			t.Error(err)
+		}
+	}
+	eR.Config().RunDelay = 1 * time.Millisecond
+	if err := eR.Serve(); err != nil {
+		t.Error(err)
+	}
+	os.Create(path.Join(filePath, "file1.txt"))
+	eR.Config().RunDelay = 1 * time.Millisecond
+	if err := eR.Serve(); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestFileFWVExit(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	fltrs := &engine.FilterS{}
+	eR := &FWVFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/fwvErs/out",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
+	}
+	eR.conReqs <- struct{}{}
+	eR.Config().RunDelay = 1 * time.Millisecond
+	if err := eR.Serve(); err != nil {
+		t.Error(err)
+	}
+	eR.rdrExit <- struct{}{}
+}
diff --git a/ers/filejson_it_test.go b/ers/filejson_it_test.go
index 049918550..88b7ac1e5 100644
--- a/ers/filejson_it_test.go
+++ b/ers/filejson_it_test.go
@@ -21,9 +21,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 package ers
 
 import (
+	"encoding/json"
+	"fmt"
 	"net/rpc"
 	"os"
 	"path"
+	"reflect"
 	"testing"
 	"time"
 
@@ -226,7 +229,6 @@ func testJSONKillEngine(t *testing.T) {
 	}
 }
 
-/*
 func TestFileJSONServeErrTimeDuration0(t *testing.T) {
 	cfg := config.NewDefaultCGRConfig()
 	cfgIdx := 0
@@ -241,7 +243,6 @@ func TestFileJSONServeErrTimeDuration0(t *testing.T) {
 	}
 }
 
-
 func TestFileJSONServeErrTimeDurationNeg1(t *testing.T) {
 	cfg := config.NewDefaultCGRConfig()
 	cfgIdx := 0
@@ -257,47 +258,203 @@ func TestFileJSONServeErrTimeDurationNeg1(t *testing.T) {
 	}
 }
 
-func TestFileJSONServeTimeDefault(t *testing.T) {
+// func TestFileJSONServeTimeDefault(t *testing.T) {
+// 	cfg := config.NewDefaultCGRConfig()
+// 	cfgIdx := 0
+// 	rdr, err := NewJSONFileER(cfg, cfgIdx, nil, nil, nil, nil)
+// 	if err != nil {
+// 		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+// 	}
+// 	rdr.Config().RunDelay = time.Duration(1)
+// 	result := rdr.Serve()
+// 	if !reflect.DeepEqual(result, nil) {
+// 		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, result)
+// 	}
+// }
+
+// func TestFileJSONServeTimeDefaultChanExit(t *testing.T) {
+// 	cfg := config.NewDefaultCGRConfig()
+// 	cfgIdx := 0
+// 	rdrExit := make(chan struct{}, 1)
+// 	rdr, err := NewJSONFileER(cfg, cfgIdx, nil, nil, nil, rdrExit)
+// 	if err != nil {
+// 		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+// 	}
+// 	rdrExit <- struct{}{}
+// 	rdr.Config().RunDelay = time.Duration(1)
+// 	result := rdr.Serve()
+// 	if !reflect.DeepEqual(result, nil) {
+// 		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, result)
+// 	}
+// }
+
+// func TestFileJSONProcessFile(t *testing.T) {
+// 	cfg := config.NewDefaultCGRConfig()
+// 	cfgIdx := 0
+// 	rdr, err := NewJSONFileER(cfg, cfgIdx, nil, nil, nil, nil)
+// 	if err != nil {
+// 		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+// 	}
+// 	expected := "open : no such file or directory"
+// 	err2 := rdr.(*JSONFileER).processFile("", "")
+// 	if err2 == nil || err2.Error() != expected {
+// 		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", expected, err2)
+// 	}
+// }
+
+func TestFileJSONProcessEvent(t *testing.T) {
 	cfg := config.NewDefaultCGRConfig()
-	cfgIdx := 0
-	rdr, err := NewJSONFileER(cfg, cfgIdx, nil, nil, nil, nil)
-	if err != nil {
-		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+	cfg.ERsCfg().Readers[0].ProcessedPath = ""
+	fltrs := &engine.FilterS{}
+	filePath := "/tmp/TestFileJSONProcessEvent/"
+	if err := os.MkdirAll(filePath, 0777); err != nil {
+		t.Error(err)
 	}
-	rdr.Config().RunDelay = time.Duration(1)
-	result := rdr.Serve()
-	if !reflect.DeepEqual(result, nil) {
-		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, result)
+	file, err := os.Create(path.Join(filePath, "file1.json"))
+	if err != nil {
+		t.Error(err)
+	}
+	fcTemp := map[string]interface{}{
+		"2":  "tor_test",
+		"3":  "originid_test",
+		"4":  "requestType_test",
+		"6":  "tenant_test",
+		"7":  "category_test",
+		"8":  "account_test",
+		"9":  "subject_test",
+		"10": "destination_test",
+		"11": "setupTime_test",
+		"12": "answerTime_test",
+		"13": "usage_test",
+	}
+	rcv, err := json.Marshal(fcTemp)
+	if err != nil {
+		t.Error(err)
+	}
+	file.Write([]byte(rcv))
+	file.Close()
+	eR := &JSONFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/ErsJSON/out/",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
+	}
+	expEvent := &utils.CGREvent{
+		Tenant: "cgrates.org",
+		Event: map[string]interface{}{
+			utils.AccountField: "account_test",
+			utils.AnswerTime:   "answerTime_test",
+			utils.Category:     "category_test",
+			utils.Destination:  "destination_test",
+			utils.OriginID:     "originid_test",
+			utils.RequestType:  "requestType_test",
+			utils.SetupTime:    "setupTime_test",
+			utils.Subject:      "subject_test",
+			utils.Tenant:       "tenant_test",
+			utils.ToR:          "tor_test",
+			utils.Usage:        "usage_test",
+		},
+		APIOpts: map[string]interface{}{},
+	}
+	// expEvent := &utils.CGREvent{}
+	eR.conReqs <- struct{}{}
+	fname := "file1.json"
+	if err := eR.processFile(filePath, fname); err != nil {
+		t.Error(err)
+	}
+	select {
+	case data := <-eR.rdrEvents:
+		expEvent.ID = data.cgrEvent.ID
+		expEvent.Time = data.cgrEvent.Time
+		if !reflect.DeepEqual(data.cgrEvent, expEvent) {
+			t.Errorf("Expected %v but received %v", utils.ToJSON(expEvent), utils.ToJSON(data.cgrEvent))
+		}
+	case <-time.After(50 * time.Millisecond):
+		t.Error("Time limit exceeded")
+	}
+	if err := os.RemoveAll(filePath); err != nil {
+		t.Error(err)
 	}
 }
 
-func TestFileJSONServeTimeDefaultChanExit(t *testing.T) {
+func TestFileJSONProcessEventReadError(t *testing.T) {
 	cfg := config.NewDefaultCGRConfig()
-	cfgIdx := 0
-	rdrExit := make(chan struct{}, 1)
-	rdr, err := NewJSONFileER(cfg, cfgIdx, nil, nil, nil, rdrExit)
-	if err != nil {
-		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+	fltrs := &engine.FilterS{}
+	filePath := "/tmp/TestFileJSONProcessEvent/"
+	fname := "file2.json"
+	eR := &CSVFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/ErsJSON/out/",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
 	}
-	rdrExit <- struct{}{}
-	rdr.Config().RunDelay = time.Duration(1)
-	result := rdr.Serve()
-	if !reflect.DeepEqual(result, nil) {
-		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, result)
+	eR.conReqs <- struct{}{}
+	errExpect := "open /tmp/TestFileJSONProcessEvent/file2.json: no such file or directory"
+	if err := eR.processFile(filePath, fname); err == nil || err.Error() != errExpect {
+		t.Errorf("Expected %v but received %v", errExpect, err)
 	}
 }
 
-func TestFileJSONProcessFile(t *testing.T) {
+func TestFileJSON(t *testing.T) {
 	cfg := config.NewDefaultCGRConfig()
-	cfgIdx := 0
-	rdr, err := NewJSONFileER(cfg, cfgIdx, nil, nil, nil, nil)
-	if err != nil {
-		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", nil, err)
+	fltrs := &engine.FilterS{}
+	eR := &JSONFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/ErsJSON/out/",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
 	}
-	expected := "open : no such file or directory"
-	err2 := rdr.(*JSONFileER).processFile("", "")
-	if err2 == nil || err2.Error() != expected {
-		t.Errorf("\nExpected <%+v>, \nReceived <%+v>", expected, err2)
+	eR.conReqs <- struct{}{}
+	filePath := "/tmp/ErsJSON/out/"
+	err := os.MkdirAll(filePath, 0777)
+	if err != nil {
+		t.Error(err)
+	}
+	for i := 1; i < 4; i++ {
+		if _, err := os.Create(path.Join(filePath, fmt.Sprintf("file%d.json", i))); err != nil {
+			t.Error(err)
+		}
+	}
+	eR.Config().RunDelay = 1 * time.Millisecond
+	if err := eR.Serve(); err != nil {
+		t.Error(err)
+	}
+	os.Create(path.Join(filePath, "file1.txt"))
+	eR.Config().RunDelay = 1 * time.Millisecond
+	if err := eR.Serve(); err != nil {
+		t.Error(err)
 	}
 }
-*/
+
+func TestFileJSONExit(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	fltrs := &engine.FilterS{}
+	eR := &JSONFileER{
+		cgrCfg:    cfg,
+		cfgIdx:    0,
+		fltrS:     fltrs,
+		rdrDir:    "/tmp/ErsJSON/out/",
+		rdrEvents: make(chan *erEvent, 1),
+		rdrError:  make(chan error, 1),
+		rdrExit:   make(chan struct{}),
+		conReqs:   make(chan struct{}, 1),
+	}
+	eR.conReqs <- struct{}{}
+	eR.Config().RunDelay = 1 * time.Millisecond
+	if err := eR.Serve(); err != nil {
+		t.Error(err)
+	}
+	eR.rdrExit <- struct{}{}
+}
diff --git a/ers/sql.go b/ers/sql.go
index f00db6b7e..3a3ff80ff 100644
--- a/ers/sql.go
+++ b/ers/sql.go
@@ -96,6 +96,23 @@ func (rdr *SQLEventReader) Config() *config.EventReaderCfg {
 	return rdr.cgrCfg.ERsCfg().Readers[rdr.cfgIdx]
 }
 
+func (rdr *SQLEventReader) openDB(dialect gorm.Dialector) (err error) {
+	var db *gorm.DB
+	if db, err = gorm.Open(dialect, &gorm.Config{AllowGlobalUpdate: true}); err != nil {
+		return
+	}
+	var sqlDB *sql.DB
+	if sqlDB, err = db.DB(); err != nil {
+		return
+	}
+	sqlDB.SetMaxOpenConns(10)
+	if rdr.Config().RunDelay == time.Duration(0) { // 0 disables the automatic read, maybe done per API
+		return
+	}
+	go rdr.readLoop(db, sqlDB) // read until the connection is closed
+	return
+}
+
 // Serve will start the gorutines needed to watch the sql topic
 func (rdr *SQLEventReader) Serve() (err error) {
 	var dialect gorm.Dialector
@@ -107,22 +124,7 @@ func (rdr *SQLEventReader) Serve() (err error) {
 	default:
 		return fmt.Errorf("db type <%s> not supported", rdr.connType)
 	}
-	var db *gorm.DB
-	if db, err = gorm.Open(dialect, &gorm.Config{AllowGlobalUpdate: true}); err != nil {
-		return
-	}
-	var sqlDB *sql.DB
-	if sqlDB, err = db.DB(); err != nil {
-		return
-	}
-	sqlDB.SetMaxOpenConns(10)
-	if err = sqlDB.Ping(); err != nil {
-		return
-	}
-	if rdr.Config().RunDelay == time.Duration(0) { // 0 disables the automatic read, maybe done per API
-		return
-	}
-	go rdr.readLoop(db, sqlDB) // read until the connection is closed
+	err = rdr.openDB(dialect)
 	return
 }
 
diff --git a/ers/sql_it_test.go b/ers/sql_it_test.go
index 2dd04192e..3b399fb45 100644
--- a/ers/sql_it_test.go
+++ b/ers/sql_it_test.go
@@ -31,7 +31,9 @@ import (
 	"github.com/cgrates/cgrates/utils"
 	"gorm.io/driver/mysql"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 	"gorm.io/gorm/logger"
+	"gorm.io/gorm/schema"
 )
 
 var (
@@ -688,3 +690,72 @@ func TestErsSqlPostCDRS(t *testing.T) {
 	}
 	logger.Default = tmp
 }
+
+// type mockDialector interface {
+// 	Name() string
+// 	Initialize(*gorm.DB) error
+// 	Migrator(db *gorm.DB) gorm.Migrator
+// 	DataTypeOf(*schema.Field) string
+// 	DefaultValueOf(*schema.Field) clause.Expression
+// 	BindVarTo(writer clause.Writer, stmt *Statement, v interface{})
+// 	QuoteTo(clause.Writer, string)
+// 	Explain(sql string, vars ...interface{}) string
+// }
+type mockDialect struct{}
+
+func (mockDialect) Name() string                                                        { return "" }
+func (mockDialect) Initialize(db *gorm.DB) error                                        { return nil }
+func (mockDialect) Migrator(db *gorm.DB) gorm.Migrator                                  { return nil }
+func (mockDialect) DataTypeOf(*schema.Field) string                                     { return "" }
+func (mockDialect) DefaultValueOf(*schema.Field) clause.Expression                      { return nil }
+func (mockDialect) BindVarTo(writer clause.Writer, stmt *gorm.Statement, v interface{}) { return }
+func (mockDialect) QuoteTo(clause.Writer, string)                                       { return }
+func (mockDialect) Explain(sql string, vars ...interface{}) string                      { return "" }
+
+func TestMockOpenDB(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	sqlRdr := &SQLEventReader{
+		cgrCfg:        cfg,
+		cfgIdx:        0,
+		fltrS:         &engine.FilterS{},
+		connString:    "cgrates:CGRateS.org@tcp(127.0.0.1:3306)/cgrates?charset=utf8&loc=Local&parseTime=true&sql_mode='ALLOW_INVALID_DATES'",
+		connType:      utils.MySQL,
+		tableName:     "testName",
+		expConnString: "",
+		expConnType:   utils.Postgres,
+		expTableName:  "",
+		rdrEvents:     nil,
+		rdrExit:       nil,
+		rdrErr:        nil,
+		cap:           nil,
+	}
+	var mckDlct mockDialect
+	errExpect := "invalid db"
+	if err := sqlRdr.openDB(mckDlct); err == nil || err.Error() != errExpect {
+		t.Errorf("Expected %v but received %v", errExpect, err)
+	}
+}
+
+func TestSQLServeErr1(t *testing.T) {
+	cfg := config.NewDefaultCGRConfig()
+	sqlRdr := &SQLEventReader{
+		cgrCfg:        cfg,
+		cfgIdx:        0,
+		fltrS:         &engine.FilterS{},
+		connString:    "cgrates:CGRateS.org@tcp(127.0.0.1:3306)/cgrates?charset=utf8&loc=Local&parseTime=true&sql_mode='ALLOW_INVALID_DATES'",
+		connType:      utils.MySQL,
+		tableName:     "testName",
+		expConnString: "",
+		expConnType:   utils.Postgres,
+		expTableName:  "",
+		rdrEvents:     nil,
+		rdrExit:       nil,
+		rdrErr:        nil,
+		cap:           nil,
+	}
+	cfg.StorDbCfg().Password = "CGRateS.org"
+	sqlRdr.Config().RunDelay = time.Duration(0)
+	if err := sqlRdr.Serve(); err != nil {
+		t.Error(err)
+	}
+}