diff --git a/engine/caches_test.go b/engine/caches_test.go
index 21b3b824d..95bbb091c 100644
--- a/engine/caches_test.go
+++ b/engine/caches_test.go
@@ -451,3 +451,59 @@ func TestCachetoStringSlice(t *testing.T) {
 		t.Error(slc)
 	}
 }
+
+func TestCacheSV1ReloadCacheErrors(t *testing.T) {
+	str := "test"
+	type args struct {
+		attrs utils.AttrReloadCacheWithArgDispatcher
+		reply *string
+	}
+
+	chS := CacheS{
+		cfg: &config.CGRConfig{},
+		dm: &DataManager{
+			cacheCfg: config.CacheCfg{},
+		},
+	}
+
+	tests := []struct {
+		name string
+		args args
+		err  string
+	}{
+		{
+			name: "FlushAll",
+			args: args{attrs: utils.AttrReloadCacheWithArgDispatcher{
+				&utils.ArgDispatcher{},
+				utils.TenantArg{},
+				utils.AttrReloadCache{
+					FlushAll: true,
+				},
+			}, reply: &str},
+			err: "",
+		},
+		{
+			name: "REload destination error",
+			args: args{attrs: utils.AttrReloadCacheWithArgDispatcher{
+				&utils.ArgDispatcher{},
+				utils.TenantArg{},
+				utils.AttrReloadCache{
+					FlushAll: true,
+				},
+			}, reply: &str},
+			err: "err",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := chS.V1ReloadCache(tt.args.attrs, tt.args.reply)
+
+			if err != nil {
+				if err.Error() != tt.err {
+					t.Error(err)
+				}
+			}
+		})
+	}
+}
diff --git a/engine/dispatcherprfl_test.go b/engine/dispatcherprfl_test.go
index b9f2d33cc..93ff1008d 100644
--- a/engine/dispatcherprfl_test.go
+++ b/engine/dispatcherprfl_test.go
@@ -267,3 +267,16 @@ func TestDispatcherprflClone(t *testing.T) {
 		t.Errorf("expected %v, received %v", dC, rcv)
 	}
 }
+
+func TestDispatcherprflCall(t *testing.T) {
+	dH := DispatcherHost{}
+
+	err := dH.Call("test", 1, 1)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if dH.rpcConn == nil {
+		t.Error(dH.Tenant)
+	}
+}
diff --git a/engine/eventcost_test.go b/engine/eventcost_test.go
index dc99a9725..7a4601fb7 100644
--- a/engine/eventcost_test.go
+++ b/engine/eventcost_test.go
@@ -3664,17 +3664,17 @@ func TestEventCostnewChargingIncrement(t *testing.T) {
 	e := EventCost{}
 
 	rcv := e.newChargingIncrement(&Increment{
-		Duration: 1 * time.Second,
-		Cost: 1, 
+		Duration:       1 * time.Second,
+		Cost:           1,
 		CompressFactor: 1,
 	}, RatingMatchedFilters{}, false)
 	exp := &ChargingIncrement{
-		Usage: 1 * time.Second,
-		Cost: 1, 
+		Usage:          1 * time.Second,
+		Cost:           1,
 		CompressFactor: 1,
 	}
 
 	if !reflect.DeepEqual(rcv, exp) {
 		t.Errorf("expected %v, received %v", exp, rcv)
 	}
-}
\ No newline at end of file
+}
diff --git a/engine/filters_test.go b/engine/filters_test.go
index 729e78e3b..ec5a90ff0 100644
--- a/engine/filters_test.go
+++ b/engine/filters_test.go
@@ -2992,3 +2992,151 @@ func TestFilterspassEqualTo(t *testing.T) {
 		t.Error("Recived:", rcv)
 	}
 }
+
+func TestFiltersNewFilterRule(t *testing.T) {
+	_, err := NewFilterRule("*rsr", "test", []string{"test)"})
+
+	if err != nil {
+		if err.Error() != "invalid RSRFilter start rule in string: <test)>" {
+			t.Error(err)
+		}
+	}
+}
+
+func TestFiltersgetFieldNameDataProvider(t *testing.T) {
+	fS := FilterS{}
+
+	type args struct {
+		initialDP utils.DataProvider
+		fieldName string
+		tenant    string
+	}
+
+	tests := []struct {
+		name string
+		args args
+		exp  utils.DataProvider
+		err  string
+	}{
+		{
+			name: "",
+			args: args{
+				initialDP: utils.MapStorage{},
+				fieldName: "~*accounts",
+				tenant:    "test",
+			},
+			exp: nil,
+			err: "invalid fieldname <~*accounts>",
+		},
+		{
+			name: "",
+			args: args{
+				initialDP: utils.MapStorage{},
+				fieldName: "~*resources",
+				tenant:    "test",
+			},
+			exp: nil,
+			err: "invalid fieldname <~*resources>",
+		},
+		{
+			name: "",
+			args: args{
+				initialDP: utils.MapStorage{},
+				fieldName: "~*stats",
+				tenant:    "test",
+			},
+			exp: nil,
+			err: "invalid fieldname <~*stats>",
+		},
+		{
+			name: "",
+			args: args{
+				initialDP: utils.MapStorage{},
+				fieldName: "test",
+				tenant:    "test",
+			},
+			exp: nil,
+			err: "filter path: <test> doesn't have a valid prefix",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			rcv, err := fS.getFieldNameDataProvider(tt.args.initialDP, tt.args.fieldName, tt.args.tenant)
+
+			if err != nil {
+				if err.Error() != tt.err {
+					t.Error(err)
+				}
+			}
+
+			if !reflect.DeepEqual(rcv, tt.exp) {
+				t.Errorf("expected %v, received %v", tt.exp, rcv)
+			}
+		})
+	}
+}
+
+func TestFiltersgetFieldValueDataProvider(t *testing.T) {
+	fS := FilterS{}
+
+	type args struct {
+		initialDP utils.DataProvider
+		fieldName string
+		tenant    string
+	}
+
+	tests := []struct {
+		name string
+		args args
+		exp  utils.DataProvider
+		err  string
+	}{
+		{
+			name: "",
+			args: args{
+				initialDP: utils.MapStorage{},
+				fieldName: "~*accounts",
+				tenant:    "test",
+			},
+			exp: nil,
+			err: "invalid fieldname <~*accounts>",
+		},
+		{
+			name: "",
+			args: args{
+				initialDP: utils.MapStorage{},
+				fieldName: "~*resources",
+				tenant:    "test",
+			},
+			exp: nil,
+			err: "invalid fieldname <~*resources>",
+		},
+		{
+			name: "",
+			args: args{
+				initialDP: utils.MapStorage{},
+				fieldName: "~*stats",
+				tenant:    "test",
+			},
+			exp: nil,
+			err: "invalid fieldname <~*stats>",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			rcv, err := fS.getFieldValueDataProvider(tt.args.initialDP, tt.args.fieldName, tt.args.tenant)
+
+			if err != nil {
+				if err.Error() != tt.err {
+					t.Error(err)
+				}
+			}
+
+			if !reflect.DeepEqual(rcv, tt.exp) {
+				t.Errorf("expected %v, received %v", tt.exp, rcv)
+			}
+		})
+	}
+}
diff --git a/engine/fscdr_test.go b/engine/fscdr_test.go
index fa38e1dad..65f00f1a5 100644
--- a/engine/fscdr_test.go
+++ b/engine/fscdr_test.go
@@ -534,3 +534,17 @@ func TestFsCdrFirstDefined(t *testing.T) {
 		t.Errorf("Expecting: 1001, received: %s", value)
 	}
 }
+
+func TestFSCdrNewFSCdr(t *testing.T) {
+	rcv, err := NewFSCdr([]byte{}, nil)
+
+	if err != nil {
+		if err.Error() != "unexpected end of JSON input" {
+			t.Error(err)
+		}
+	}
+
+	if rcv != nil {
+		t.Error(rcv)
+	}
+}
diff --git a/engine/thresholds_test.go b/engine/thresholds_test.go
index b098cb5af..7a7a2d67e 100644
--- a/engine/thresholds_test.go
+++ b/engine/thresholds_test.go
@@ -867,3 +867,88 @@ func TestThSProcessEventMaxHits(t *testing.T) {
 		t.Error(err)
 	}
 }
+
+func TestThresholdsProcessEvent3(t *testing.T) {
+	to := Threshold{
+		Snooze: time.Date(
+			2024, 11, 17, 20, 34, 58, 651387237, time.UTC),
+	}
+
+	err := to.ProcessEvent(nil, nil)
+
+	if err != nil {
+		t.Error(err)
+	}
+
+	to2 := Threshold{
+		Hits: 1,
+		tPrfl: &ThresholdProfile{
+			MinHits: 2,
+		},
+	}
+
+	err = to2.ProcessEvent(nil, nil)
+
+	if err != nil {
+		t.Error(err)
+	}
+
+	to3 := Threshold{
+		Hits: 2,
+		tPrfl: &ThresholdProfile{
+			MinHits: 2,
+			MaxHits: 1,
+		},
+	}
+
+	err = to3.ProcessEvent(nil, nil)
+
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestThresholdsStoreThreshold(t *testing.T) {
+	ts := ThresholdService{}
+
+	err := ts.StoreThreshold(&Threshold{})
+
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestThresholdsV1GetThresholdsForEvent(t *testing.T) {
+	tS := ThresholdService{}
+
+	err := tS.V1GetThresholdsForEvent(&ArgsProcessEvent{}, &Thresholds{})
+
+	if err != nil {
+		if err.Error() != "MANDATORY_IE_MISSING: [CGREvent]" {
+			t.Error(err)
+		}
+	}
+
+	err = tS.V1GetThresholdsForEvent(&ArgsProcessEvent{
+		CGREvent: &utils.CGREvent{},
+	}, &Thresholds{})
+
+	if err != nil {
+		if err.Error() != "MANDATORY_IE_MISSING: [Tenant ID]" {
+			t.Error(err)
+		}
+	}
+
+	err = tS.V1GetThresholdsForEvent(&ArgsProcessEvent{
+		CGREvent: &utils.CGREvent{
+			Tenant: "test",
+			ID:     "test",
+		},
+	}, &Thresholds{})
+
+	if err != nil {
+		if err.Error() != "MANDATORY_IE_MISSING: [Event]" {
+			t.Error(err)
+		}
+	}
+}